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Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy

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Listed:
  • Zijiao Zhang

    (Center of Electron Microscopy & State Key Laboratory of Silicon Materials, Zhejiang University)

  • Hongwei Sheng

    (George Mason University)

  • Zhangjie Wang

    (Xi’an Jiaotong University)

  • Bernd Gludovatz

    (Lawrence Berkeley National Laboratory)

  • Ze Zhang

    (Center of Electron Microscopy & State Key Laboratory of Silicon Materials, Zhejiang University)

  • Easo P. George

    (Oak Ridge National Laboratory)

  • Qian Yu

    (Center of Electron Microscopy & State Key Laboratory of Silicon Materials, Zhejiang University)

  • Scott X. Mao

    (Center of Electron Microscopy & State Key Laboratory of Silicon Materials, Zhejiang University
    University of Pittsburgh)

  • Robert O. Ritchie

    (Lawrence Berkeley National Laboratory
    University of California)

Abstract

Combinations of high strength and ductility are hard to attain in metals. Exceptions include materials exhibiting twinning-induced plasticity. To understand how the strength-ductility trade-off can be defeated, we apply in situ, and aberration-corrected scanning, transmission electron microscopy to examine deformation mechanisms in the medium-entropy alloy CrCoNi that exhibits one of the highest combinations of strength, ductility and toughness on record. Ab initio modelling suggests that it has negative stacking-fault energy at 0K and high propensity for twinning. With deformation we find that a three-dimensional (3D) hierarchical twin network forms from the activation of three twinning systems. This serves a dual function: conventional twin-boundary (TB) strengthening from blockage of dislocations impinging on TBs, coupled with the 3D twin network which offers pathways for dislocation glide along, and cross-slip between, intersecting TB-matrix interfaces. The stable twin architecture is not disrupted by interfacial dislocation glide, serving as a continuous source of strength, ductility and toughness.

Suggested Citation

  • Zijiao Zhang & Hongwei Sheng & Zhangjie Wang & Bernd Gludovatz & Ze Zhang & Easo P. George & Qian Yu & Scott X. Mao & Robert O. Ritchie, 2017. "Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14390
    DOI: 10.1038/ncomms14390
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    Cited by:

    1. Yang Yang & Sheng Yin & Qin Yu & Yingxin Zhu & Jun Ding & Ruopeng Zhang & Colin Ophus & Mark Asta & Robert O. Ritchie & Andrew M. Minor, 2024. "Rejuvenation as the origin of planar defects in the CrCoNi medium entropy alloy," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Xizheng Wang & Yunhao Zhao & Gang Chen & Xinpeng Zhao & Chuan Liu & Soumya Sridar & Luis Fernando Ladinos Pizano & Shuke Li & Alexandra H. Brozena & Miao Guo & Hanlei Zhang & Yuankang Wang & Wei Xiong, 2022. "Ultrahigh-temperature melt printing of multi-principal element alloys," Nature Communications, Nature, vol. 13(1), pages 1-8, 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. Li Zhong & Yin Zhang & Xiang Wang & Ting Zhu & Scott X. Mao, 2024. "Atomic-scale observation of nucleation- and growth-controlled deformation twinning in body-centered cubic nanocrystals," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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