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Title: Polymorphism in a high-entropy alloy

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [4]; ORCiD logo [4];  [5];  [6];  [5];  [2];  [7]; ORCiD logo [8];  [2]
  1. Univ. of Science and Technology Beijing, Beijing (China); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  2. Univ. of Science and Technology Beijing, Beijing (China)
  3. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  4. Univ. of Chicago, Chicago, IL (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
  7. Central South Univ., Hunan (China)
  8. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Southeast Univ., Nanjing (China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
National Science Foundation (NSF), Directorate for Geosciences Division of Earth Sciences (GEO/EAR); National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1411660
Alternate Identifier(s):
OSTI ID: 1372480
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231; FG02-94ER14466; EAR-1128799
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metals and alloys; phase transitions and critical phenomena

Citation Formats

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, and Lu, Zhaoping. Polymorphism in a high-entropy alloy. United States: N. p., 2017. Web. doi:10.1038/ncomms15687.
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. Polymorphism in a high-entropy alloy. United States. doi:10.1038/ncomms15687.
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, and Lu, Zhaoping. Thu . "Polymorphism in a high-entropy alloy". United States. doi:10.1038/ncomms15687. https://www.osti.gov/servlets/purl/1411660.
@article{osti_1411660,
title = {Polymorphism in a high-entropy alloy},
author = {Zhang, Fei and Wu, Yuan and Lou, Hongbo and Zeng, Zhidan and Prakapenka, Vitali B. and Greenberg, Eran and Ren, Yang and Yan, Jinyuan and Okasinski, John S. and Liu, Xiongjun and Liu, Yong and Zeng, Qiaoshi and Lu, Zhaoping},
abstractNote = {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.},
doi = {10.1038/ncomms15687},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}

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