Polymorphism in a high-entropy alloy

Zhang, Fei; Wu, Yuan; Lou, Hongbo; Zeng, Zhidan; Prakapenka, Vitali B.; Greenberg, Eran; Ren, Yang; Yan, Jinyuan; Okasinski, John S.; Liu, Xiongjun; Liu, Yong; Zeng, Qiaoshi; Lu, Zhaoping

doi:10.1038/ncomms15687

Title: Polymorphism in a high-entropy alloy

Journal Article · Thu Jun 01 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms15687· OSTI ID:1411660

Zhang, Fei ^[1]; Wu, Yuan ^[2]; Lou, Hongbo ^[3]; Zeng, Zhidan ^[3]; Prakapenka, Vitali B. ^[4];

^[4]; Ren, Yang ^[5]; Yan, Jinyuan ^[6]; Okasinski, John S. ^[5]; Liu, Xiongjun ^[2]; Liu, Yong ^[7];

^[8]; Lu, Zhaoping ^[2]

Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials; Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials
Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Univ. of California, Santa Cruz, CA (United States). Dept. of Earth and Planetary Sciences
Central South Univ., Hunan (China). State Key Lab. of Powder Metallurgy
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Southeast Univ., Nanjing (China). School of Materials Science and Engineering

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. Lastly, as pressure is increased, the critical temperature for the hcp-to-fcc transformation also rises.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Science Foundation (NSF), Directorate for Geosciences Division of Earth Sciences (GEO/EAR); National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: AC02-05CH11231; FG02-94ER14466; EAR-1128799; AC02-06CH11357

OSTI ID:: 1411660

Alternate ID(s):: OSTI ID: 1372480

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 204 works

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