Metallic nanocrystals with low angle grain boundary for controllable plastic reversibility

Qi Zhu, Qishan Huang, Cao Guang, Xianghai An, Scott X. Mao, Wei Yang, Ze Zhang, Huajian Gao, Haofei Zhou () and Jiangwei Wang ()
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Qi Zhu: Zhejiang University
Qishan Huang: Zhejiang University
Cao Guang: Zhejiang University
Xianghai An: The University of Sydney
Scott X. Mao: University of Pittsburgh
Wei Yang: Zhejiang University
Ze Zhang: Zhejiang University
Huajian Gao: Nanyang Technological University
Haofei Zhou: Zhejiang University
Jiangwei Wang: Zhejiang University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Advanced nanodevices require reliable nanocomponents where mechanically-induced irreversible structural damage should be largely prevented. However, a practical methodology to improve the plastic reversibility of nanosized metals remains challenging. Here, we propose a grain boundary (GB) engineering protocol to realize controllable plastic reversibility in metallic nanocrystals. Both in situ nanomechanical testing and atomistic simulations demonstrate that custom-designed low-angle GBs with controlled misorientation can endow metallic bicrystals with endurable cyclic deformability via GB migration. Such fully reversible plasticity is predominantly governed by the conservative motion of Shockley partial dislocation pairs, which fundamentally suppress damage accumulation and preserve the structural stability. This reversible deformation is retained in a broad class of face-centred cubic metals with low stacking fault energies when tuning the GB structure, external geometry and loading conditions over a wide range. These findings shed light on practical advances in promoting cyclic deformability of metallic nanomaterials.

Date: 2020
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DOI: 10.1038/s41467-020-16869-3

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