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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? 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.

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 (China). State Key Lab. for Advanced Metals and Materials; Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  2. Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials
  3. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  4. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  6. Univ. of California, Santa Cruz, CA (United States). Dept. of Earth and Planetary Sciences
  7. Central South Univ., Hunan (China). State Key Lab. of Powder Metallurgy
  8. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Southeast Univ., Nanjing (China). School of Materials Science and Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); 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
OSTI Identifier:
1411660
Alternate Identifier(s):
OSTI ID: 1372480
Grant/Contract Number:  
AC02-05CH11231; FG02-94ER14466; EAR-1128799; AC02-06CH11357
Resource Type:
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? 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.},
doi = {10.1038/ncomms15687},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {2017},
month = {6}
}

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    Works referencing / citing this record:

    Pressure-induced magnetovolume effect in CoCrFeAl high-entropy alloy
    journal, May 2019


    Twinning-induced strain hardening in dual-phase FeCoCrNiAl0.5 at room and cryogenic temperature
    journal, July 2018


    First-principles investigation of the micromechanical properties of fcc-hcp polymorphic high-entropy alloys
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    Plastic deformation transition in FeCrCoNiAl x high-entropy alloys
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    High-Entropy Alloys: Potential Candidates for High-Temperature Applications - An Overview
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    First-principles investigation of the micromechanical properties of fcc-hcp polymorphic high-entropy alloys
    journal, July 2018


    Pressure-induced magnetovolume effect in CoCrFeAl high-entropy alloy
    journal, May 2019


    Plastic deformation transition in FeCrCoNiAl x high-entropy alloys
    journal, July 2019