In situ atomic-scale observation of grain size and twin thickness effect limit in twin-structural nanocrystalline platinum

Lihua Wang, Kui Du, Chengpeng Yang, Jiao Teng, Libo Fu, Yizhong Guo, Ze Zhang () and Xiaodong Han ()
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Lihua Wang: Beijing University of Technology
Kui Du: Chinese Academy of Sciences
Chengpeng Yang: Beijing University of Technology
Jiao Teng: University of Science and Technology Beijing
Libo Fu: Beijing University of Technology
Yizhong Guo: Beijing University of Technology
Ze Zhang: Zhejiang University
Xiaodong Han: Beijing University of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Twin-thickness-controlled plastic deformation mechanisms are well understood for submicron-sized twin-structural polycrystalline metals. However, for twin-structural nanocrystalline metals where both the grain size and twin thickness reach the nanometre scale, how these metals accommodate plastic deformation remains unclear. Here, we report an integrated grain size and twin thickness effect on the deformation mode of twin-structural nanocrystalline platinum. Above a ∼10 nm grain size, there is a critical value of twin thickness at which the full dislocation intersecting with the twin plane switches to a deformation mode that results in a partial dislocation parallel to the twin planes. This critical twin thickness value varies from ∼6 to 10 nm and is grain size-dependent. For grain sizes between ∼10 to 6 nm, only partial dislocation parallel to twin planes is observed. When the grain size falls below 6 nm, the plasticity switches to grain boundary-mediated plasticity, in contrast with previous studies, suggesting that the plasticity in twin-structural nanocrystalline metals is governed by partial dislocation activities.

Date: 2020
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DOI: 10.1038/s41467-020-14876-y

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