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DOE OSTI · 2516796

Nanotwinned alloys under high pressure

Wang, Melody M. [Stanford Univ., CA (United States)] (ORCID:0000000344311946)·Dang, Ruoqi [Nanyang Technological Univ. (Singapore); Agency for Science, Technology and Research (A*STAR) (Singapore)]·Parakh, Abhinav [Stanford Univ., CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000229137073)·Lee, Andrew C. [Stanford Univ., CA (United States)]·Li, Zhi [Agency for Science, Technology and Research (A*STAR) (Singapore)]·Chariton, Stella [Univ. of Chicago, IL (United States)] (ORCID:0000000155220498)·Prakapenka, Vitali B. [Univ. of Chicago, IL (United States)]·Kang, Jiyun [Stanford Univ., CA (United States)]·Zhang, Yong-Wei [Agency for Science, Technology and Research (A*STAR) (Singapore)] (ORCID:0000000172551678)·Hodge, Andrea M. [Univ. of Southern California, Los Angeles, CA (United States)] (ORCID:0000000199457841)·Gao, Huajian [Nanyang Technological Univ. (Singapore); Agency for Science, Technology and Research (A*STAR) (Singapore)]·Gu, X. Wendy [Stanford Univ., CA (United States)] (ORCID:0000000154777040)
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Abstract

Nanotwinned alloys are of interest due to their high strength and ductility, but twin boundaries may not be stable under shear. Computational studies indicate that high hydrostatic pressure may suppress detwinning mechanisms. Here, in this study, we investigate the microstructural changes of nanotwinned-nanocrystalline copper-nickel and Inconel 725 alloys under quasi-hydrostatic pressures up to 50 gigapascals (GPa). The alloys are compressed in a diamond anvil cell. In-situ x-ray diffraction (XRD) and ex-situ transmission electron microscopy (TEM) were employed to monitor microstructural changes. Twin boundary deformation and grain growth occur at 11.4 GPa quasi-hydrostatic pressure in the copper-nickel alloy. Molecular dynamics (MD) simulations reveal that hydrostatic pressure causes elevated local shear stress at grain boundaries, which leads to atomic rearrangements. A superposition of hydrostatic and deviatoric pressures lead to partial dislocation mediated twin boundary migration. In contrast, the Inconel 725 alloy showed stable twin and grain boundaries up to a quasi-hydrostatic pressure of 12.7 GPa. Texture, high solid solution strengthening, and low stacking fault energy are hypothesized to the enhanced microstructural stability in Inconel 725.

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36 MATERIALS SCIENCE42 ENGINEERING75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY77 NANOSCIENCE AND NANOTECHNOLOGYGrain boundariesHigh-pressureMolecular dynamicsNanotwinsX-ray diffraction

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Wang, Melody M. [Stanford Univ., CA (United States)] (ORCID:0000000344311946), Dang, Ruoqi [Nanyang Technological Univ. (Singapore); Agency for Science, Technology and Research (A*STAR) (Singapore)], Parakh, Abhinav [Stanford Univ., CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000229137073), Lee, Andrew C. [Stanford Univ., CA (United States)], Li, Zhi [Agency for Science, Technology and Research (A*STAR) (Singapore)], Chariton, Stella [Univ. of Chicago, IL (United States)] (ORCID:0000000155220498), Prakapenka, Vitali B. [Univ. of Chicago, IL (United States)], Kang, Jiyun [Stanford Univ., CA (United States)], Zhang, Yong-Wei [Agency for Science, Technology and Research (A*STAR) (Singapore)] (ORCID:0000000172551678), Hodge, Andrea M. [Univ. of Southern California, Los Angeles, CA (United States)] (ORCID:0000000199457841), Gao, Huajian [Nanyang Technological Univ. (Singapore); Agency for Science, Technology and Research (A*STAR) (Singapore)], Gu, X. Wendy [Stanford Univ., CA (United States)] (ORCID:0000000154777040). 2024-12-13. Nanotwinned alloys under high pressure. https://doi.org/10.1016/j.actamat.2024.120654

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