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Evading the strength–ductility trade-off dilemma in steel through gradient hierarchical nanotwins

Author

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  • Yujie Wei

    (LNM, Institute of Mechanics, Chinese Academy of Sciences)

  • Yongqiang Li

    (LNM, Institute of Mechanics, Chinese Academy of Sciences)

  • Lianchun Zhu

    (LNM, Institute of Mechanics, Chinese Academy of Sciences)

  • Yao Liu

    (LNM, Institute of Mechanics, Chinese Academy of Sciences)

  • Xianqi Lei

    (LNM, Institute of Mechanics, Chinese Academy of Sciences)

  • Gang Wang

    (Laboratory for Microstructures, Shanghai University)

  • Yanxin Wu

    (National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing)

  • Zhenli Mi

    (National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing)

  • Jiabin Liu

    (Institute of Applied Mechanics, Zhejiang University)

  • Hongtao Wang

    (Institute of Applied Mechanics, Zhejiang University)

  • Huajian Gao

    (School of Engineering, Brown University)

Abstract

The strength–ductility trade-off has been a long-standing dilemma in materials science. This has limited the potential of many structural materials, steels in particular. Here we report a way of enhancing the strength of twinning-induced plasticity steel at no ductility trade-off. After applying torsion to cylindrical twinning-induced plasticity steel samples to generate a gradient nanotwinned structure along the radial direction, we find that the yielding strength of the material can be doubled at no reduction in ductility. It is shown that this evasion of strength–ductility trade-off is due to the formation of a gradient hierarchical nanotwinned structure during pre-torsion and subsequent tensile deformation. A series of finite element simulations based on crystal plasticity are performed to understand why the gradient twin structure can cause strengthening and ductility retention, and how sequential torsion and tension lead to the observed hierarchical nanotwinned structure through activation of different twinning systems.

Suggested Citation

  • Yujie Wei & Yongqiang Li & Lianchun Zhu & Yao Liu & Xianqi Lei & Gang Wang & Yanxin Wu & Zhenli Mi & Jiabin Liu & Hongtao Wang & Huajian Gao, 2014. "Evading the strength–ductility trade-off dilemma in steel through gradient hierarchical nanotwins," Nature Communications, Nature, vol. 5(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4580
    DOI: 10.1038/ncomms4580
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    Cited by:

    1. Yao Tang & Haofei Zhou & Haiming Lu & Xiaodong Wang & Qingping Cao & Dongxian Zhang & Wei Yang & Jian-Zhong Jiang, 2022. "Extra plasticity governed by shear band deflection in gradient metallic glasses," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. 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.

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