Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy
Abstract
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.
- Authors:
-
[1];
[2];
[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)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1542318
- Alternate Identifier(s):
- OSTI ID: 1471259
- Grant/Contract Number:
- AC02-05CH11231; FG02-94ER14466; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 11; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Zhang, Fei, Lou, Hongbo, Chen, Songyi, Chen, Xiehang, Zeng, Zhidan, Yan, Jinyuan, Zhao, Wuxin, Wu, Yuan, Lu, Zhaoping, and Zeng, Qiaoshi. Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy. United States: N. p., 2018.
Web. doi:10.1063/1.5046180.
Zhang, Fei, Lou, Hongbo, Chen, Songyi, Chen, Xiehang, Zeng, Zhidan, Yan, Jinyuan, Zhao, Wuxin, Wu, Yuan, Lu, Zhaoping, & Zeng, Qiaoshi. Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy. United States. https://doi.org/10.1063/1.5046180
Zhang, Fei, Lou, Hongbo, Chen, Songyi, Chen, Xiehang, Zeng, Zhidan, Yan, Jinyuan, Zhao, Wuxin, Wu, Yuan, Lu, Zhaoping, and Zeng, Qiaoshi. Fri .
"Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy". United States. https://doi.org/10.1063/1.5046180. https://www.osti.gov/servlets/purl/1542318.
@article{osti_1542318,
title = {Effects of non-hydrostaticity and grain size on the pressure-induced phase transition of the CoCrFeMnNi high-entropy alloy},
author = {Zhang, Fei and Lou, Hongbo and Chen, Songyi and Chen, Xiehang and Zeng, Zhidan and Yan, Jinyuan and Zhao, Wuxin and Wu, Yuan and Lu, Zhaoping and Zeng, Qiaoshi},
abstractNote = {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.},
doi = {10.1063/1.5046180},
journal = {Journal of Applied Physics},
number = 11,
volume = 124,
place = {United States},
year = {2018},
month = {9}
}
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Cited by: 19 works
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Figures / Tables:
FIG. 1: XRD patterns of the CoCrFeMnNi HEA GA samples with helium (a), silicone oil (b), and amorphous boron (c) as the pressure mediums during compression. The initial structure is $fcc$. All three samples gradually transform from $fcc$ into $hcp$ under high pressure. The onset pressures are determined as themore »
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Works referencing / citing this record:
Anomalous Evolution of Strength and Microstructure of High‐Entropy Alloy CoCrFeNiMn after High‐Pressure Torsion at 300 and 77 K
journal, August 2019
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Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating
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