Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowires. Issue 38 (9th September 2015)

• Record Type: Journal Article
• Authors: Hwang, Byungil; Kang, Mijeong; Lee, Subin; Weinberger, Christopher R.; Loya, Phillip; Lou, Jun; Oh, Sang Ho; Kim, Bongsoo; Han, Seung Min
• Is Part Of: Nanoscale. Volume 7:Issue 38(2015)
• Page Start: 15657
• Page End: 15664
• Publication Date: 2015-09-09
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr03902a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : 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. Abstract : 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 ∼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.