期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms15687
关键词
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资金
- National Natural Science Foundation of China [U1530402, 51531001, 51671018, 51422101, 51271212, 51371003]
- 111 Project [B07003]
- International S&T Cooperation Program of China [2015DFG52600]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_14R05]
- National Science Foundation (NSF)-Earth Sciences [EAR-1128799]
- Department of Energy (DOE)-GeoSciences [DE-FG02-94ER14466]
- COMPRES [EAR 11-57758]
- NSF [EAR-1128799]
- DOE [DE-FG02-94ER14466]
- DOE Office of Science [DE-AC02-06CH11357]
- Office of Science, DOE-BES [DE-AC02-05CH11231]
Polymorphism, which describes the occurrence of different lattice structures in a crystalline material, is a critical phenomenon in materials science and condensed matter physics. Recently, configuration disorder was compositionally engineered into single lattices, leading to the discovery of high-entropy alloys and high-entropy oxides. For these novel entropy-stabilized forms of crystalline matter with extremely high structural stability, is polymorphism still possible? Here by employing in situ high-pressure synchrotron radiation X-ray diffraction, we reveal a polymorphic transition from face-centred-cubic (fcc) structure to hexagonal-close-packing (hcp) structure in the prototype CoCrFeMnNi high-entropy alloy. The transition is irreversible, and our in situ high-temperature synchrotron radiation X-ray diffraction experiments at different pressures of the retained hcp high-entropy alloy reveal that the fcc phase is a stable polymorph at high temperatures, while the hcp structure is more thermodynamically favourable at lower temperatures. As pressure is increased, the critical temperature for the hcp-to-fcc transformation also rises.
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