@article {2431, title = {Detection and classification of cracking via acoustic emission during laser-melting screening for additive manufacturing}, journal = {JOM (1989)}, volume = {77}, year = {2025}, pages = {7274{\textendash}7286}, author = {Raeker, Evan B and Tulshibagwale, Nikhil and Mullin, Kaitlyn M and Lamb, James D and Pollock, Tresa M} } @unpublished {2406, title = {Mining multimodal fatigue data using reasoning foundation models and formalized domain knowledge}, year = {2025}, abstract = {

The scarcity and expense of fatigue data limits optimal design of components and constrains companies to a few well qualified materials when safety-critical applications are concerned. This research investigates different strategies to improve extraction of structured information from unstructured scientific literature\–-to date the largest corpus of fatigue information. Successful generative extraction is within reach considering latest foundation vision and reasoning language model (VLM/RLM) developments. In this work, a schema-based extraction is attempted for which an object-oriented fatigue data schema is designed. The schema provides labels, definitions and type-constraints for the target entities as contextual domain knowledge to the VLM/RLM model. The importance of nuanced target field definitions within the schema and constrained decoding is explored. Furthermore, the schema-based approach is gradually extended to form two agentic language model systems, one which utilizes a step-wise, human-inspired approach to first determine discriminative cues from fatigue S-N diagrams and one further applying dynamic knowledge augmentation. The latter dynamic workflow exploits the synergy of reasoning language models and ontologies by performing logical reasoning and web-search for dynamic knowledge augmentation and hallucination detection. On this rather complex fatigue data extraction task, requiring hierarchical pattern recognition and multimodal extraction, an overall F1-score of 0.82 is achieved, while fields contained in the narrative text modality are extracted with an F1-score of 0.92. The strengths and weaknesses of all models and methodologies are thoroughly discussed and extensions to our workflows are proposed.

}, author = {Mohanty, Jyoti Prakash and Thomas, Akhil and Pollock, Tresa M and Durmaz, Ali Riza} } @article {2376, title = {Non-destructive evaluation of bulk metallic glass components using resonance ultrasound spectroscopy}, journal = {Appl. Mater. Today}, volume = {42}, year = {2025}, pages = {102529}, author = {Kube, Sebastian A and Bordeenithikasem, Punnathat and Ziemke, Patrick and Lamb, James and Rossin, Jeff and Torbet, Chris and Begley, Matthew R and Dillon, R Peter and Pollock, Tresa M} } @article {2391, title = {Orientation-Adaptive Virtual Imaging of Defects using EBSD}, year = {2025}, abstract = {

EBSD is a foundational technique for characterizing crystallographic orientation, phase distribution, and lattice strain. Embedded within EBSD patterns lies latent information on dislocation structures, subtly encoded due to their deviation from perfect crystallinity - a feature often underutilized. Here, a novel framework termed orientation-adaptive virtual apertures (OAVA) is introduced. OAVAs enable the generation of virtual images tied to specific diffraction conditions, allowing the direct visualization of individual dislocations from a single EBSD map. By dynamically aligning virtual apertures in reciprocal space with the local crystallographic orientation, the method enhances contrast from defect-related strain fields, mirroring the principles of diffraction-contrast imaging in TEM, but without sample tilting. The approach capitalizes on the extensive diffraction space captured in a single high-quality EBSD scan, with its effectiveness enhanced by modern direct electron detectors that offer high-sensitivity at low accelerating voltages, reducing interaction volume and improving spatial resolution. We demonstrate that using OAVAs, identical imaging conditions can be applied across a polycrystalline field-of-view, enabling uniform contrast in differently oriented grains. Furthermore, in single-crystal GaN, threading dislocations are consistently resolved. Algorithms for the automated detection of dislocation contrast are presented, advancing defect characterization. By using OAVAs across a wide range of diffraction conditions in GaN, the visibility/invisibility of defects, owing to the anisotropy of the elastic strain field, is assessed and linked to candidate Burgers vectors. Altogether, OAVA offers a new and high-throughput pathway for orientation-specific defect characterization with the potential for automated, large-area defect analysis in single and polycrystalline materials.

}, author = {Della Ventura, Nicol{\`o} M and Lamb, James D and Lenthe, William C and Echlin, McLean P and P{\"u}rstl, Julia T and Trageser, Emily S and Quevedo, Alejandro M and Begley, Matthew R and Pollock, Tresa M and Gianola, Daniel S and De Graef, Marc} } @article {2401, title = {Very high cycle fatigue behavior of BCC refractory alloy C103}, journal = {Int. J. Fatigue}, year = {2025}, pages = {109139}, author = {Vailhe, Madeline and Torbet, Chris J and Mignerot, Florent and Pollock, Tresa M} } @article {1881, title = {Morphological Stability of Solid-Liquid Interfaces Under Additive Manufacturing Conditions}, journal = {Acta Materialia}, volume = {250}, year = {2023}, month = {03}, pages = {118858}, doi = {10.1016/j.actamat.2023.118858}, author = {Tourret, Damien and Klemm-Toole, Jonah and Eres-Castellanos, Adriana and Rodgers, Brian and Becker, Gus and Saville, Alec and Ellyson, Ben and Johnson, Chloe and Milligan, Brian and Copley, John and Ochoa, Ruben and Polonsky, Andrew and Pusch, Kira and Haines, Michael and Fezzaa, Kamel and Sun, Tao and Clarke, Kester and Babu, Suresh and Pollock, Tresa and Clarke, Amy} } @article {1901, title = {Nondestructive quantification of single crystal elasticity for additively manufactured SB-CoNi-10C, IN625, and Ti64}, journal = {NDT \& E International}, volume = {135}, year = {2023}, month = {02}, pages = {102803}, doi = {10.1016/j.ndteint.2023.102803}, author = {Rossin, Jeff and Leser, Patrick and Benzing, Jake and Torbet, Chris and Dillon, Robert and Smith, Stephen and Daly, Samantha and Pollock, Tresa} } @article {1851, title = {Perspective: Machine learning in experimental solid mechanics}, journal = {Journal of the Mechanics and Physics of Solids}, volume = {173}, year = {2023}, month = {04}, pages = {105231}, doi = {10.1016/j.jmps.2023.105231}, author = {Brodnik, N.R. and Muir, C. and Tulshibagwale, N. and Rossin, J. and Echlin, M.P. and Hamel, C.M. and Kramer, S.L.B. and Pollock, T.m. and Kiser, J.D. and Smith, C. and Daly, S.H.} } @article {1891, title = {Quantitative Benchmarking of Acoustic Emission Machine Learning Frameworks for Damage Mechanism Identification}, journal = {Integrating Materials and Manufacturing Innovation}, year = {2023}, month = {02}, pages = {1-12}, doi = {10.1007/s40192-023-00293-8}, author = {Muir, C. and Tulshibagwale, N. and Furst, A. and Swaminathan, B. and Almansour, Amjad and Sevener, Kathleen and Presby, Michael and Kiser, J. and Pollock, T. and Daly, S. and Smith, C.} } @article {1971, title = {Merging Machine Learning and TriBeam Tomography for 3D Defect Detection in an AM CoNi-Based Superalloy}, journal = {Microscopy and Microanalysis}, volume = {28}, year = {2022}, month = {08}, pages = {862-863}, doi = {10.1017/S1431927622003828}, author = {Lamb, James and Echlin, Mclean and Polonsky, Andrew and Geurts, Remco and Pusch, Kira and Raeker, Evan and Botman, Aurelien and Torbet, Chris and Pollock, Tresa} } @article {1996, title = {Microstructure Evolution and Tensile Properties of a Selectively Laser Melted CoNi-Base Superalloy}, journal = {Metallurgical and Materials Transactions A}, volume = {53}, year = {2022}, month = {05}, doi = {10.1007/s11661-022-06716-z}, author = {Murray, Sean and Raeker, Evan and Pusch, Kira and Frey, Carolina and Torbet, Chris and Zhou, Ning and Forsik, St{\'e}phane and Dicus, Austin and Colombo, Gian and Kirka, M. and Pollock, Tresa} } @article {1966, title = {Multi-modal Dataset of a Polycrystalline Metallic Material: 3D Microstructure and Deformation Fields}, journal = {Scientific Data}, volume = {9}, year = {2022}, month = {08}, doi = {10.1038/s41597-022-01525-w}, author = {Stinville, Jean-Charles and Hestroffer, Jonathan and Charpagne, Marie-agathe and Polonsky, Andrew and Echlin, M. and Torbet, Chris and Valle, Valery and Nygren, K. and Miller, M. and Klaas, Ottmar and Loghin, Adrian and Beyerlein, I. and Pollock, T.} } @article {1976, title = {Observations of Damage, Defects, and Structuring in Femtosecond Laser Ablated Surfaces}, journal = {Microscopy and Microanalysis}, volume = {28}, year = {2022}, month = {08}, pages = {872-873}, doi = {10.1017/S1431927622003865}, author = {Echlin, Mclean and Polonsky, Andrew and Lenthe, Will and Titus, Mike and Geurts, Remco and Botman, Aurelien and Straw, Marcus and Gumbsch, Peter and Pollock, Tresa} } @article {1811, title = {Single crystal elastic constants of additively manufactured components determined by resonant ultrasound spectroscopy}, journal = {Materials Characterization}, volume = {192}, year = {2022}, pages = {112244}, abstract = {

Bayesian inference with Sequential Monte Carlo was used to determine the single crystal elastic constants of additively manufactured (AM) cobalt-nickel-based superalloy specimens from only the resonant frequencies and texture data. This novel framework enables the quantification of the single crystal elastic constants for AM and polycrystalline specimens using only electron backscatter diffraction (EBSD) and Resonant Ultrasound Spectroscopy (RUS), avoiding the expense of bulk single crystal fabrication or synchrotron experiments. A parallelizable and open-source Python package (SMCPy) was used to perform Bayesian inference of the single crystal elastic constants from resonant frequencies of AM specimens. The single crystal elastic constants determined from AM cobalt-nickel-base superalloy specimens were validated with measurements of the single crystal elastic constants on a bulk single crystal specimen. EBSD texture data was used to determine the single crystal elastic constants from the resonant frequencies of AM specimens, and validated with neutron diffraction data by considering the experimental uncertainty in both the EBSD and neutron diffraction data. The robustness of this framework for varied texture orientations relative to the build direction (BD) was demonstrated for AM specimens printed at 0\° and 20\° BD-inclinations.

