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Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entropy alloy

Author

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  • X. H. Du

    (Hong Kong Institute for Advanced Study, City University of Hong Kong
    Shenyang Aerospace University)

  • W. P. Li

    (Hong Kong Institute for Advanced Study, City University of Hong Kong)

  • H. T. Chang

    (Shenyang Aerospace University)

  • T. Yang

    (Hong Kong Institute for Advanced Study, City University of Hong Kong)

  • G. S. Duan

    (Shenyang Aerospace University)

  • B. L. Wu

    (Shenyang Aerospace University)

  • J. C. Huang

    (Hong Kong Institute for Advanced Study, City University of Hong Kong
    National Sun Yat-Sen University)

  • F. R. Chen

    (Hong Kong Institute for Advanced Study, City University of Hong Kong)

  • C. T. Liu

    (Hong Kong Institute for Advanced Study, City University of Hong Kong)

  • W. S. Chuang

    (National Sun Yat-Sen University)

  • Y. Lu

    (Beijing University of Technology)

  • M. L. Sui

    (Beijing University of Technology)

  • E. W. Huang

    (National Chiao Tung University)

Abstract

Alloys with ultra-high strength and sufficient ductility are highly desired for modern engineering applications but difficult to develop. Here we report that, by a careful controlling alloy composition, thermomechanical process, and microstructural feature, a Co-Cr-Ni-based medium-entropy alloy (MEA) with a dual heterogeneous structure of both matrix and precipitates can be designed to provide an ultra-high tensile strength of 2.2 GPa and uniform elongation of 13% at ambient temperature, properties that are much improved over their counterparts without the heterogeneous structure. Electron microscopy characterizations reveal that the dual heterogeneous structures are composed of a heterogeneous matrix with both coarse grains (10∼30 μm) and ultra-fine grains (0.5∼2 μm), together with heterogeneous L12-structured nanoprecipitates ranging from several to hundreds of nanometers. The heterogeneous L12 nanoprecipitates are fully coherent with the matrix, minimizing the elastic misfit strain of interfaces, relieving the stress concentration during deformation, and playing an active role in enhanced ductility.

Suggested Citation

  • X. H. Du & W. P. Li & H. T. Chang & T. Yang & G. S. Duan & B. L. Wu & J. C. Huang & F. R. Chen & C. T. Liu & W. S. Chuang & Y. Lu & M. L. Sui & E. W. Huang, 2020. "Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entropy alloy," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16085-z
    DOI: 10.1038/s41467-020-16085-z
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    Cited by:

    1. Chengyi Yu & Kun Lin & Qinghua Zhang & Huihui Zhu & Ke An & Yan Chen & Dunji Yu & Tianyi Li & Xiaoqian Fu & Qian Yu & Li You & Xiaojun Kuang & Yili Cao & Qiang Li & Jinxia Deng & Xianran Xing, 2024. "An isotropic zero thermal expansion alloy with super-high toughness," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Tong Li & Tianwei Liu & Shiteng Zhao & Yan Chen & Junhua Luan & Zengbao Jiao & Robert O. Ritchie & Lanhong Dai, 2023. "Ultra-strong tungsten refractory high-entropy alloy via stepwise controllable coherent nanoprecipitations," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. Wenjin Guo & Guangfang Li & Chengbo Bai & Qiong Liu & Fengxi Chen & Rong Chen, 2024. "General synthesis and atomic arrangement identification of ordered Bi–Pd intermetallics with tunable electrocatalytic CO2 reduction selectivity," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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