Revealing extreme twin-boundary shear deformability in metallic nanocrystals

Zhu, Qi; Kong, Lingyi; Lu, Haiming; Huang, Qishan; Chen, Yingbin; Liu, Yue; Yang, Wei; Zhang, Ze; Sansoz, Frederic; Zhou, Haofei; Wang, Jiangwei

doi:10.1126/sciadv.abe4758

Title: Revealing extreme twin-boundary shear deformability in metallic nanocrystals

Journal Article · 31 August 2021 · Science Advances

DOI: https://doi.org/10.1126/sciadv.abe4758 · OSTI ID:1852171

^[1]; Kong, Lingyi ^[2]; Lu, Haiming ^[2];

^[2]; Chen, Yingbin ^[2];

^[3]; Yang, Wei ^[2];

^[2];

^[4];

^[2];

^[5]

Zhejiang Univ., Hangzhou (China); Zhejiang Univ., Hangzhou (China)
Zhejiang Univ., Hangzhou (China)
Shanghai Jiao Tong Univ., Shanghai (China)
Univ. of Vermont, Burlington, VT (United States)
Zhejiang Univ., Hangzhou (China); Zhejiang Univ., Wenzhou (China)

Metals containing abundant coherent twin boundaries (TBs) are able to sustain substantial plastic deformation without fracture due to shear-induced TB migration and sliding. Retaining ductility in these metals, however, has proven difficult because detwinning rapidly exhausts TB migration mechanisms at large deformation, whereas TB sliding was only evidenced for loading on very specific crystallographic orientations. Here, we reveal the intrinsic shear deformability of twins in nanocrystals using in situ nanomechanical testing and multiscale simulations and report extreme shear deformability through TB sliding up to 364%. Sliding-induced plasticity is manifested for orientations that are generally predicted to favor detwinning and shown to depend critically on geometric inhomogeneities. Normal and shear coupling are further examined to delineate a TB orientation-dependent transition from TB sliding to TB cracking. These dynamic observations reveal unprecedented mechanical properties in nanocrystals, which hold implications for improving metal processing by severe plastic deformation.

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Research Organization:: Univ. of Vermont, Burlington, VT (United States); Zhejiang Univ., Hangzhou (China)

Sponsoring Organization:: National Natural Science Foundation of China; National Science Foundation (NSF); USDOE Office of Science (SC); Zhejiang Kechuang New Materials Research Institute

Grant/Contract Number:: SC0016270; SC0020054

OSTI ID:: 1852171

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 36 Vol. 7; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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