Polymorphism in a high-entropy alloy

Fei Zhang, Yuan Wu, Hongbo Lou, Zhidan Zeng, Vitali B. Prakapenka, Eran Greenberg, Yang Ren, Jinyuan Yan, John S. Okasinski, Xiongjun Liu, Yong Liu, Qiaoshi Zeng () and Zhaoping Lu ()
Additional contact information
Fei Zhang: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
Yuan Wu: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
Hongbo Lou: Center for High Pressure Science and Technology Advanced Research
Zhidan Zeng: Center for High Pressure Science and Technology Advanced Research
Vitali B. Prakapenka: Center for Advanced Radiation Sources, University of Chicago
Eran Greenberg: Center for Advanced Radiation Sources, University of Chicago
Yang Ren: Advanced Photon Source, Argonne National Laboratory
Jinyuan Yan: Advanced Light Source, Lawrence Berkeley National Laboratory
John S. Okasinski: Advanced Photon Source, Argonne National Laboratory
Xiongjun Liu: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
Yong Liu: State Key Laboratory of Powder Metallurgy, Central South University
Qiaoshi Zeng: Center for High Pressure Science and Technology Advanced Research
Zhaoping Lu: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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. As pressure is increased, the critical temperature for the hcp-to-fcc transformation also rises.

Date: 2017
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DOI: 10.1038/ncomms15687

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