@article {1831, title = {Perspective: Large Language Models in Applied Mechanics}, journal = {Journal of Applied Mechanics}, volume = {90}, year = {2023}, month = {06}, pages = {1-12}, doi = {10.1115/1.4062773}, author = {Brodnik, Neal and Carton, Samuel and Muir, Caelin and Ghosh, Satanu and Downey, Doug and Echlin, Mclean and Pollock, Tresa and Daly, Samantha} } @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 {1761, title = {Precipitate Shearing, Fault Energies, and Solute Segregation to Planar Faults in Ni-, CoNi-, and Co-Base Superalloys}, journal = {Annual Review of Materials Research}, volume = {51}, year = {2021}, pages = {209-240}, abstract = {

The mechanical properties of superalloys are strongly governed by the resistance to shearing of ordered precipitates by dislocations. In the operating environments of superalloys, the stresses and temperatures present during thermomechanical loading influence the dislocation shearing dynamics, which involve diffusion and segregation processes that result in a diverse array of planar defects in the ordered L12 \γ\′ precipitate phase. This review discusses the current understanding of high-temperature deformation mechanisms of \γ\′ precipitates in two-phase Ni-, Co-, and CoNi-base superalloys. The sensitivity of planar fault energies to chemical composition results in a variety of unique deformation mechanisms, and methods to determine fault energies are therefore reviewed. The degree of chemical segregation in the vicinity of planar defects reveals an apparent phase transformation within the parent \γ\′ phase. The kinetics of segregation to linear and planar defects play a significant role in high-temperature properties. Understanding and controlling fault energies and the associated dislocation dynamics provide a new pathway for the design of superalloys with exceptional properties.

}, doi = {10.1146/annurev-matsci-102419-011433}, url = {https://doi.org/10.1146/annurev-matsci-102419-011433}, author = {Eggeler, Y.M. and Vamsi, K.V. and Pollock, T.m.} } @article {1376, title = {Protocols for High Temperature Assisted-Microwave Preparation of Inorganic Compounds}, journal = {Chemistry of Materials}, volume = {31}, year = {2019}, pages = {7151{\textendash}7159}, abstract = {

Assisted-microwave heating involves the use of a susceptor to initially heat up reactants in a microwave reaction. Once hot, the reactants themselves become directly susceptible to microwave heating and interdiffuse to form products. Assisted-microwave methods are appealing for a wide variety of high temperature solid-state reactions, reaching reaction temperatures of 1500 \°C and more. Among the many advantages are that the direct volumetric heating associated with microwaves allows for rapid reaction times while employing significantly less energy than conventional furnace-based preparation. Shorter reaction times and selective heating permit volatile reactants to be incorporated stoichiometrically in the product. Undesirable reactions with containers or enclosures are also minimized. The morphology of powders obtained through microwave reactions are also more uniform and comprise smaller particles than obtained conventionally. This Methods/Protocols article is presented as a user manual for carrying out assisted-microwave preparation of bulk complex oxides in air or reducing atmospheres and sol-gel based processing of complex oxides, air sensitive intermetallics, and transition metal chalcogenides.

}, issn = {15205002}, doi = {10.1021/acs.chemmater.9b02594}, author = {Levin, Emily E. and Grebenkemper, Jason H. and Pollock, Tresa M. and Seshadri, Ram} } @article {1481, title = {Prediction of tensile stiffness and strength of Ti-6Al-4V using instantiated volume elements and crystal plasticity}, journal = {Acta Materialia}, volume = {157}, year = {2018}, pages = {21{\textendash}32}, abstract = {

Based on simulations of tensile tests, the macroscopic stiffness and strength of the \α phase of Ti-6Al-4V are estimated. Sets of virtual samples are instantiated using characterization data from three-dimensional electron back-scattered diffraction (EBSD) scans collected with the TriBeam microscope and local properties extracted from in situ loading high-energy x-ray diffraction (HEXD) experiments. The simulations use a crystal-scale finite element framework to compute the mechanical response of the virtual samples under tensile loading. From the simulation data, mechanical properties are extracted from volume elements ranging in size from a fraction of the gage section to its entire length. To detect macroscopic yield, a flood-fill algorithm is used to identify a zone of plastically deformed finite elements extending through a volume element. Trends in the estimated properties as functions of the volume element size are examined. The lower bound of volume element size necessary to replicate experimentally measured macroscale properties is indicated. The technique and results provide a guideline for estimating macroscale property values in components designed with size smaller than the lower bound due to constraint.

