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Polymorphism in a high-entropy alloy

Author

Listed:
  • Fei Zhang

    (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
    Center for High Pressure Science and Technology Advanced Research)

  • 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
    University of California, Santa Cruz)

  • 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
    School of Materials Science and Engineering, Southeast University)

  • Zhaoping Lu

    (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing)

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.

Suggested Citation

  • 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 & Zhaoping Lu, 2017. "Polymorphism in a high-entropy alloy," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
  • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15687
    DOI: 10.1038/ncomms15687
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    Cited by:

    1. Sung-Kyun Jung & Hyeokjo Gwon & Hyungsub Kim & Gabin Yoon & Dongki Shin & Jihyun Hong & Changhoon Jung & Ju-Sik Kim, 2022. "Unlocking the hidden chemical space in cubic-phase garnet solid electrolyte for efficient quasi-all-solid-state lithium batteries," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    2. Mingliang Han & Yuan Wu & Xiaobin Zong & Yaozu Shen & Fei Zhang & Hongbo Lou & Xiao Dong & Zhidan Zeng & Xiangyang Peng & Shuo Hou & Guangyao Lu & Lianghua Xiong & Bingmin Yan & Huiyang Gou & Yanping , 2024. "Lightweight single-phase Al-based complex concentrated alloy with high specific strength," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    3. Zongrui Pei & Shiteng Zhao & Martin Detrois & Paul D. Jablonski & Jeffrey A. Hawk & David E. Alman & Mark Asta & Andrew M. Minor & Michael C. Gao, 2023. "Theory-guided design of high-entropy alloys with enhanced strength-ductility synergy," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    4. Wei Chen & Antoine Hilhorst & Georgios Bokas & Stéphane Gorsse & Pascal J. Jacques & Geoffroy Hautier, 2023. "A map of single-phase high-entropy alloys," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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