Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy

Zhang, Fei; Lou, Hongbo; Chen, Songyi; Chen, Xiehang; Zeng, Zhidan; Yan, Jinyuan; Zhao, Wuxin; Wu, Yuan; Lu, Zhaoping; Zeng, Qiaoshi

doi:10.1063/1.5046180

Title: Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy

Journal Article · 21 September 2018 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5046180 · OSTI ID:1542318

^[1];

^[2]; Chen, Songyi ^[2]; Chen, Xiehang ^[2]; Zeng, Zhidan ^[2]; Yan, Jinyuan ^[3]; Zhao, Wuxin ^[4]; Wu, Yuan ^[4]; Lu, Zhaoping ^[4];

^[2]

Univ. of Science and Technology Beijing, Beijing (China); Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai (China)
Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Univ. of California, Santa Cruz, CA (United States). Dept. of Earth and Planetary Sciences
Univ. of Science and Technology Beijing, Beijing (China)

Recently, an irreversible polymorphic transition from face-centered cubic to hexagonal close-packing was surprisingly observed under high pressure in the prototype CoCrFeMnNi high-entropy alloys (HEAs) by various research groups. This unexpected phase transition brings new insights into the stability of HEAs, and its irreversibility stimulates exploration for new HEAs via high-pressure compression synthesis. However, the onset pressure for the phase transition was reported to fluctuate over a vast range from ~7 to above 49 GPa in the reported experiments. The reason for this inconsistency remains unclear and puzzles the HEA community. To address this problem, this work systematically investigates the effects of non-hydrostaticity and grain size. Our results demonstrate that larger deviatoric stress induced by the non-hydrostaticity of the pressure medium and larger grain size of the initial sample can both promote a phase transition and, therefore, considerably depress the onset pressure.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: AC02-05CH11231; FG02-94ER14466; AC02-06CH11357

OSTI ID:: 1542318

Alternate ID(s):: OSTI ID: 1471259

Journal Information:: Journal of Applied Physics, Vol. 124, Issue 11; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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