}, keywords = {Crystal plasticity finite element, Stiffness, Titanium, Volume element size, Yield detection}, issn = {13596454}, doi = {10.1016/j.actamat.2018.07.011}, url = {https://doi.org/10.1016/j.actamat.2018.07.011}, author = {Chatterjee, Kamalika and Echlin, Mclean P. and Kasemer, Matthew and Callahan, Patrick G. and Pollock, Tresa M. and Dawson, Paul} } @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 {lenthe2016prediction, title = {Prediction of Fatigue-Initiating Twin Boundaries in Polycrystalline Nickel Superalloys Informed by TriBeam Tomography}, journal = {Microscopy and Microanalysis}, volume = {22}, number = {S3}, year = {2016}, pages = {1732{\textendash}1733}, publisher = {Cambridge University Press}, author = {Lenthe, William C and Stinville, Jean-Charles and Echlin, McLean P and Pollock, Tresa M} } @article {miller2016prediction, title = {Prediction of Magnesium Alloy Formability: The Role of Texture}, journal = {Magnesium Technology 2016}, year = {2016}, pages = {257{\textendash}262}, publisher = {John Wiley \& Sons, Inc.}, author = {Miller, VM and Berman, TD and Beyerlein, IJ and Pollock, TM} } @article {miller2016prediction, title = {Prediction of the plastic anisotropy of magnesium alloys with synthetic textures and implications for the effect of texture on formability}, journal = {Materials Science and Engineering: A}, volume = {675}, year = {2016}, pages = {345{\textendash}360}, publisher = {Elsevier}, author = {Miller, Victoria M and Berman, Tracy D and Beyerlein, Irene J and Jones, J Wayne and Pollock, Tresa M} } @article {van2015pt, title = {A Pt-modified Ni-base superalloy with high temperature precipitate stability}, journal = {Materials Science and Engineering: A}, volume = {639}, year = {2015}, pages = {747{\textendash}754}, publisher = {Elsevier}, author = {Van Sluytman, Jason S and Moceri, Charles J and Pollock, Tresa M} } @article {douglas2014phase, title = {Phase stability and property evolution of biphasic Ti{\textendash}Ni{\textendash}Sn alloys for use in thermoelectric applications}, journal = {Journal of Applied Physics}, volume = {115}, number = {4}, year = {2014}, pages = {043720}, publisher = {AIP Publishing}, author = {Douglas, Jason E and Birkel, Christina S and Verma, Nisha and Miller, Victoria M and Miao, Mao-Sheng and Stucky, Galen D and Pollock, Tresa M and Seshadri, Ram} } @article {nizolek2014processing, title = {Processing and deformation behavior of bulk Cu{\textendash}Nb nanolaminates}, journal = {Metallography, Microstructure, and Analysis}, volume = {3}, number = {6}, year = {2014}, pages = {470{\textendash}476}, publisher = {Springer US}, author = {Nizolek, T and Mara, NA and Beyerlein, IJ and Avallone, JT and Scott, JE and Pollock, TM} } @article {miller2012process, title = {Process Simulation for the Directional Solidification of a Tri-Crystal Ring Segment via the Bridgman and Liquid-Metal-Cooling Processes}, journal = {Metallurgical and Materials Transactions A}, volume = {43}, number = {7}, year = {2012}, pages = {2414{\textendash}2425}, publisher = {Springer}, author = {Miller, JD and Pollock, TM} } @article {brundidge2012processing, title = {Processing to fatigue properties: benefits of high gradient casting for single crystal airfoils}, journal = {Superalloys 2012}, year = {2012}, pages = {379{\textendash}385}, publisher = {John Wiley \& Sons, Inc.}, author = {Brundidge, Clinique L and Pollock, Tresa M} } @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} } @article {chen2010pulsed, title = {Pulsed-terahertz reflectometry for health monitoring of ceramic thermal barrier coatings}, journal = {Optics express}, volume = {18}, number = {4}, year = {2010}, pages = {3477{\textendash}3486}, publisher = {Optical Society of America}, author = {Chen, Chia-Chu and Lee, Dong-Joon and Pollock, Tresa and Whitaker, John F} } @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 {suzuki2008precipitation, title = {Precipitation strengthening of a Mg-Al-Ca{\textendash}based AXJ530 die-cast alloy}, journal = {Metallurgical and Materials Transactions A}, volume = {39}, number = {3}, year = {2008}, pages = {696{\textendash}702}, publisher = {Springer US}, author = {Suzuki, Akane and Saddock, ND and TerBush, JR and Powell, BR and Jones, JW 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 {suzuki2006phase, title = {Phase equilibria in the Mg-Al-Ca ternary system at 773 and 673 K}, journal = {Metallurgical and Materials Transactions A}, volume = {37}, number = {3}, year = {2006}, pages = {975{\textendash}983}, publisher = {Springer}, author = {Suzuki, Akane and Saddock, Nicholas D and Jones, J Wayne and Pollock, Tresa M} } @article {suzuki2005phase, title = {Phase Transformation and Creep of Mg-Al-Ca Based Die-Cast Alloys}, journal = {Essential Readings in Magnesium Technology}, year = {2005}, pages = {291{\textendash}296}, publisher = {John Wiley \& Sons, Inc.}, author = {Suzuki, Akane and Saddock, Nicholas D and Jones, J Wayne and Pollock, Tresa M} } @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 {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} } @conference {argon1987phenomenology, title = {Phenomenology and mechanisms of recovery creep}, booktitle = {Proc. 8th Int. Symp. on Metallurgy and Materials Science, RISO National Lab., Roskilde, Denmark}, year = {1987}, pages = {39{\textendash}54}, author = {Argon, AS and Bhattacharya, AK and Pollock, Tresa M} }