}, issn = {1044-5803}, doi = {https://doi.org/10.1016/j.matchar.2022.112244}, url = {https://www.sciencedirect.com/science/article/pii/S1044580322005265}, author = {Jeff Rossin and Patrick Leser and Kira Pusch and Carolina Frey and Sven C. Vogel and Alec I. Saville and Chris Torbet and Amy J. Clarke and Samantha Daly and Tresa M. Pollock} } @article {1741, title = {Bayesian inference of elastic constants and texture coefficients in additively manufactured cobalt-nickel superalloys using resonant ultrasound spectroscopy}, journal = {Acta Materialia}, volume = {220}, year = {2021}, pages = {117287}, abstract = {

Bayesian inference with sequential Monte Carlo is used to quantify the orientation distribution function coefficients and to calculate the fully anisotropic elastic constants of additively manufactured specimens from only the experimentally-measured resonant frequencies. The parallelizable and open-source SMCPy Python package enabled Bayesian inference within this new modeling framework, resulting in an order of magnitude reduction of the computation time for an 8-core machine. Residual stress-induced shifts on the resonant frequencies were explicitly accounted for during the Bayesian inference, enabling the estimation of their effect on the resonant frequencies without a stress-relief heat treatment. Additively manufactured cobalt-nickel-base superalloy (SB-CoNi-10C) specimens were sectioned at multiple inclinations relative to the build direction and scanned with resonant ultrasound spectroscopy to demonstrate characterization of any arbitrarily textured cubic microstructure through the resonant frequencies. The orientation distribution function coefficients of the textured polycrystalline microstructure were estimated in tensorial form to calculate both the 2nd order Hashin-Shtrikman bounds and the self-consistent estimate of the elastic constants, enabling accurate determination of all 21 possible independent elastic constants through the convergence constraints of the texture. Pole figures generated directly from the calculated texture coefficients showed good agreement with experimentally measured textures.

}, keywords = {Additive manufacturing, Bayesian inference, Parallel computing, Residual stress, Resonance ultrasound spectroscopy, Sequential monte carlo, Texture characterization}, issn = {1359-6454}, doi = {https://doi.org/10.1016/j.actamat.2021.117287}, url = {https://www.sciencedirect.com/science/article/pii/S1359645421006674}, author = {Jeff Rossin and Patrick Leser and Kira Pusch and Carolina Frey and Sean P. Murray and Chris J. Torbet and Stephen Smith and Samantha Daly and Tresa M. Pollock} } @article {2081, title = {Crack initiation anisotropy of Ni-based SX superalloys in the very high cycle fatigue regime}, journal = {Materials Science and Engineering: A}, volume = {825}, year = {2021}, month = {08}, pages = {141920}, doi = {10.1016/j.msea.2021.141920}, author = {Cervellon, Alice and Torbet, Chris and Pollock, Tresa} } @article {1686, title = {Electron backscattered diffraction using a new monolithic direct detector: High resolution and fast acquisition}, journal = {Ultramicroscopy}, volume = {220}, year = {2021}, pages = {113160}, abstract = {

A monolithic active pixel sensor based direct detector that is optimized for the primary beam energies in scanning electron microscopes is implemented for electron back-scattered diffraction (EBSD) applications. The high detection efficiency of the detector and its large array of pixels allow sensitive and accurate detection of Kikuchi bands arising from primary electron beam excitation energies of 4 keV to 28 keV, with the optimal contrast occurring in the range of 8\–16 keV. The diffraction pattern acquisition speed is substantially improved via a sparse sampling mode, resulting from the acquisition of a reduced number of pixels on the detector. Standard inpainting algorithms are implemented to effectively estimate the information in the skipped regions in the acquired diffraction pattern. For EBSD mapping, an acquisition speed as high as 5988 scan points per second is demonstrated, with a tolerable fraction of indexed points and accuracy. The collective capabilities spanning from high angular resolution EBSD patterns to high speed pattern acquisition are achieved on the same detector, facilitating simultaneous detection modalities that enable a multitude of advanced EBSD applications, including lattice strain mapping, structural refinement, low-dose characterization, 3D-EBSD and dynamic in situ EBSD.

}, keywords = {Direct detection, EBSD, Indexing, Inpainting, SEM, Sparse sampling}, issn = {18792723}, doi = {10.1016/j.ultramic.2020.113160}, url = {https://doi.org/10.1016/j.ultramic.2020.113160}, author = {Wang, Fulin and Echlin, Mclean P. and Taylor, Aidan A. and Shin, Jungho and Bammes, Benjamin and Levin, Barnaby D.A. and De Graef, Marc and Pollock, Tresa M. and Gianola, Daniel S.} } @article {2106, title = {Slip localization in Inconel 718: A three-dimensional and statistical perspective}, journal = {Acta Materialia}, volume = {215}, year = {2021}, month = {06}, pages = {117037}, doi = {10.1016/j.actamat.2021.117037}, author = {Charpagne, Marie-agathe and Hestroffer, Jonathan and Polonsky, Andrew and Echlin, M.P. and Texier, Damien and Valle, Valery and Beyerlein, I.J. and Pollock, T.m. and Stinville, Jean-Charles} } @article {1671, title = {Temperature dependence of single crystal elastic constants in a CoNi-Base alloy: A new methodology}, journal = {Materials Science and Engineering A}, volume = {803}, year = {2021}, pages = {140507}, abstract = {

A novel experimental setup combining induction heating, contactless (infrared thermometer) temperature measurements, and custom 15 cm length SiC-tipped piezoelectric transducers has been developed to rapidly collect resonant ultrasound spectroscopy (RUS) data from metallic rectangular parallelepiped (RP) specimens heated in air. This setup is used to collect over 70 of the lowest-frequency resonance modes from a single crystal of the novel CoNi-based superalloy SB-CoNi-10+\—an alloy identified for further study due to a promising set of high temperature properties. RUS spectra from room temperature (RT) to 927 \°C (1200 K) along with dilatometry measurements of the thermal expansion behavior are supplied to a robust, open-sourced, Bayesian inference code for simultaneous estimation of: three single crystal elastic constants, three crystal axis misorientation parameters, and a noise parameter. This study is the first application of the Bayesian RUS methodology at elevated temperatures, and the first to characterize SB-CoNi-10+. A monotonic decrease in elastic constants (C11,C12,C44) from (236.4, 150.8, 134.1) GPa to (190.7, 138.1, 95.2) GPa and a 15\% increase in elastic anisotropy from A = 3.131 \→ 3.618 is observed upon heating from RT to 927 \°C, with an increased rate of softening above 600 \°C (873 K).

}, keywords = {Bayesian inference, Elastic constants, High-temperature, Resonant ultrasound spectroscopy, Single crystal, Superalloy}, issn = {09215093}, doi = {10.1016/j.msea.2020.140507}, url = {https://doi.org/10.1016/j.msea.2020.140507}, author = {Goodlet, Brent R. and Murray, Sean P. and Bales, Ben and Rossin, Jeff and Torbet, Chris J. and Pollock, Tresa M.} } @conference {1596, title = {3D Characterization of the Columnar-to-Equiaxed Transition in Additively Manufactured Inconel 718}, booktitle = {Superalloys 2020}, year = {2020}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, abstract = {

Additive manufacturing (AM) provides enormous process- ing flexibility, enabling novel part geometries and opti- mized designs. Access to a local heat source further per- mits the potential for local microstructure control on the scale of individual melt pools, which can enable local con- trol of part properties. In order to design tailored process- ing strategies for target microstructures, models predict- ing the columnar-to-equiaxed transition must be extended to the high solidification velocities and complex thermal histories present in AM. Here, we combine 3D charac- terization with advanced modeling techniques to develop a more complete understanding of the solidification pro- cess and evolution of microstructure during electron beam melting (EBM) of Inconel 718. Full calibration of existing microstructure prediction models demonstrates the differ- ences between AM processes and more conventional weld- ing techniques, underlying the need for accurate deter- mination of key parameters that can only be measured directly in 3D. The ability to combine multisensor data in a consistent 3D framework via data fusion algorithms is essential to fully leverage these advanced characteriza- tion approaches. Thermal modeling provides insight on microstructure development within isolated solidification events and demonstrates the role of Marangoni effects on controlling solidification behavior.

}, keywords = {Additive manufacturing, Microstructure, Solidification, Tomography}, isbn = {9783030518349}, doi = {10.1007/978-3-030-51834-9}, url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65}, author = {Polonsky, Andrew T. and Raghavan, Narendran and Echlin, Mclean P. and Kirka, Michael M. and Dehoff, Ryan R. and Pollock, Tresa M.}, editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane} } @article {1806, title = {Assessment of grain structure evolution with resonant ultrasound spectroscopy in additively manufactured nickel alloys}, journal = {Materials Characterization}, volume = {167}, year = {2020}, pages = {110501}, abstract = {

Despite the advantages of metal additive manufacturing (AM), ensuring integrity and reproducibility for built components is a barrier to the implementation of AM components in critical applications. Component qualification necessitates Non-Destructive Evaluation (NDE), but existing NDE frameworks are insufficient for the rapid and cost effective screening of variable AM components. In this study, alterations in laser powder bed fusion (LPBF) AM process parameters were characterized using resonant ultrasound spectroscopy (RUS). Samples that were subjected to a Hot Isostatic Press (HIP) and Heat Treatment (HT) post-processing step exhibited changes in resonance frequencies that varied in magnitude and direction with the type of resonance mode. The initial build direction prior to HIP and HT had a negligible effect on resonant frequency changes after recrystallization. The change in resonant frequencies at each process condition was predicted using Finite Element Modeling (FEM) informed with Electron Backscatter Diffraction (EBSD) data. FEM identified that the experimentally measured change in resonant response between the initially textured state and the recrystallized state was dominated by grain orientation dependent changes in elasticity. The EBSD-estimated elastic constants and FEM results were validated using experimental laser vibrometry and RUS inversion of elastic constants. RUS Inversion by Bayesian inference and Hamiltonian Monte Carlo has not been used to characterize an AM nickel-base alloy prior to this work. These results demonstrate that RUS is capable of detecting part to part microstructure variability between built AM components.

