Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowires

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In this study, we report the size-dependent transition of deformation twinning studied using in situ SEM/TEM tensile testing of defect-free [110] Au nanowires/ribbons with controlled geometry. The critical dimension below which the ordinary plasticity transits to deformation twinning is experimentally determined to be similar to 170 nm for Au nanowires with equilateral cross-sections. Nanoribbons with a fixed thickness but increased width-to-thickness ratios (9 : 1) were also studied to show that an increase in the surface energy due to the crystal re-orientation suppresses the deformation twinning. Molecular dynamics simulations confirmed that the transition from partial dislocation mediated plasticity to perfect dislocation plasticity with increase in the width-to-thickness ratio is due to the effect of the surface energy.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2015-10
Language
English
Article Type
Article
Citation

NANOSCALE, v.7, no.38, pp.15657 - 15664

ISSN
2040-3364
DOI
10.1039/c5nr03902a
URI
http://hdl.handle.net/10203/205585
Appears in Collection
CH-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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