DOE OSTI · 3144957
Shock-induced phase transitions and stacking fault formation in additively manufactured eutectic high-entropy alloy Ni 40 Co 20 Fe 10 Cr 10 Al 18 W 2
Abstract
Ni 40 Co 20 Fe 10 Cr 10 Al 18 W 2 additively manufactured using laser powder bed fusion (LPBF) is among the toughest as-built alloys reported and is a promising candidate for use in extreme environments. However, its behavior under multi-megabar pressure regimes remains unexplored. We used femtosecond in situ X-ray diffraction to investigate the shock response of LPBF Ni40Co20Fe10Cr10Al18W2 under laser-driven shock compression and release. Our results reveal that the initial dual-phase face-centered + body-centered structure transforms to a single face-centered phase over a wide pressure range of 84±10 to 277±55 GPa, followed by a transition to a single body-centered phase at 431±48 GPa. We establish the Hugoniot equation-of-state of LPBF Ni 40 Co 20 Fe 10 Cr 10 Al 18 W 2 and compare it to the benchmark alloy AlCoCrFeNi 2.1 , demonstrating the effects of W-doping and increased Al content. High stacking fault probabilities, close to those measured in Au and Ag, are observed upon compression. A portion of the stacking faults are annihilated upon release to ambient pressure.
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Lin, Rayen [Stanford Univ., CA (United States); Univ. of California, Los Angeles, CA (United States)] (ORCID:0009000991836009), Hari, Anirudh [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)], Cubit, Ernest W. [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)], Katagiri, Kento [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)], Parsons, Sophie [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000281846600), Xu, Zipeng [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)], Ren, Jie [Univ. of Massachusetts, Amherst, MA (United States)], Yang, Wuxian [Univ. of Southern California, Los Angeles, CA (United States)], Amouretti, Alexis [Osaka Univ. (Japan)], Irvine, Sara J. [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0009000826377769), Kodama, Ryosuke [Osaka Univ. (Japan)], Madril, Laura [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)], Miyanishi, Kohei [RIKEN SPring-8 Center, Sayo (Japan)], Nakamura, Hirotaka [Osaka Univ. (Japan)], Ozaki, Norimasa [Osaka Univ. (Japan)], Reddy, Tharun [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)], Seto, Yusuke [Osaka Metropolitan Univ. (Japan)], Sueda, Keiichi [RIKEN SPring-8 Center, Sayo (Japan)], Togashi, Tadashi [RIKEN SPring-8 Center, Sayo (Japan); Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)], Umeda, Yuhei [Kyoto Univ. (Japan)] (ORCID:0000000296766603), Yabashi, Makina [RIKEN SPring-8 Center, Sayo (Japan); Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)], Yabuuchi, Toshinori [RIKEN SPring-8 Center, Sayo (Japan); Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)] (ORCID:0000000306387640), Vohra, Yogesh K. [Univ. of Alabama, Birmingham, AL (United States)], Chen, Wen [Univ. of Southern California, Los Angeles, CA (United States)], Dresselhaus-Marais, Leora E. [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000207570159). 2026-04-16. Shock-induced phase transitions and stacking fault formation in additively manufactured eutectic high-entropy alloy Ni 40 Co 20 Fe 10 Cr 10 Al 18 W 2. https://doi.org/10.1016/j.scriptamat.2026.117347
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