Sliding of coherent twin boundaries

Zhang-Jie Wang, Qing-Jie Li, Yao Li, Long-Chao Huang, Lei Lu, Ming Dao (), Ju Li, Evan Ma (), Subra Suresh and Zhi-Wei Shan ()
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Zhang-Jie Wang: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Qing-Jie Li: Johns Hopkins University
Yao Li: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Long-Chao Huang: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Lei Lu: Institute of Metal Research, Chinese Academy of Sciences
Ming Dao: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Ju Li: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Evan Ma: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Subra Suresh: Nanyang Technological University
Zhi-Wei Shan: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Coherent twin boundaries (CTBs) are internal interfaces that can play a key role in markedly enhancing the strength of metallic materials while preserving their ductility. They are known to accommodate plastic deformation primarily through their migration, while experimental evidence documenting large-scale sliding of CTBs to facilitate deformation has thus far not been reported. We show here that CTB sliding is possible whenever the loading orientation enables the Schmid factors of leading and trailing partial dislocations to be comparable to each other. This theoretical prediction is confirmed by real-time transmission electron microscope experimental observations during uniaxial deformation of copper pillars with different orientations and is further validated at the atomic scale by recourse to molecular dynamics simulations. Our findings provide mechanistic insights into the evolution of plasticity in heavily twinned face-centered cubic metals, with the potential for optimizing mechanical properties with nanoscale CTBs in material design.

Date: 2017
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DOI: 10.1038/s41467-017-01234-8

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