}, keywords = {Additive manufacturing, Bayesian inference, Elastic constant inversion, Finite element modeling, Recrystallization, Resonance ultrasound spectroscopy}, issn = {1044-5803}, doi = {https://doi.org/10.1016/j.matchar.2020.110501}, url = {https://www.sciencedirect.com/science/article/pii/S1044580320319720}, author = {Jeff Rossin and Brent Goodlet and Chris Torbet and William Musinski and Marie Cox and Jonathan Miller and Michael Groeber and Alexander Mayes and Eric Biedermann and Stephen Smith and Samantha Daly and Tresa Pollock} } @article {1416, title = {Automated and quantitative analysis of plastic strain localization via multi-modal data recombination}, journal = {Materials Characterization}, volume = {163}, year = {2020}, pages = {110245}, issn = {10445803}, doi = {10.1016/j.matchar.2020.110245}, url = {https://linkinghub.elsevier.com/retrieve/pii/S1044580319335569}, author = {Charpagne, M.A. and Stinville, J.C. and Callahan, P.G. and Texier, D. and Chen, Z. and Villechaise, P. and Valle, V. and Pollock, T.m.} } @conference {1611, title = {Creep, Fatigue, and Oxidation Interactions During High and Very High Cycle Fatigue at Elevated Temperature of Nickel-Based Single Crystal Superalloys}, booktitle = {Superalloys 2020}, year = {2020}, abstract = {

High-temperature fatigue of Ni-based single crystal superalloys is studied at 1000 \°C in a wide range of loading conditions (\−1 ? R ? 0.8) and number of cycles (103 \− 109). Under fully reversed conditions, a competition between crack initiations from the surface\— assisted by oxidation\—and from internal metallurgical defects\—mostly large casting pores\—is observed. Increasing the testing frequency shifts the competition to a higher number of cycles. Conversely, decreasing the casting pore size or coating the specimen promotes surface initiations. When a positive mean stress is added (R ? 0), a creep deformation/damage mechanism mainly controls fatigue life, despite fracture surfaces presenting a variety of initiation types. Fatigue life can be predicted by a simple creep law if the contribution of the alternating stress is considered. A linear damage summation method that considers pure fatigue and pure creep damage is used to predict the fatigue lives, and Haigh diagrams for different alloys are presented.

}, keywords = {Creep, fatigue, High temperature, Superalloy}, isbn = {9783030518349}, doi = {10.1007/978-3-030-51834-9}, url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65}, author = {Cervellon, A. and Yi, J. Z. and Corpace, F. and Hervier, Z. and Rigney, J. and Wright, P. K. and Torbet, C. J. and Cormier, J. and Jones, J. W. and Pollock, T. M.}, editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane} } @article {1626, title = {Measurement of elastic and rotation fields during irreversible deformation using Heaviside-digital image correlation}, journal = {Materials Characterization}, volume = {169}, year = {2020}, month = {11/2020}, pages = {110600}, abstract = {

The recent development of the high resolution and discontinuity-tolerant digital image correlation technique enables the extraction of discontinuities within a displacement field. The technique provides quantitative analysis of discontinuities arising from slip, shear bands, cracks, and grain boundary sliding in a variety of material systems, including polycrystalline metallic materials. The discontinuity-tolerant digital image correlation method can be implemented to retrieve not only quantitative discontinuity analysis but also the local strain and rotation fields that operate near these discontinuities. The present implementation includes high-resolution digital image correlation (HR-DIC) measurements collected in a scanning electron microscope for analysis of both the plastic and elastic fields that develop during deformation of polycrystalline metallic materials. The combination of the discontinuity-tolerant DIC technique with the computation of internal gradients enables extraction of non-localized strain and rotation fields during plastic deformation of a nickel-based superalloy. Therefore the lattice rotation/expansion and plastic localization that occur during deformation can be determined in a single experiment. This method is validated using synthetic images with preset deformation, and experimental measurements using the electron back scatter diffraction (EBSD) technique.

}, doi = {https://doi.org/10.1016/j.matchar.2020.110600}, url = {https://www.sciencedirect.com/science/article/abs/pii/S1044580320320714}, author = {J.C. Stinville and M.A. Charpagne and F. Bourdin and P.G. Callahan and Z. Chen and M.P. Echlin and D. Texier and J. Cormier and P. Villechaise and T.M. Pollock and V. Valle} } @conference {1591, title = {Microstructure and Tensile Properties of a CoNi-Based Superalloy Fabricated by Selective Electron Beam Melting}, booktitle = {Superalloys 2020}, year = {2020}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, abstract = {

Successful application of selective electron beam melting to a novel CoNi-based superalloy named SB-CoNi-10 is demonstrated. Crack-free as-printed microstructures exhibit excellent ductilities above 30\% and ultimate tensile strengths above 1.1 GPa at room temperature in tension. Conventional post-processing consisting of a super-solvus hot isostatic pressing (HIP), a solution heat treatment (SHT), and a low-temperature aging has been applied to remove microstructural inhomogeneities present in the as-printed microstructure. The microstructures of the as-printed and HIP+SHT+Aged alloys have been investigated to determine the effect of post-processing heat treatments on the nanoscale \γ/\γ\&$\#$39; microstructure and the mesoscale grain structure. Tensile tests have been conducted at room temperature and elevated temperatures above 850 {\textopenbullet}C to investigate mechanical properties in both the as-printed and HIP+SHT+Aged conditions. The high- temperature ductility and strength are strongly affected by the microstructure, with a mostly columnar-grained microstructure in the as-printed condition exhibiting superior ductility to the fully recrystallized microstructure in the HIP+SHT+Aged condition.

}, keywords = {Additive manufacturing, CoNi-based superalloys, Mechanical properties}, isbn = {9783030518349}, doi = {10.1007/978-3-030-51834-9}, url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65}, author = {Murray, Sean P. and Pusch, Kira M. and Polonsky, Andrew T. and Torbet, Chris J. and Seward, Gareth G. E. and Nandwana, Peeyush and Kirka, Michael M. and Dehoff, Ryan R. and Zhou, Ning and Forsik, St{\'e}phane A. J. and Slye, William and Pollock, Tresa M.}, editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane} } @article {1526, title = {Non-destructive evaluation of 3D microstructure evolution in strontium titanate}, journal = {Journal of Applied Crystallography}, volume = {53}, year = {2020}, pages = {1{\textendash}11}, abstract = {

Nondestructive X-ray diffraction contrast tomography imaging was used to characterize the microstructure evolution in a polycrystalline bulk strontium titanate specimen. Simultaneous acquisition of diffraction and absorption information allows for the reconstruction of shape and orientation of more than 800 grains in the specimen as well as porosity. Three-dimensional microstructure reconstructions of two coarsening states of the same specimen are presented alongside a detailed exploration of the crystallographic, topological and morphological characteristics of the evolving microstructure. The overall analysis of the 3D structure shows a clear signature of the grain boundary anisotropy, which can be correlated to surface energy anisotropy: the grain boundary plane distribution function shows an excess of {\textlangle}100{\textrangle}-oriented interfaces with respect to a random structure. The results are discussed in the context of interface property anisotropy effects.

}, keywords = {3d materials, contrast tomography, diffraction, grain growth, microstructure evolution, nondestructive x-ray diffraction contrast, science, strontium titanate, to, tomography imaging was used}, doi = {10.1107/S160057672000093X}, author = {Trenkle, Andreas and Syha, Melanie and Rheinheimer, Wolfgang and Callahan, Patrick and Nhuyen, Lily and Ludwig, Wolfgang and Lenthe, William and Echlin, Mclean and Pollock, Tresa and Weygand, Daniel and Hoffmann, Michael and Gumbsch, Peter} } @conference {1606, title = {Role of Non-metallic Inclusions and Twins on the Variability in Fatigue Life in Alloy 718 Nickel Base Superalloy}, booktitle = {Superalloys 2020}, year = {2020}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, abstract = {

Non-metallic inclusions (NMIs) and slip bands parallel to and slightly offset from twin boundaries are observed to be preferential sites for fatigue crack nucleation in wrought superalloys. Potential interactions between NMI cracking and slip activity within neighboring grains or at twin boundaries were investigated under monotonic tensile loading (up to 1.3\% total strain) at room temper- ature. High resolution- and Heaviside-digital image correlation measurements were performed during inter- rupted tensile loading to identify strain localization, associated slip systems, and damage initiation. Different mechanisms and scenarios were identified: (1) Microplas- ticity generally starts at twin boundaries even at stresses as low as 70\% of the macroscopic yield strength, (2) transgranular slip activity intensively develops above the macroscopic yield stress, (3) intense slip activity develops near and parallel to 21\% of the twin boundaries intercepting NMIs, (4) 7\% of the twin boundaries inter- cepting NMIs lead to slip-assisted NMI cracking, (5) no transgranular slip activity participates in NMI cracking, (6) the fraction of cracked NMIs progressively increases with the load, and (7) within the NMIs that initiated cracks, 67\% cracked below 90\% of the macroscopic yield strength without the presence of slip activity in the neighboring grains. While slip-assisted NMI cracking was evidenced in the present study, most NMI cracking is due to strain incompatibility between NMIs and neighboring grains at the high end of the elastic regime without slip interaction.

