@article {2206, title = {Analysis of the high cracking resistance of a Co Ni superalloy during laser additive manufacturing}, journal = {Scripta Materialia}, volume = {239}, year = {2024}, pages = {115770}, abstract = {

A newly developed CoNi-based superalloy is demonstrated to be tolerant of a wide range of laser powder bed fusion print conditions, with limited defect content and high relative densities. These promising traits motivated investigation of the structural uniformity in samples printed at the upper end of the scan velocity processing window (\>Image 1). A new misorientation metric, starting reference orientation deviation (SROD), was calculated from Image 2-scale 3D microstructure information to examine structure evolution during epitaxial growth of columnar grains. Misorientations of \>20\° were observed within the large columnar grains that grew through multiple build layers. The SROD observations highlight the CoNi superalloy\&$\#$39;s ability to plastically deform to high levels, as evidenced by misorientation gradients, across the range of temperatures experienced in laser additive manufacturing. Misorientation gradients within the columnar grain structure are high relative to Ni base superalloys, allowing for strengthening with high volume fractions of L12 precipitates.

}, keywords = {3D EBSD, Rapid solidification, Superalloy}, issn = {1359-6462}, doi = {https://doi.org/10.1016/j.scriptamat.2023.115770}, url = {https://www.sciencedirect.com/science/article/pii/S1359646223004918}, author = {James Lamb and Kira M. Pusch and Andrew T. Polonsky and St{\'e}phane A.J. Forsik and Ning Zhou and Austin D. Dicus and Remco Geurts and McLean P. Echlin and Tresa M. Pollock} } @article {1886, title = {Minor Elements and Solidification Cracking During Laser Powder-Bed Fusion of a High γ' CoNi-Base Superalloy}, journal = {Metallurgical and Materials Transactions}, volume = {54}, year = {2023}, month = {02}, pages = {1-14}, doi = {10.1007/s11661-023-06957-6}, author = {Raeker, Evan and Pusch, Kira and Forsik, St{\'e}phane and Zhou, Ning and Dicus, Austin and Ren, Qing-Qiang and Poplawsky, Jonathan and Kirka, M. and Pollock, Tresa} } @article {1961, title = {Determination of peak ordering in the CrCoNi medium-entropy alloy via nanoindentation}, journal = {Acta Materialia}, volume = {241}, year = {2022}, month = {09}, pages = {118380}, doi = {10.1016/j.actamat.2022.118380}, author = {Zhang, Mingwei and Yu, Qin and Frey, Carolina and Walsh, Flynn and Payne, Madelyn and Kumar, Punit and Liu, Dongye and Pollock, Tresa and Asta, Mark and Ritchie, Robert and Minor, Andrew} } @article {2021, title = {Experimental investigation and thermodynamic modelling of the Mg{\textendash}Al-rich region of the Mg{\textendash}Al{\textendash}Sr System}, journal = {International Journal of Materials Research}, volume = {97}, year = {2022}, month = {01}, pages = {422-428}, doi = {10.1515/ijmr-2006-0070}, author = {Cao, Hongbo and Zhu, Jun and Zhang, Chuan and Wu, Kaisheng and Saddock, Nicholas and Jones, J. and Pollock, Tresa and Schmid-Fetzer, Rainer and Chang, Y.} } @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 {2121, title = {Crystallography and elastic anisotropy in fatigue crack nucleation at nickel alloy twin boundaries}, journal = {Journal of the Mechanics and Physics of Solids}, volume = {155}, year = {2021}, month = {06}, pages = {104538}, doi = {10.1016/j.jmps.2021.104538}, author = {Zhang, Xiaoxian and Stinville, Jean-Charles and Pollock, Tresa and Dunne, Fionn} } @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 {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 {carpenter2015bulk, title = {Bulk texture evolution of nanolamellar Zr{\textendash}Nb composites processed via accumulative roll bonding}, journal = {Acta Materialia}, volume = {92}, year = {2015}, pages = {97{\textendash}108}, publisher = {Pergamon}, author = {Carpenter, JS and Nizolek, T and McCabe, RJ and Knezevic, M and Zheng, SJ and Eftink, BP and Scott, JE and Vogel, SC and Pollock, TM and Mara, NA and others} } @article {carpenter2015suppression, title = {The suppression of instabilities via biphase interfaces during bulk fabrication of nanograined Zr}, journal = {Materials Research Letters}, volume = {3}, number = {1}, year = {2015}, pages = {50{\textendash}57}, publisher = {Taylor \& Francis}, author = {Carpenter, JS and Nizolek, TJ and McCabe, RJ and Zheng, SJ and Scott, JE and Vogel, SC and Mara, NA and Pollock, TM and Beyerlein, IJ} } @article {adharapurapu2014combinatorial, title = {A combinatorial investigation of palladium and platinum additions to $\beta$-NiAl overlay coatings}, journal = {Acta Materialia}, volume = {77}, year = {2014}, pages = {379{\textendash}393}, publisher = {Pergamon}, author = {Adharapurapu, Raghavendra R and Zhu, Jun and Dheeradhada, Voramon S and Lipkin, Don M and Pollock, Tresa M} } @article {adharapurapu2014effective, title = {Effective Hf-Pd Co-doped $\beta$-NiAl (Cr) coatings for single-crystal superalloys}, journal = {Acta Materialia}, volume = {76}, year = {2014}, pages = {449{\textendash}462}, publisher = {Pergamon}, author = {Adharapurapu, Raghavendra R and Zhu, Jun and Dheeradhada, Voramon S and Lipkin, Don M 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} } @conference {ardeljan2014multi, title = {A multi-scale model for texture development in Zr/Nb nanolayered composites processed by accumulative roll bonding}, booktitle = {IOP Conference Series: Materials Science and Engineering}, volume = {63}, number = {1}, year = {2014}, pages = {012170}, publisher = {IOP Publishing}, organization = {IOP Publishing}, author = {Ardeljan, M and Knezevic, M and Nizolek, T and Beyerlein, IJ and Zheng, SJ and Carpenter, JS and McCabe, RJ and Mara, NA and Pollock, TM} } @article {birkel2013improving, title = {Improving the thermoelectric properties of half-Heusler TiNiSn through inclusion of a second full-Heusler phase: microwave preparation and spark plasma sintering of TiNi 1+ x Sn}, journal = {Physical Chemistry Chemical Physics}, volume = {15}, number = {18}, year = {2013}, pages = {6990{\textendash}6997}, publisher = {Royal Society of Chemistry}, author = {Birkel, Christina S and Douglas, Jason E and Lettiere, Bethany R and Seward, Gareth and Verma, Nisha and Zhang, Yichi and Pollock, Tresa M and Seshadri, Ram and Stucky, Galen D} } @article {birkel2013influence, title = {Influence of Ni nanoparticle addition and spark plasma sintering on the TiNiSn{\textendash}Ni system: structure, microstructure, and thermoelectric properties}, journal = {Solid State Sciences}, volume = {26}, year = {2013}, pages = {16{\textendash}22}, publisher = {Elsevier Masson}, author = {Birkel, Christina S and Douglas, Jason E and Lettiere, Bethany R and Seward, Gareth and Zhang, Yichi and Pollock, Tresa M and Seshadri, Ram and Stucky, Galen D} } @article {beyerlein2013interface, title = {Interface-driven microstructure development and ultra high strength of bulk nanostructured Cu-Nb multilayers fabricated by severe plastic deformation}, journal = {Journal of materials research}, volume = {28}, number = {13}, year = {2013}, pages = {1799{\textendash}1812}, publisher = {Cambridge University Press}, author = {Beyerlein, Irene J and Mara, Nathan A and Carpenter, John S and Nizolek, Thomas and Mook, William M and Wynn, Thomas A and McCabe, Rodney J and Mayeur, Jason R and Kang, Keonwook and Zheng, Shijian and others} } @article {birkel2012rapid, title = {rapid microwave preparation of thermoelectric TiNiSn and TiCoSb half-heusler