Size-dependent dislocation–twin interactions

Wang, Jiangwei; Cao, Guang; Zhang, Ze; Sansoz, Frederic

doi:10.1039/c9nr03637g

Size-dependent dislocation–twin interactions

Journal Article · Mon Jun 17 00:00:00 EDT 2019 · Nanoscale

DOI:https://doi.org/10.1039/c9nr03637g· OSTI ID:1601109

^[1]; Cao, Guang ^[2]; Zhang, Ze ^[2]; ^[3]

Zhejiang Univ., Hangzhou (China); The University of Vermont
Zhejiang Univ., Hangzhou (China)
Univ. of Vermont, Burlington, VT (United States)

Dislocation–twin interactions critically control the plastic deformation and ultrahigh strength of nanotwinned metals. In this paper, we report a strong twin-thickness dependence of dislocation–twin interaction mechanisms from the tensile deformation of face-centered cubic metallic nanocrystals by in situ nanomechanical testing. Direct observations at atomic scale reveal that the predominant dislocation–twin interaction abruptly changes from dislocation transmission on the {111} slip planes to the unusual (100) slip plane of the twin, when the twin thickness is smaller than 4 layers. Using atomistic simulations, we find that the energy barrier for {100} slip transmission mechanism gradually decreases, with decreasing twin thickness, below the energy level required for normal (111) slip transmission, which remains identical for all twin sizes. Our in situ observations and simulations provide atomistic insights into a fundamentally new mechanism of plasticity in nanotwinned metals, down to the lowest twin size limit.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Vermont, Burlington, VT (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Zhejiang Kechuang New Materials Research Institute

Grant/Contract Number:: SC0016270

OSTI ID:: 1601109

Alternate ID(s):: OSTI ID: 1529418

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 26 Vol. 11; ISSN NANOHL; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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