}, keywords = {fatigue, High Resolution-Digital Image Correlation (HR-DIC), In-situ tensile testing, Non-metallic inclusions (NMIs), Twin boundary}, isbn = {9783030518349}, doi = {10.1007/978-3-030-51834-9}, url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65}, author = {Texier, Damien and Stinville, Jean-Charles and Charpagne, Marie-agathe and Chen, Zhe and Valle, Valery and Villechaise, Patrick and Pollock, Tresa M. and Cormier, Jonathan}, editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane} } @article {1621, title = {Sustainability through alloy design: Challenges and opportunities}, journal = {Progress in Materials Science}, year = {2020}, pages = {100722}, abstract = {

Exciting metallurgical breakthroughs of the last decades alongside the development and wide-ranging availability of new and more capable experimental and theoretical tools for metals research demonstrate that we are witnessing the dawn of a new age in metals design. Historically, the discovery of new metallic materials has enabled the vast majority of the key engineering advances in human history. Current engineering challenges create an urgent need for new metallic materials to further our technological advances in multiple industries that are key to our existence. Yet, present data on metals processing clearly demonstrate the significant environmental impact of the metallurgical industry on our planet\&$\#$39;s future. There are numerous reports in which this impact and corresponding processing solutions are discussed. On the other hand, design of new metallic materials with improved property combinations can help address key environmental challenges in various ways. To this end, the goal of this review is to discuss the most urgent sustainability challenges that can be addressed with alloy design, to help orchestrate the increasing interest in metallurgical research to focus on these most critical challenges.

}, keywords = {Aluminum, High Entropy Alloys, Magnesium, Metallurgy, Shape memory alloys, Steel, Superalloys, Sustainability, Titanium}, issn = {00796425}, doi = {10.1016/j.pmatsci.2020.100722}, url = {https://doi.org/10.1016/j.pmatsci.2020.100722}, author = {Cann, Jaclyn L. and De Luca, Anthony and Dunand, David C. and Dye, David and Miracle, Daniel B. and Oh, Hyun Seok and Olivetti, Elsa A. and Pollock, Tresa M. and Poole, Warren J. and Yang, Rui and Tasan, C. Cem} } @conference {1616, title = {Tuning Strain Localization in Polycrystalline Nickel-Based Superalloys by Thermomechanical Processing}, booktitle = {Superalloys 2020}, year = {2020}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, abstract = {

Thermomechanical processing routes are used to produce microstructures that minimize plastic strain localization at the sub-grain scale in a polycrystalline \γ \− \γ\&$\#$39; nickel- based superalloy. This novel approach is made possible by the use of innovative experimental tools and statistical data analysis that capture slip events over large represen- tative fields of view. Results are correlated to conventional observations of fatigue crack initiation and early stage of propagation. The effect of coherent twin boundaries and primary \γ\&$\#$39; precipitates on fatigue properties and plastic localization is detailed.

}, keywords = {3D microstructure, Annealing twin boundaries, Nickel-based superalloy, Primary γ{\textquoteright} precipitates, Slip bands}, isbn = {9783030518349}, doi = {10.1007/978-3-030-51834-9}, url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65}, author = {Charpagne, M. A. and Stinville, J. C. and Polonsky, A. T. and Echlin, M. P. and Murray, S. P. and Chen, Z. and Bozzolo, N. and Cormier, J. and Valle, V. and Pollock, T. M.}, editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane} } @conference {1601, title = {The Yield Strength Anomaly in Co-Ni Design Space}, booktitle = {Superalloys 2020}, year = {2020}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, abstract = {

A new computational approach to model precipitate compositions and properties in the CoNi-design space for yield strength anomaly prediction is presented. The antiphase boundary (APB) energies on {111} and {010} and the degree of elastic anisotropy are known to influence the yield strength anomaly. APB energies were estimated by a diffuse multi-layer fault (DMLF) model using the structural energies of proximate structures: L12, ca\′, and D023. The elastic moduli were calculated via the energy-strain approach using density functional theory calculations. (Ni1\−xCox)3(Al1\−yWy) was chosen as the model system, and Yoo\&$\#$39;s criterion is evaluated over the entire range ofcompositions to identify regions that exhibit the yield strength anomaly. (Ni0.65Co0.35)3(Al0.5W0.5) has the maximum APB (111) and any two-phase alloy (c + c') in Ni\–Co\–Al\–W system with this precipitate composition might exhibit higher strength upon shearing by a matrix dislocation. ThermoCalc was employed to identify stable L12 regions in (Ni1\−xCox)3(Al1\−yWy). The effect of Co on the yield strength anomaly was investigated experimen- tally in three (Ni1\−xCox)3Al alloys with L12 structure. All three alloys exhibited the yield strength anomaly, validat- ing the computational approach. The addition of Co provides solid solution strengthening to Ni3Al at room temperature; however, this contribution to the overall strength diminished as a function of temperature. CoNi-alloys displayed strengths similar to Ni3Al at elevated temperatures with Co addition resulting in a marginal increase in strength at the peak temperature. The present study elucidates that APB energies from a DMLF model combined with elastic moduli can be employed to predict yield strength anomaly using Yoo\&$\#$39;s criteria.

}, keywords = {Antiphase boundaries, CoNi-based superalloys, Yield strength anomaly}, isbn = {9783030518349}, doi = {10.1007/978-3-030-51834-9}, url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65}, author = {Vamsi, K. V. and Murray, Sean P. and Pollock, Tresa M.}, editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane} } @article {1501, title = {In-plane and out-of-plane deformation at the sub-grain scale in polycrystalline materials assessed by confocal microscopy}, journal = {Acta Materialia}, volume = {169}, year = {2019}, pages = {260{\textendash}274}, abstract = {

High-resolution digital image correlation (HR-DIC) techniques have become essential in material mechanics to assess strain measurements at the scale of the elementary mechanisms responsible of the deformation in polycrystalline materials. The purpose of this study is to demonstrate the use of laser scanning confocal microscopy (LSCM) coupled with DIC techniques to deepen knowledge on the deformation process of a polycrystalline nickel-based superalloy at room temperature. The LSCM technique is capable of detecting both in-plane and out-of-plane strain localization within slip bands at the sub-grain level. The LSCM observations are consistent with previous in-situ scanning electron microscopy (SEM) studies: The onset of crystal plasticity occurs primarily near \Σ3 twin boundaries with macroscopic loading in the elastic domain (macroscopic stress as low as 80\% of the 0.2\% offset yield strength (Y.S. 0.2\% )). This intense irreversible strain localization occurs with either a high Schmid factor (\μ \> 0.43) or a significant elastic modulus difference between the pair of twins (\Δ\Ε \> 100 GPa). In the plastic deformation domain, transgranular slip activity following slip systems with the highest Schmid factor is mostly responsible for the deformation at the grain level, thus leading to strain percolation. The simultaneous in-plane and out-of-plane deformation assessment via the HR-LSCM-DIC technique was found to be essential for the identification of active slip systems. Finally, the HR-LSCM-DIC technique enabled the quantification of the glide amplitude involved in the three-dimensional shearing process at the grain level that solely in-plane measurements cannot provide.

}, keywords = {High Resolution-Digital Image Correlation (HR-DIC), In-situ tensile testing, Laser scanning confocal microscopy (LSCM), Nickel-based polycrystalline superalloy, Strain localization}, issn = {13596454}, doi = {10.1016/j.actamat.2019.03.001}, url = {https://doi.org/10.1016/j.actamat.2019.03.001}, author = {Liu, J. H. and Vanderesse, N. and Stinville, J. C. and Pollock, T. M. and Bocher, P. and Texier, D.} } @article {1521, title = {New frontiers for the materials genome initiative}, journal = {npj Computational Materials}, volume = {5}, year = {2019}, pages = {1{\textendash}23}, abstract = {

The Materials Genome Initiative (MGI) advanced a new paradigm for materials discovery and design, namely that the pace of new materials deployment could be accelerated through complementary efforts in theory, computation, and experiment. Along with numerous successes, new challenges are inviting researchers to refocus the efforts and approaches that were originally inspired by the MGI. In May 2017, the National Science Foundation sponsored the workshop \“Advancing and Accelerating Materials Innovation Through the Synergistic Interaction among Computation, Experiment, and Theory: Opening New Frontiers\” to review accomplishments that emerged from investments in science and infrastructure under the MGI, identify scientific opportunities in this new environment, examine how to effectively utilize new materials innovation infrastructure, and discuss challenges in achieving accelerated materials research through the seamless integration of experiment, computation, and theory. This article summarizes key findings from the workshop and provides perspectives that aim to guide the direction of future materials research and its translation into societal impacts.

}, issn = {20573960}, doi = {10.1038/s41524-019-0173-4}, url = {http://dx.doi.org/10.1038/s41524-019-0173-4}, author = {de Pablo, Juan J. and Jackson, Nicholas E. and Webb, Michael A. and Chen, Long Qing and Moore, Joel E. and Morgan, Dane and Jacobs, Ryan and Pollock, Tresa and Schlom, Darrell G. and Toberer, Eric S. and Analytis, James and Dabo, Ismaila and DeLongchamp, Dean M. and Fiete, Gregory A. and Grason, Gregory M. and Hautier, Geoffroy and Mo, Yifei and Rajan, Krishna and Reed, Evan J. and Rodriguez, Efrain and Stevanovic, Vladan and Suntivich, Jin and Thornton, Katsuyo and Zhao, Ji Cheng} } @article {1496, title = {Short crack propagation from cracked non-metallic inclusions in a Ni-based polycrystalline superalloy}, journal = {Acta Materialia}, volume = {165}, year = {2019}, pages = {241{\textendash}258}, abstract = {

Fatigue cracks initiating from surface and sub-surface non-metallic inclusions (NMIs) have recently been demonstrated to be a necessary but not sufficient explanation for atypically short low-cycle fatigue life in Inconel 718 alloy at intermediate temperature. Therefore, the early stages of short crack propagation from surface NMIs were investigated in a crystallographic and two-dimensional versus three-dimensional morphological manner after room temperature low cycle fatigue (LCF) testing. In the present investigation, NMIs were purposely pre-cracked using different techniques to suppress the natural crack initiation period and thus the incubation period prior to the early stages of crack propagation. Under such fatigue testing conditions, different mechanisms of crack transmission from pre-cracked NMIs were identified: (i) no propagation, (ii) NMI/adjacent metallic grain interfacial debonding, (iii) transgranular crack propagation within the adjacent metallic grain. Focused-ion-beam cross-section observations of numerous fatigue tested NMIs aimed to define a morphological criterion for non-propagating NMIs. Large cracked NMIs at the surface (2c) with limited extension into the depth (a) did not propagate under such fatigue conditions for 2c/a ratio higher than 3. Furthermore, specific crystallographic relationships between NMIs and the adjacent metallic grain explained different crack propagation configurations from pre-cracked NMIs, i.e. interfacial debonding and transgranular crack propagation involving single or multiple-slip activity.

