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

Zhang, Zijiao ; Sheng, Hongwei ; Wang, Zhangjie ; Gludovatz, Bernd ; Zhang, Ze ; George, Easo P ; Yu, Qian ; Mao, Scott X ; Ritchie, Robert O

Nature communications, 2017-02, Vol.8 (1), p.14390-14390, Article 14390 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy
  • Autor: Zhang, Zijiao ; Sheng, Hongwei ; Wang, Zhangjie ; Gludovatz, Bernd ; Zhang, Ze ; George, Easo P ; Yu, Qian ; Mao, Scott X ; Ritchie, Robert O
  • Assuntos: Alloys ; Approximation ; Deformation ; Ductility ; Energy ; Engineering ; Entropy ; MATERIALS SCIENCE ; Mechanical properties ; Microscopy ; Nanoscience and technology ; Structural materials
  • É parte de: Nature communications, 2017-02, Vol.8 (1), p.14390-14390, Article 14390
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC05-00OR22725; AC02-05CH11231; DMR-1611064; 2015CB65930
    National Science Foundation (NSF)
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
    State Key Program for Basic Research in China
  • Descrição: 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.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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