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Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics

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  • Huixin Jin

    (Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
    Shandong University
    Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
    Zhejiang University)

  • Jianxin Zhang

    (Shandong University)

  • Pan Li

    (Shandong University
    Institute of Systems Engineering, AMS, PLA)

  • Youjian Zhang

    (Shandong University
    Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing)

  • Wenyang Zhang

    (Shandong University)

  • Jingyu Qin

    (Shandong University)

  • Lihua Wang

    (Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology)

  • Haibo Long

    (Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology)

  • Wei Li

    (Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology)

  • Ruiwen Shao

    (Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Engineering Medicine, Beijing Institute of Technology)

  • En Ma

    (Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University)

  • Ze Zhang

    (Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
    Zhejiang University)

  • Xiaodong Han

    (Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology)

Abstract

Understanding how topologically close-packed phases (TCPs) transform between one another is one of the challenging puzzles in solid-state transformations. Here we use atomic-resolved tools to dissect the transition among TCPs, specifically the μ and P (or σ) phases in nickel-based superalloys. We discover that the P phase originates from intrinsic (110) faulted twin boundaries (FTB), which according to first-principles calculations is of extraordinarily low energy. The FTB sets up a pathway for the diffusional in-flux of the smaller 3d transition metal species, creating a Frank interstitial dislocation loop. The climb of this dislocation, with an unusual Burgers vector that displaces neighboring atoms into the lattice positions of the product phase, accomplishes the structural transformation. Our findings reveal an intrinsic link among these seemingly unrelated TCP configurations, explain the role of internal lattice defects in facilitating the phase transition, and offer useful insight for alloy design that involves different complex phases.

Suggested Citation

  • Huixin Jin & Jianxin Zhang & Pan Li & Youjian Zhang & Wenyang Zhang & Jingyu Qin & Lihua Wang & Haibo Long & Wei Li & Ruiwen Shao & En Ma & Ze Zhang & Xiaodong Han, 2022. "Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30040-0
    DOI: 10.1038/s41467-022-30040-0
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    References listed on IDEAS

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    1. Kaushik Bhattacharya & Sergio Conti & Giovanni Zanzotto & Johannes Zimmer, 2004. "Crystal symmetry and the reversibility of martensitic transformations," Nature, Nature, vol. 428(6978), pages 55-59, March.
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