}, keywords = {Focus-ion-beam cross-section (FIB-cross section), Low cycle fatigue, Non-metallic inclusions, Short crack propagation, Superalloy 718DA}, issn = {13596454}, doi = {10.1016/j.actamat.2018.11.051}, author = {Texier, Damien and Stinville, Jean Charles and Echlin, Mclean P. and Pierret, St{\'e}phane and Villechaise, Patrick and Pollock, Tresa M. and Cormier, Jonathan} } @article {1471, title = {Application of chord length distributions and principal component analysis for quantification and representation of diverse polycrystalline microstructures}, journal = {Materials Characterization}, volume = {145}, year = {2018}, pages = {671{\textendash}685}, abstract = {

Quantification of mesoscale microstructures of polycrystalline materials is important for a range of practical tasks of materials design and development. The current protocols of quantifying grain size and morphology often rely on microstructure metrics (e.g., mean grain diameter) that overlook important details of the mesostructure. In this work, we present a quantification framework based on directionally resolved chord length distribution and principal component analysis as a means of extracting additional information from 2-D microstructural maps. Towards this end, we first present in detail a method for calculating chord length distribution based on boundary segments available in modern digital datasets (e.g., from microscopy post-processing) and their low-rank representations by principal component analysis. The utility of the proposed framework for capturing grain size, morphology, and their anisotropy for efficient visualization, representation, and specification of polycrystalline microstructures is then demonstrated in case studies on datasets from synthetic generation, experiments (on Ni-base superalloys), and simulations (on steel during recrystallization).

}, keywords = {Chord length distribution, EBSD, Grain size, Microstructure, Principal component analysis}, issn = {10445803}, doi = {10.1016/j.matchar.2018.09.020}, url = {https://doi.org/10.1016/j.matchar.2018.09.020}, author = {Latypov, Marat I. and K{\"u}hbach, Markus and Beyerlein, Irene J. and Stinville, Jean Charles and Toth, Laszlo S. and Pollock, Tresa M. and Kalidindi, Surya R.} } @article {1316, title = {Creep Behavior of Quinary γ'-Strengthened Co-Based Superalloys}, journal = {Metallurgical and Materials Transactions A}, volume = {49}, year = {2018}, pages = {4090{\textendash}4098}, issn = {1073-5623}, doi = {10.1007/s11661-018-4768-z}, url = {http://link.springer.com/10.1007/s11661-018-4768-z}, author = {Rhein, Robert K. and Callahan, Patrick G. and Murray, Sean P. and Stinville, Jean-Charles and Titus, Michael S. and Van der Ven, Anton and Pollock, Tresa M.} } @article {1436, title = {Measurements of plastic localization by heaviside-digital image correlation}, journal = {Acta Materialia}, volume = {157}, year = {2018}, pages = {307{\textendash}325}, abstract = {

In polycrystalline metallic materials, quantitative and statistical assessment of the plasticity in relation to the microstructure is necessary to understand the deformation processes during mechanical loading. Plastic deformation often localizes into physical slip bands at the sub-grain scale. Detrimental microstructural configurations that result in the formation and evolution of slip bands during loading require advanced strain mapping techniques for the identification of these atomically sharp discontinuities. A new discontinuity-tolerant DIC method, Heaviside-DIC, has been developed to account for discontinuities in the displacement field. Displacement fields have been measured at the scale of the physical slip bands over large areas in nickel-based superalloys by high resolution scanning electron microscopy digital image correlation (SEM DIC). However, conventional DIC methods cannot quantitatively measure plastic localization in the presence of discontinuous kinematic fields such as those produced by slip bands. The Heaviside-DIC technique can autonomously detect discontinuities, providing information about their location, inclination, and identify slip systems (in combination with orientation mapping). Using Heaviside-DIC, discontinuities are physically evaluated as sharp shear-localization events, allowing for the quantitative measure of strain amplitude nearby the discontinuities. Measurements using the new Heaviside-DIC technique are compared to conventional DIC methods for identical materials and imaging conditions.

}, keywords = {Discontinuities measurements, High resolution digital image correlation, Ren{\'e} 88DT polycrystalline superalloy, Scanning electron microscopy, Slip band offset, Slip band shearing, Slip system identification, Strain localization}, issn = {13596454}, doi = {10.1016/j.actamat.2018.07.013}, url = {https://doi.org/10.1016/j.actamat.2018.07.013}, author = {Bourdin, F. and Stinville, J. C. and Echlin, M. P. and Callahan, P. G. and Lenthe, W. C. and Torbet, C. J. and Texier, D. and Bridier, F. and Cormier, J. and Villechaise, P. and Pollock, T. M. and Valle, V.} } @article {1476, title = {Shearing of γ{\textquoteright} particles in Co-base and Co-Ni-base superalloys}, journal = {Acta Materialia}, volume = {161}, year = {2018}, pages = {99{\textendash}109}, abstract = {

Shearing mechanisms of the primary strengthening phase in cobalt-base and cobalt-nickel-base superalloys, \γ\′ (L12), are investigated at the elementary defect level by using a combination of generalized-stacking-fault energy (GSF) calculations and phase field simulations. The GSF energy surfaces of the \γ and \γ\′ phases, as determined from available experimental data and ab initio calculations, are used in the phase field simulations. Sophisticated deformation pathways leading to various planar defects including antiphase boundaries (APB), remnant superlattice intrinsic stacking faults (SISF), APB-SISF-APB ribbons and SISF islands are predicted as a function of alloy composition and particle shapes. The predicted stacking fault configurations for both alloys are consistent with recent transmission electron microscopy observations. Effects of dislocation line tension difference in \γ and \γ\′ phases and planar defect energy variation due to segregation at the planar defects are discussed. The detailed dislocation core structures, effects of dislocation line tension differences on deformation mechanisms, and unique deformation mechanisms uncovered, which include stacking fault ribbon shearing, antiphase boundary shearing, and mixed modes, could be used to improve constitutive microstructure-property relationships in advanced crystal plasticity modeling and to assist in alloy design.

