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Chemical inhomogeneity–induced profuse nanotwinning and phase transformation in AuCu nanowires

Author

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  • Chengpeng Yang

    (Beijing University of Technology)

  • Bozhao Zhang

    (Xi’an Jiaotong University)

  • Libo Fu

    (Beijing University of Technology)

  • Zhanxin Wang

    (Beijing University of Technology)

  • Jiao Teng

    (University of Science and Technology Beijing)

  • Ruiwen Shao

    (School of Medical Technology, Beijing Institute of Technology)

  • Ziqi Wu

    (School of Medical Technology, Beijing Institute of Technology)

  • Xiaoxue Chang

    (School of Medical Technology, Beijing Institute of Technology)

  • Jun Ding

    (Xi’an Jiaotong University)

  • Lihua Wang

    (Beijing University of Technology)

  • Xiaodong Han

    (Beijing University of Technology)

Abstract

Nanosized metals usually exhibit ultrahigh strength but suffer from low homogeneous plasticity. The origin of a strength–ductility trade-off has been well studied for pure metals, but not for random solid solution (RSS) alloys. How RSS alloys accommodate plasticity and whether they can achieve synergy between high strength and superplasticity has remained unresolved. Here, we show that face-centered cubic (FCC) RSS AuCu alloy nanowires (NWs) exhibit superplasticity of ~260% and ultrahigh strength of ~6 GPa, overcoming the trade-off between strength and ductility. These excellent properties originate from profuse hexagonal close-packed (HCP) phase generation (2H and 4H phases), recurrence of reversible FCC-HCP phase transition, and zigzag-like nanotwin generation, which has rarely been reported before. Such a mechanism stems from the inherent chemical inhomogeneity, which leads to widely distributed and overlapping energy barriers for the concurrent activation of multiple plasticity mechanisms. This naturally implies a similar deformation behavior for other highly concentrated solid-solution alloys with multiple principal elements, such as high/medium-entropy alloys. Our findings shed light on the effect of chemical inhomogeneity on the plastic deformation mechanism of solid-solution alloys.

Suggested Citation

  • Chengpeng Yang & Bozhao Zhang & Libo Fu & Zhanxin Wang & Jiao Teng & Ruiwen Shao & Ziqi Wu & Xiaoxue Chang & Jun Ding & Lihua Wang & Xiaodong Han, 2023. "Chemical inhomogeneity–induced profuse nanotwinning and phase transformation in AuCu nanowires," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41485-2
    DOI: 10.1038/s41467-023-41485-2
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    References listed on IDEAS

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