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

被引：30

作者：

Hwang, Byungil ^{[1
]}

Kang, Mijeong ^{[2
]}

Lee, Subin ^{[3
]}

Weinberger, Christopher R. ^{[4
]}

Loya, Phillip ^{[5
]}

Lou, Jun ^{[5
]}

Oh, Sang Ho ^{[3
]}

Kim, Bongsoo ^{[2
]}

Han, Seung Min ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Grad Sch Energy Environm Water & Sustainabil, Taejon, 305701, South Korea

[2] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea

[3] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 790784, South Korea

[4] Drexel Univ, Dept Mech Engn & Mech, Philadelphia, PA 19104 USA

[5] Rice Univ, Dept Mat Sci & Nano Engn, Houston, TX 77005 USA

来源：

NANOSCALE | 2015年 / 7卷 / 38期

基金：

新加坡国家研究基金会;

关键词：

ULTRAHIGH-STRENGTH; DISLOCATION NUCLEATION; PLASTICITY; MECHANISMS; FRACTURE;

D O I：

10.1039/c5nr03902a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：15657 / 15664

页数：8

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