}, keywords = {Ab initio calculation, Dislocation creep, Phase field simulation, Precipitation hardening, Stacking fault ribbon}, issn = {13596454}, doi = {10.1016/j.actamat.2018.09.013}, author = {Feng, L. and Lv, D. and Rhein, R. K. and Goiri, J. G. and Titus, M. S. and Van der Ven, A. and Pollock, T. M. and Wang, Y.} } @article {1176, title = {Transmission Scanning Electron Microscopy: Defect Observations and Image Simulations}, journal = {Ultramicroscopy }, volume = {186}, year = {2018}, chapter = {49}, doi = {https://doi.org/10.1016/j.ultramic.2017.11.004}, author = {Callahan, PG and Stinville, JC and Yao, ER and Echlin, MP and Titus, MS and De Graef, M and Pollock, TM and Gianola, DS} } @article {1231, title = {Forward models for extending the mechanical damage evaluation capability of resonant ultrasound spectroscopy}, journal = {Ultrasonics}, volume = {77}, year = {2017}, pages = {183{\textendash}196}, doi = {10.1016/j.ultras.2017.02.002}, author = {Goodlet, B.r. and Torbet, C.j. and Biedermann, E.j. and Jauriqui, L.m. and Aldrin, J.c. and Pollock, T.m.} } @article {1216, title = {Materials response to glancing incidence femtosecond laser ablation}, journal = {Acta Materialia}, volume = {124}, year = {2017}, pages = {46}, chapter = {37}, doi = {https://doi.org/10.1016/j.actamat.2016.10.055}, url = {https://www.sciencedirect.com/science/article/pii/S1359645416308229}, author = {Echlin, MP and Titus, MS and Gumbsch, P and Pollock, TM} } @article {1221, title = {Measurement of Strain Localization Resulting from Monotonic and Cyclic Loading at 650 oC in Nickel Base Superalloys}, journal = {Experimental Mechanics}, volume = {57}, year = {2017}, pages = {1289{\textendash}1309}, doi = {10.1007/s11340-017-0286-y}, author = {Stinville, J. C. and Echlin, M. P. and Callahan, P. G. and Miller, V. M. and Texier, D. and Bridier, F. and Bocher, P. and Pollock, T. M.} } @article {1236, title = {Microstructural Statistics for Fatigue Crack Initiation in Polycrystalline Nickel-base Superalloys}, journal = {International Journal of Fracture}, volume = {208}, year = {2017}, pages = {240}, chapter = {221}, doi = {https://doi.org/10.1007/s10704-017-0241-z}, url = {https://link.springer.com/article/10.1007/s10704-017-0241-z}, author = {Stinville, JC and Lenthe, William C and Echlin, MP and Callahan, PG and Texier, Damien and Pollock, TM} } @article {echlin2016femtosecond, title = {Femtosecond Laser Damage in Metals and Semiconductors During TriBeam Tomography}, journal = {Microsc. Microanal}, volume = {22}, year = {2016}, pages = {3}, author = {Echlin, MP and Titus, M and Lenthe, WC and Straw, M and Gumbsch, P and Pollock, TM and Fraunhofer, IWM} } @article {texier2016microstructural, title = {Microstructural features controlling the variability in low-cycle fatigue properties of alloy Inconel 718DA at intermediate temperature}, journal = {Metallurgical and Materials Transactions A}, volume = {47}, number = {3}, year = {2016}, pages = {1096{\textendash}1109}, publisher = {Springer US}, author = {Texier, Damien and G{\'o}mez, Ana Casanova and Pierret, St{\'e}phane and Franchet, Jean-Michel and Pollock, Tresa M and Villechaise, Patrick and Cormier, Jonathan} } @article {eggeler2016planar, title = {Planar defect formation in the g' phase during high temperature creep in single crystal CoNi-base superalloys}, journal = {Acta Materialia}, volume = {113}, year = {2016}, pages = {335{\textendash}349}, publisher = {Pergamon}, author = {Eggeler, YM and M{\"u}ller, J and Titus, MS and Suzuki, A and Pollock, TM and Spiecker, E} } @article {miller2016recrystallization, title = {Recrystallization and the Development of Abnormally Large Grains After Small Strain Deformation in a Polycrystalline Nickel-Based Superalloy}, journal = {Metallurgical and Materials Transactions A}, volume = {47}, number = {4}, year = {2016}, pages = {1566{\textendash}1574}, publisher = {Springer US}, author = {Miller, Victoria M and Johnson, Anthony E and Torbet, Chris J and Pollock, Tresa M} } @article {stinville2016sub, title = {Sub-grain scale digital image correlation by electron microscopy for polycrystalline materials during elastic and plastic deformation}, journal = {Experimental Mechanics}, volume = {56}, number = {2}, year = {2016}, pages = {197{\textendash}216}, publisher = {Springer US}, author = {Stinville, JC and Echlin, MP and Texier, D and Bridier, F and Bocher, P and Pollock, TM} } @article {jackson2016thermal, title = {Thermal expansion behavior of new Co-based alloys and implications for coatings}, journal = {Surface and Coatings Technology}, volume = {289}, year = {2016}, pages = {61{\textendash}68}, publisher = {Elsevier}, author = {Jackson, R Wesley and Titus, Michael S and Begley, Matthew R and Pollock, Tresa M} } @article {titus2015creep, title = {Creep-induced planar defects in L1 2-containing Co-and CoNi-base single-crystal superalloys}, journal = {Acta Materialia}, volume = {82}, year = {2015}, pages = {530{\textendash}539}, publisher = {Pergamon}, author = {Titus, Michael S and Eggeler, Yolita M and Suzuki, Akane and Pollock, Tresa M} } @article {titus2015dislocation, title = {Dislocation injection in strontium titanate by femtosecond laser pulses}, journal = {Journal of Applied Physics}, volume = {118}, number = {7}, year = {2015}, pages = {075901}, publisher = {AIP Publishing}, author = {Titus, Michael S and Echlin, McLean P and Gumbsch, Peter and Pollock, Tresa M} } @article {jorgensen2015femtosecond, title = {Femtosecond laser ablation and nanoparticle formation in intermetallic NiAl}, journal = {Applied Surface Science}, volume = {353}, year = {2015}, pages = {700{\textendash}707}, publisher = {North-Holland}, author = {Jorgensen, David J and Titus, Michael S and Pollock, Tresa M} } @article {titus2015high, title = {High resolution energy dispersive spectroscopy mapping of planar defects in L1 2-containing co-base superalloys}, journal = {Acta Materialia}, volume = {89}, year = {2015}, pages = {423{\textendash}437}, publisher = {Pergamon}, author = {Titus, Michael S and Mottura, Alessandro and Viswanathan, G Babu and Suzuki, Akane and Mills, Michael J and Pollock, Tresa M} } @article {echlin2015situ, title = {In situ Femtosecond Laser and Argon Ion Beams for 3D Microanalysis using the TriBeam}, journal = {Microscopy and Microanalysis}, volume = {21}, number = {S3}, year = {2015}, pages = {1847{\textendash}1848}, publisher = {Cambridge University Press}, author = {Echlin, MP and Lenthe, WC and Douglas, J and Titus, M and Guerts, R and Straw, M and Pollock, TM} } @article {lenthe2015quantitative, title = {Quantitative Analysis of Correlated 3D Strontium Titanate Datasets Collected by TriBeam and Diffraction Contrast Tomography}, journal = {Microscopy and Microanalysis}, volume = {21}, number = {S3}, year = {2015}, pages = {2043{\textendash}2044}, publisher = {Cambridge University Press}, author = {Lenthe, WC and Echlin, MP and Syha, M and Trenkle, A and Gumbsch, P and Pollock, TM} } @article {lenthe2015quantitative, title = {Quantitative voxel-to-voxel comparison of TriBeam and DCT strontium titanate three-dimensional data sets}, journal = {Journal of Applied Crystallography}, volume = {48}, number = {4}, year = {2015}, pages = {1034{\textendash}1046}, publisher = {International Union of Crystallography}, author = {Lenthe, William C and Echlin, MP and Trenkle, Andreas and Syha, Melanie and Gumbsch, Peter and Pollock, Tresa M} } @conference {biedermann2015resonance, title = {Resonance ultrasound spectroscopy forward modeling and inverse characterization of nickel-based superalloys}, booktitle = {41ST ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Volume 34}, volume = {1650}, number = {1}, year = {2015}, pages = {835{\textendash}844}, publisher = {AIP Publishing}, organization = {AIP Publishing}, author = {Biedermann, Eric and Jauriqui, Leanne and Aldrin, John C and Goodlet, Brent and Pollock, Tresa and Torbet, Chris and Mazdiyasni, Siamack} } @article {rhein2015role, title = {Role of vibrational and configurational excitations in stabilizing the L 1 2 structure in Co-rich Co-Al-W alloys}, journal = {Physical Review B}, volume = {92}, number = {17}, year = {2015}, pages = {174117}, publisher = {American Physical Society}, author = {Rhein, Robert K and Dodge, Philip C and Chen, Min-Hua and Titus, Michael S and Pollock, Tresa M and Van der Ven, Anton} } @article {theillard2015sharp, title = {A sharp computational method for the simulation of the solidification of binary alloys}, journal = {Journal of Scientific Computing}, volume = {63}, number = {2}, year = {2015}, pages = {330{\textendash}354}, publisher = {Springer US}, author = {Theillard, Maxime and Gibou, Fr{\'e}d{\'e}ric and Pollock, Tresa} } @article {steuer2014creep, title = {Creep behavior under isothermal and non-isothermal conditions of AM3 single crystal superalloy for different solutioning cooling rates}, journal = {Materials Science and Engineering: A}, volume = {601}, year = {2014}, pages = {145{\textendash}152}, publisher = {Elsevier}, author = {Steuer, S and Hervier, Z and Thabart, S and Castaing, C and Pollock, TM and Cormier, J} } @article {eggeler2014creep, title = {Creep deformation-induced antiphase boundaries in L1 2-containing single-crystal cobalt-base superalloys}, journal = {Acta Materialia}, volume = {77}, year = {2014}, pages = {352{\textendash}359}, publisher = {Pergamon}, author = {Eggeler, Yolita M and Titus, Michael S and Suzuki, Akane and Pollock, Tresa M} } @article {zhu2014experimental, title = {Experimental investigation and thermodynamic modeling of the Co-rich region in the Co-Al-Ni-W quaternary system}, journal = {Journal of Phase Equilibria and Diffusion}, volume = {35}, number = {5}, year = {2014}, pages = {595{\textendash}611}, publisher = {Springer US}, author = {Zhu, J and Titus, MS and Pollock, TM} } @article {titus2014sub, title = {Sub-nanometer Resolution Chemi-STEM EDS Mapping of Superlattice Intrinsic Stacking Faults in Co-based Superalloys}, journal = {Microscopy and Microanalysis}, volume = {20}, number = {S3}, year = {2014}, pages = {1028{\textendash}1029}, publisher = {Cambridge University Press}, author = {Titus, Michael S and Suzuki, Akane and Mills, Michael J and Pollock, Tresa M} } @article {echlin2013ebsd, title = {EBSD Imaging of Femtosecond Laser Ablated Surfaces Using the TriBeam System}, journal = {Microscopy and Microanalysis}, volume = {19}, number = {S2}, year = {2013}, pages = {864{\textendash}865}, publisher = {Cambridge Univ Press}, author = {Echlin, MP and Titus, M and Kraemer, S and Pollock, T} } @article {titus2012creep, title = {Creep and directional coarsening in single crystals of new $\gamma${\textendash}$\gamma$' cobalt-base alloys}, journal = {Scripta Materialia}, volume = {66}, number = {8}, year = {2012}, pages = {574{\textendash}577}, publisher = {Elsevier}, author = {Titus, Michael S and Suzuki, Akane and Pollock, Tresa M} } @article {terbush2012dependence, title = {The dependence of creep behavior on elemental partitioning in Mg-5Al-3Ca-xSn alloys}, journal = {Metallurgical and Materials Transactions A}, volume = {43}, number = {9}, year = {2012}, pages = {3120{\textendash}3134}, publisher = {Springer US}, author = {TerBush, Jessica R and Chen, Olivia H and Jones, J Wayne and Pollock, Tresa M} } @article {douglas2012enhanced, title = {Enhanced thermoelectric properties of bulk TiNiSn via formation of a TiNi2Sn second phase}, journal = {Applied Physics Letters}, volume = {101}, number = {18}, year = {2012}, pages = {183902}, publisher = {AIP Publishing}, author = {Douglas, Jason E and Birkel, Christina S and Miao, Mao-Sheng and Torbet, Chris J and Stucky, Galen D and Pollock, Tresa M and Seshadri, Ram} } @article {madison2012fluid, title = {Fluid flow and defect formation in the three-dimensional dendritic structure of nickel-based single crystals}, journal = {Metallurgical and Materials Transactions A}, volume = {43}, number = {1}, year = {2012}, pages = {369{\textendash}380}, publisher = {Springer}, author = {Madison, J and Spowart, JE and Rowenhorst, DJ and Aagesen, LK and Thornton, K and Pollock, TM} } @article {titus2012high, title = {High Temperature Creep of New L12 Containing Cobalt-Base Superalloys}, journal = {Superalloys 2012}, year = {2012}, pages = {823{\textendash}832}, publisher = {Wiley Online Library}, author = {Titus, Michael S and Suzuki, Akane and Pollock, Tresa M} } @article {echlin2012new, title = {A new TriBeam system for three-dimensional multimodal materials analysis}, journal = {Review of Scientific Instruments}, volume = {83}, number = {2}, year = {2012}, pages = {023701}, publisher = {AIP Publishing}, author = {Echlin, McLean P and Mottura, Alessandro and Torbet, Christopher J and Pollock, Tresa M} } @article {rettberg2012rejuvenation, title = {Rejuvenation of Nickel-Based Superalloys GTD444 (DS) and Ren{\'e} N5 (SX)}, journal = {Superalloys 2012}, year = {2012}, pages = {341{\textendash}349}, publisher = {John Wiley \& Sons, Inc.}, author = {Rettberg, LH and Tsunekane, M and Pollock, TM} } @article {adharapurapu2011chromia, title = {Chromia-Assisted Decarburization of W-Rich Ni-Based Alloys in Impure Helium at 1273 K (1000{\textdegree} C)}, journal = {Metallurgical and Materials Transactions A}, volume = {42}, number = {5}, year = {2011}, pages = {1229{\textendash}1244}, publisher = {Springer}, author = {Adharapurapu, Raghavendra R and Kumar, Deepak and Zhu, Jun and Torbet, Christopher J and Was, Gary S and Pollock, Tresa M} } @article {mercer2011comparative, title = {A comparative investigation of oxide formation on EQ (Equilibrium) and NiCoCrAlY bond coats under stepped thermal cycling}, journal = {Surface and Coatings Technology}, volume = {205}, number = {8}, year = {2011}, pages = {3066{\textendash}3072}, publisher = {Elsevier}, author = {Mercer, C and Kawagishi, K and Tomimatsu, T and Hovis, D and Pollock, TM} } @article {terbush2011creep, title = {Creep and Elemental Partitioning Behavior of Mg-Al-Ca-Sn Alloys with the Addition of Sr}, journal = {Magnesium Technology 2011}, year = {2011}, pages = {215{\textendash}222}, publisher = {John Wiley \& Sons, Inc.}, author = {TerBush, Jessica R and Chen, Olivia H and Jones, J Wayne and Pollock, Tresa M} } @article {torralva2011critical, title = {The Critical Role of Shock Melting in Ultrafast Laser Machining}, journal = {Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 United States.[np]. Feb}, year = {2011}, publisher = {Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 United States}, author = {Torralva, Ben and Ma, S and Kumar, A and Yalisove, SM and Pollock, TM and Thornton, K} } @article {liu2011situ, title = {In situ synchrotron X-ray imaging of high-cycle fatigue crack propagation in single-crystal nickel-base alloys}, journal = {Acta Materialia}, volume = {59}, number = {13}, year = {2011}, pages = {5103{\textendash}5115}, publisher = {Elsevier}, author = {Liu, L and Husseini, NS and Torbet, CJ and Lee, W-K and Clarke, R and Jones, JW and Pollock, TM} } @article {tsunekane2011single, title = {Single-crystal solidification of new Co{\textendash}Al{\textendash}W-base alloys}, journal = {Intermetallics}, volume = {19}, number = {5}, year = {2011}, pages = {636{\textendash}643}, publisher = {Elsevier}, author = {Tsunekane, Masafumi and Suzuki, Akane and Pollock, Tresa M} } @booklet {pollock20103d, title = {3D simulations for property determination via reconstructed microstructure in nickel-base superalloys.}, year = {2010}, publisher = {Sandia National Laboratories}, author = {Pollock, Tresa M and Thornton, Katsuyo and Rowenhorst, David J and Spowart, Jonathan E and Madison, Jonathan D} } @article {tu2010deformation, title = {Deformation and strain storage mechanisms during high-temperature compression of a powder metallurgy nickel-base superalloy}, journal = {Metallurgical and Materials Transactions A}, volume = {41}, number = {8}, year = {2010}, pages = {2002{\textendash}2009}, publisher = {Springer US}, author = {Tu, Wen J and Pollock, Tresa M} } @conference {terbush2010elemental, title = {Elemental partitioning and microstructure of Mg-Al-Ca-Sn quaternary alloys}, booktitle = {TMS 2010: Aluminium and Magnesium (TMS 14 February 2010 to 18 February 2010)}, year = {2010}, pages = {1{\textendash}5}, publisher = {TMS}, organization = {TMS}, author = {TerBush, Jessica and Chen, Olivia and Jones, J and Pollock, Tresa} } @article {kumar2010situ, title = {In situ characterization of fatigue damage evolution in a cast Al alloy via nonlinear ultrasonic measurements}, journal = {Acta Materialia}, volume = {58}, number = {6}, year = {2010}, pages = {2143{\textendash}2154}, publisher = {Pergamon}, author = {Kumar, Anish and Torbet, Christopher J and Pollock, Tresa M and Jones, J Wayne} } @article {madison2010modeling, title = {Modeling fluid flow in three-dimensional single crystal dendritic structures}, journal = {Acta Materialia}, volume = {58}, number = {8}, year = {2010}, pages = {2864{\textendash}2875}, publisher = {Elsevier}, author = {Madison, J and Spowart, J and Rowenhorst, D and Aagesen, LK and Thornton, K and Pollock, TM} } @article {pollock2010new, title = {New Co-based g-g' high-temperature alloys}, journal = {JOM}, volume = {62}, number = {1}, year = {2010}, pages = {58{\textendash}63}, publisher = {Springer}, author = {Pollock, TM and Dibbern, J and Tsunekane, M and Zhu, J and Suzuki, A} } @article {terbush2010partitioning, title = {Partitioning of Solute to the Primary $\alpha$-Mg Phase in Creep-Resistant Mg-Al-Ca{\textendash}Based Cast Alloys}, journal = {Metallurgical and Materials Transactions A}, volume = {41}, number = {9}, year = {2010}, pages = {2435{\textendash}2442}, publisher = {Springer}, author = {TerBush, Jessica R and Saddock, Nicholas D and Jones, J Wayne and Pollock, Tresa M} } @booklet {madison2010permeability, title = {Permeability Determination via 3 D Reconstruction of the Mushy Zone of Nickel-Base Single Cyrstals}, howpublished = {Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 USA.[np]. 14-18 Feb}, year = {2010}, publisher = {Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 USA}, author = {Madison, Jonathan and Spowart, Jonathan and Rowenhorst, Dave and Thornton, Katsuyo and Pollock, Tresa} } @booklet {brundidge2010real, title = {Real Time Synchrotron Radiography of High Temperature High Cycle Fatigue Crack Growth in Single-Crystal Nickel-Base Superalloys}, howpublished = {Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 USA.[np]. 14-18 Feb}, year = {2010}, publisher = {Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 USA}, author = {Brundidge, Clinique L and Husseini, Naji and Hanson, Erik and Torbet, Chris and Clarke, Roy and Jones, JWayne and Pollock, Tresa} } @article {cao2009microstructural, title = {Microstructural evolution and failure characteristics of a NiCoCrAlY bond coat in {\textquotedblleft}hot spot{\textquotedblright} cyclic oxidation}, journal = {Acta Materialia}, volume = {57}, number = {13}, year = {2009}, pages = {3885{\textendash}3894}, publisher = {Elsevier}, author = {Cao, F and Tryon, B and Torbet, CJ and Pollock, TM} } @article {kumar2009nonlinear, title = {Nonlinear ultrasonics for in situ damage detection during high frequency fatigue}, journal = {Journal of Applied Physics}, volume = {106}, number = {2}, year = {2009}, pages = {024904}, publisher = {AIP Publishing}, author = {Kumar, Anish and Torbet, Christopher J and Jones, J Wayne and Pollock, Tresa M} } @conference {terbush2008comparative, title = {A comparative examination of aging and creep behavior of die-cast MRI230D and AXJ530}, booktitle = {Symposium on Magnesium Technology 2008 (TMS 9 March 2008 to 13 March 2008)}, year = {2008}, pages = {117{\textendash}122}, publisher = {The Minerals, Metals \& Materials Society (TMS)}, organization = {The Minerals, Metals \& Materials Society (TMS)}, author = {TerBush, Jessica and Jones, J and Pollock, Tresa} } @article {liu2008situ, title = {In situ imaging of high cycle fatigue crack growth in single crystal nickel-base superalloys by synchrotron X-radiation}, journal = {Journal of Engineering Materials and Technology}, volume = {130}, number = {2}, year = {2008}, pages = {021008}, publisher = {American Society of Mechanical Engineers}, author = {Liu, Liu and Husseini, Naji S and Torbet, Christopher J and Kumah, Divine P and Clarke, Roy and Pollock, Tresa M and Jones, J Wayne} } @conference {pollock2008intermetallic, title = {Intermetallic Bond Coats: Systems Compatibility and Platinum-Group Metal Additions}, booktitle = {MRS Proceedings}, volume = {1128}, year = {2008}, pages = {1128{\textendash}U06}, publisher = {Cambridge University Press}, organization = {Cambridge University Press}, author = {Pollock, Tresa and Widrevitz, Dan and Pong, Russell and Cao, Fang and Tryon, Bryan} } @article {husseini2008mapping, title = {Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation}, journal = {Acta Materialia}, volume = {56}, number = {17}, year = {2008}, pages = {4715{\textendash}4723}, publisher = {Pergamon}, author = {Husseini, Naji S and Kumah, Divine P and Jian, Z Yi and Torbet, Christopher J and Arms, Dohn A and Dufresne, Eric M and Pollock, Tresa M and Jones, J Wayne and Clarke, Roy} } @article {johnson2008post, title = {Post-fabrication vapor phase strengthening of nickel-based sheet alloys for thermostructural panels}, journal = {Acta Materialia}, volume = {56}, number = {17}, year = {2008}, pages = {4577{\textendash}4584}, publisher = {Elsevier}, author = {Johnson, SJ and Tryon, B and Pollock, TM} } @article {feng2007cyclic, title = {Cyclic oxidation of Ru-containing single crystal superalloys at 1100 C}, journal = {Materials Science and Engineering: A}, volume = {458}, number = {1}, year = {2007}, pages = {184{\textendash}194}, publisher = {Elsevier}, author = {Feng, Q and Tryon, B and Carroll, LJ and Pollock, TM} } @article {ma2007femtosecond, title = {Femtosecond laser ablation regimes in a single-crystal superalloy}, journal = {Metallurgical and Materials Transactions A}, volume = {38}, number = {13}, year = {2007}, pages = {2349{\textendash}2357}, publisher = {Springer}, author = {Ma, S and McDonald, JP and Tryon, B and Yalisove, SM and Pollock, TM} } @article {tryon2007hybrid, title = {Hybrid intermetallic Ru/Pt-modified bond coatings for thermal barrier systems}, journal = {Surface and Coatings Technology}, volume = {202}, number = {2}, year = {2007}, pages = {349{\textendash}361}, publisher = {Elsevier}, author = {Tryon, B and Murphy, KS and Yang, JY and Levi, CG and Pollock, TM} } @booklet {saddock2007permanent, title = {Permanent Mold Casting and Creep Behavior of Mg-4 Al-4 X:(Ca, Ce, La, Sr) Alloys}, year = {2007}, publisher = {SAE Technical Paper}, author = {Saddock, Nicholas D and Suzuki, Akane and TerBush, Jessica R and Jones, J Wayne and Pollock, Tresa M and Zindel, Jake and Allison, John E} } @article {kulkarni2007ternary, title = {Ternary diffusion in a RuAl-NiAl couple}, journal = {Journal of Phase Equilibria and Diffusion}, volume = {28}, number = {6}, year = {2007}, pages = {503{\textendash}509}, publisher = {Springer US}, author = {Kulkarni, KN and Tryon, B and Pollock, TM and Dayananda, MA} } @article {yi2007ultrasonic, title = {Ultrasonic fatigue of a single crystal Ni-base superalloy at 1000 C}, journal = {Materials Science and Engineering: A}, volume = {443}, number = {1}, year = {2007}, pages = {142{\textendash}149}, publisher = {Elsevier}, author = {Yi, JZ and Torbet, CJ and Feng, Q and Pollock, TM and Jones, JW} } @article {tryon2006experimental, title = {Experimental assessment of the Ru{\textendash}Al{\textendash}Ni ternary phase diagram at 1000 and 1100{\textdegree} C}, journal = {Materials Science and Engineering: A}, volume = {430}, number = {1}, year = {2006}, pages = {266{\textendash}276}, publisher = {Elsevier}, author = {Tryon, B and Pollock, TM} } @article {mendis2006microstructural, title = {Microstructural observations of as-prepared and thermal cycled NiCoCrAlY bond coats}, journal = {Surface and Coatings Technology}, volume = {201}, number = {7}, year = {2006}, pages = {3918{\textendash}3925}, publisher = {Elsevier}, author = {Mendis, BG and Tryon, B and Pollock, TM and Hemker, KJ} } @conference {saddock2006microstructure, title = {Microstructure and mechanical properties of permanent mold cast Mg-4 A1-4 (Ca, Ce, La, or Sr) ternary alloys}, booktitle = {Symposium on Magnesium Technology 2006 (TMS 12 March 2006 to 16 March 2006)}, year = {2006}, pages = {77{\textendash}82}, publisher = {The Minerals, Metals \& Materials Society (TMS)}, organization = {The Minerals, Metals \& Materials Society (TMS)}, author = {Saddock, Nicholas and Suzuki, Akane and TerBush, Jessica and Heininger, Eric and Zindel, Jacob and Allison, John and Pollock, Tresa and Jones, J} } @article {tryon2006multilayered, title = {Multilayered ruthenium-modified bond coats for thermal barrier coatings}, journal = {Metallurgical and Materials Transactions A}, volume = {37}, number = {11}, year = {2006}, pages = {3347{\textendash}3358}, publisher = {Springer}, author = {Tryon, B and Feng, Q and Pollock, TM and Wellman, RG and Nicholls, JR and Murphy, KS and Yang, J and Levi, CG} } @article {pollock2006nickel, title = {Nickel-based superalloys for advanced turbine engines: chemistry, microstructure and properties}, journal = {Journal of propulsion and power}, volume = {22}, number = {2}, year = {2006}, pages = {361{\textendash}374}, author = {Pollock, Tresa M and Tin, Sammy} } @article {tryon2006ruthenium, title = {Ruthenium-containing bond coats for thermal barrier coating systems}, journal = {JoM}, volume = {58}, number = {1}, year = {2006}, pages = {53{\textendash}59}, publisher = {Springer}, author = {Tryon, B and Cao, F and Murphy, KS and Levi, CG and Pollock, TM} } @article {feng2004deformation, title = {Deformation of Ru{\textendash}Al{\textendash}Ta ternary alloys}, journal = {Intermetallics}, volume = {12}, number = {7}, year = {2004}, pages = {755{\textendash}762}, publisher = {Elsevier}, author = {Feng, Q and Nandy, TK and Tryon, B and Pollock, TM} } @conference {shyam2004development, title = {Development of ultrasonic fatigue for rapid, high temperature fatigue studies in turbine engine materials}, booktitle = {10th International Symposium on Superalloys, Champion, PA, September}, year = {2004}, pages = {19{\textendash}23}, author = {Shyam, A and Torbet, CJ and Jha, SK and Larsen, JM and Caton, MJ and Szczepanski, CJ and Pollock, TM and Jones, JW} } @article {elliott2004directional, title = {Directional solidification of large superalloy castings with radiation and liquid-metal cooling: a comparative assessment}, journal = {Metallurgical and Materials Transactions A}, volume = {35}, number = {10}, year = {2004}, pages = {3221{\textendash}3231}, publisher = {Springer-Verlag}, author = {Elliott, AJ and Pollock, TM and Tin, S and King, WT and Huang, S-C and Gigliotti, MFX} } @article {tryon2004intermetallic, title = {Intermetallic phases formed by ruthenium{\textendash}nickel alloy interdiffusion}, journal = {Intermetallics}, volume = {12}, number = {7}, year = {2004}, pages = {957{\textendash}962}, publisher = {Elsevier}, author = {Tryon, B and Feng, Q and Pollock, T} } @conference {feng2004new, title = {New Phases in Ruthenium-Containing Single-Crystal Superalloys}, booktitle = {Superalloys 2004: The Tenth International Symposium on Superalloys}, year = {2004}, pages = {769{\textendash}778}, author = {Feng, Q and Nandy, TK and Rowland, LJ and Tryon, B and Banerjee, D and Pollock, TM} } @article {tin2004predicting, title = {Predicting freckle formation in single crystal Ni-base superalloys}, journal = {Journal of materials science}, volume = {39}, number = {24}, year = {2004}, pages = {7199{\textendash}7205}, publisher = {Springer}, author = {Tin, S and Pollock, TM} } @article {tryon2004thermal, title = {Thermal expansion behavior of ruthenium aluminides}, journal = {Scripta Materialia}, volume = {50}, number = {6}, year = {2004}, pages = {845{\textendash}848}, publisher = {Pergamon}, author = {Tryon, B and Pollock, TM and Gigliotti, MFX and Hemker, K} } @conference {elliott2003defect, title = {Defect reduction in large superalloy castings by liquid-tin assisted solidification.}, booktitle = {PARSONS 2003: Sixth International Charles Parsons Turbine Conference}, year = {2003}, pages = {649{\textendash}661}, author = {Elliott, AJ and Pollock, TM and Tin, S and King, WT and Huang, S-C and Gigliotti, MFX} } @article {tin2003phase, title = {Phase instabilities and carbon additions in single-crystal nickel-base superalloys}, journal = {Materials Science and Engineering: A}, volume = {348}, number = {1}, year = {2003}, pages = {111{\textendash}121}, publisher = {Elsevier}, author = {Tin, S and Pollock, TM} } @article {feng2003solidification, title = {Solidification of high-refractory ruthenium-containing superalloys}, journal = {Acta Materialia}, volume = {51}, number = {1}, year = {2003}, pages = {269{\textendash}284}, publisher = {Elsevier}, author = {Feng, Q and Nandy, TK and Tin, S and Pollock, TM} } @article {tin2003stabilization, title = {Stabilization of thermosolutal convective instabilities in Ni-based single-crystal superalloys: Carbide precipitation and Rayleigh numbers}, journal = {Metallurgical and Materials Transactions A}, volume = {34}, number = {9}, year = {2003}, pages = {1953{\textendash}1967}, publisher = {Springer-Verlag}, author = {Tin, S and Pollock, TM} } @article {li2001effect, title = {On the effect of low and high pressure hydrogen charging on the oxidation of a Ti{\textendash}48Al{\textendash}2Cr{\textendash}2Nb alloy}, journal = {Materials Science and Engineering: A}, volume = {318}, number = {1}, year = {2001}, pages = {224{\textendash}234}, publisher = {Elsevier}, author = {Li, K and Pollock, TM and De Graef, M and Habel, U and Thompson, AW} } @article {tin2001stabilization, title = {Stabilization of thermosolutal convective instabilities in Ni-based single-crystal superalloys: Carbon additions and freckle formation}, journal = {Metallurgical and Materials Transactions A}, volume = {32}, number = {7}, year = {2001}, pages = {1743{\textendash}1753}, publisher = {Springer-Verlag}, author = {Tin, S and Pollock, TM and Murphy, W} } @conference {tin2000carbides, title = {Carbides and grain defect formation in directionally solidified nickel-base superalloys}, booktitle = {Advanced Technologies for Superalloy Affordability as held at the 2000 TMS Annual Meeting}, year = {2000}, pages = {2000}, author = {Tin, S and Pollock, T and Murphy, W} } @article {li1995new, title = {A new phase in hydrogen-charged Ti 48Al 2Cr 2Nb}, journal = {Scripta metallurgica et materialia}, volume = {32}, number = {7}, year = {1995}, pages = {1009{\textendash}1014}, publisher = {Pergamon}, author = {Li, K and Pollock, TM and Thompson, AW and De Graef, M} } @article {pollock1992grain, title = {Grain defect formation during directional solidification of nickel base single crystals}, journal = {Superalloys 1992}, year = {1992}, pages = {125{\textendash}134}, publisher = {The Minerals, Metals and Materials Society Warrendale, PA}, author = {Pollock, TM and Murphy, WH and Goldman, EH and Uram, DL and Tu, JS} } @article {thompson1991creep, title = {Creep of $\alpha$ 2+ $\beta$ Titanium Aluminide Alloys}, journal = {ISIJ International}, volume = {31}, number = {10}, year = {1991}, pages = 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