compounds}, journal = {Chemistry of Materials}, volume = {24}, number = {13}, year = {2012}, pages = {2558{\textendash}2565}, publisher = {American Chemical Society}, author = {Birkel, Christina S and Zeier, Wolfgang G and Douglas, Jason E and Lettiere, Bethany R and Mills, Carolyn E and Seward, Gareth and Birkel, Alexander and Snedaker, Matthew L and Zhang, Yichi and Snyder, G Jeffrey and others} } @article {beyerlein2012structure, title = {Structure{\textendash}property{\textendash}functionality of bimetal interfaces}, journal = {Jom}, volume = {64}, number = {10}, year = {2012}, pages = {1192{\textendash}1207}, publisher = {Springer US}, author = {Beyerlein, IJ and Mara, NA and Wang, J and Carpenter, JS and Zheng, SJ and Han, WZ and Zhang, RF and Kang, K and Nizolek, T and Pollock, TM} } @article {adharapurapu2011carburization, title = {Carburization of W-and Re-rich Ni-based alloys in impure helium at 1000{\textdegree} C}, journal = {Corrosion Science}, volume = {53}, number = {1}, year = {2011}, pages = {388{\textendash}398}, publisher = {Elsevier}, author = {Adharapurapu, Raghavendra R and Kumar, Deepak and Zhu, Jun and Pollock, Tresa M} } @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} } @booklet {adharapurapu2010high, title = {High-Temperature Cyclic Oxidation of Pd/Pt-Modified Nial Bond Coats}, 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 = {Adharapurapu, Raghavendra and Widrevitz, Dan and Zhu, Jun and Lipkin, Don and Dheeradhada, Voroman and Pollock, Tresa} } @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 {zhou2009gamma, title = {g' rafting in single crystal blade alloys: a simulation study}, journal = {Materials Science and Technology}, volume = {25}, number = {2}, year = {2009}, pages = {205{\textendash}212}, publisher = {Taylor \& Francis}, author = {Zhou, N and Shen, C and Sarosi, PM and Mills, MJ and Pollock, T and Wang, Y} } @conference {white2009time, title = {TIME DOMAIN TERAHERTZ NON-DESTRUCTIVE EVALUATION OF AEROTURBINE BLADE THERMAL BARRIER COATINGS}, booktitle = {REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Proceedings of the 35th Annual Review of Progress in Quantitative Nondestructive Evaluation}, volume = {1096}, number = {1}, year = {2009}, pages = {434{\textendash}439}, publisher = {AIP Publishing}, organization = {AIP Publishing}, author = {White, Jeffrey and Fichter, G and Chernovsky, A and Whitaker, John F and Das, D and Pollock, Tresa M and Zimdars, David} } @conference {white2008time, title = {Time-domain terahertz mapping of thickness and degradation of aircraft turbine blade thermal barrier coatings}, booktitle = {Conference on Lasers and Electro-Optics}, year = {2008}, pages = {CThN7}, publisher = {Optical Society of America}, organization = {Optical Society of America}, author = {White, Jeffrey and Fichter, G and Chernovsky, A and Zimdars, David A and Whitaker, John F and Das, D and Pollock, Tresa M} } @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 {cao2006experimental, title = {Experimental investigation and thermodynamic modelling of the Mg{\textendash}Al-rich region of the Mg{\textendash}Al{\textendash}Sr System}, journal = {Zeitschrift f{\"u}r Metallkunde}, volume = {97}, number = {4}, year = {2006}, pages = {422{\textendash}428}, publisher = {Carl Hanser Verlag}, author = {Cao, Hongbo and Zhu, Jun and Zhang, Chuan and Wu, Kaisheng and Saddock, Nicholas D and Jones, J Wayne and Pollock, Tresa M and Schmid-Fetzer, Rainer and Chang, Y Austin} } @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} } @booklet {king2000nickel, title = {Nickel-based superalloys exhibiting minimal grain defects}, year = {2000}, note = {US Patent 6,096,141}, author = {King, Warren Tan and Pollock, Tresa M and Zemsky, Christine Louise and Murphy, Wendy Howard} }