Enabling Ultrahigh Plastic Flow and Work Hardening in Twinned Gold Nanowires

被引：126

作者：

Deng, Chuang

Sansoz, Frederic ^{[1
]}

机构：

[1] Univ Vermont, Sch Engn, Burlington, VT 05405 USA

来源：

NANO LETTERS | 2009年 / 9卷 / 04期

基金：

美国国家科学基金会;

关键词：

CRYSTAL METAL NANOWIRES; STRAIN-RATE SENSITIVITY; CENTERED-CUBIC METALS; MOLECULAR-DYNAMICS; NANOSCALE TWINS; AU NANOWIRES; STRENGTH; BOUNDARIES; COPPER; DISLOCATIONS;

D O I：

10.1021/nl803553b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

By using molecular dynamics simulations, we show that significant strain hardening and ultrahigh flow stresses are enabled in gold nanowires containing coherent (111) growth twins when balancing nanowire diameter and twin boundary spacing at the nanoscale. A fundamental transition in mechanical behavior occurs when the ratio of diameter to twin boundary spacing is larger than 2.14. A model based on site-specific dislocation nucleation and cross-slip mechanisms is proposed to explain the size dependence of flow behavior in twinned nanowires under tensile loading.

引用

收藏

页码：1517 / 1522

页数：6

相关论文

共 35 条

[21] FAST PARALLEL ALGORITHMS FOR SHORT-RANGE MOLECULAR-DYNAMICS [J].

PLIMPTON, S .

JOURNAL OF COMPUTATIONAL PHYSICS, 1995, 117 (01) :1-19

[22] An atomistic perspective on twinning phenomena in nano-enhanced fcc metals [J].

Sansoz, Frederic ;

Huang, Hanchen ;

Warner, Derek H. .

JOM, 2008, 60 (09) :79-84

[23]

Seeger A., 1957, Dislocations and Mechanical Properties of Crystals, P243

[24] Mechanical annealing and source-limited deformation in submicrometre-diameter Ni crystals [J].

Shan, Z. W. ;

Mishra, Raja K. ;

Asif, S. A. Syed ;

Warren, Oden L. ;

Minor, Andrew M. .

NATURE MATERIALS, 2008, 7 (02) :115-119

[25] Theory of shear banding in metallic glasses and molecular dynamics calculations [J].

Shimizu, Futoshi ;

Ogata, Shigenobu ;

Li, Ju .

MATERIALS TRANSACTIONS, 2007, 48 (11) :2923-2927

[26] Electrochemical growth of single-crystal metal nanowires via a two-dimensional nucleation and growth mechanism [J].

Tian, ML ;

Wang, JU ;

Kurtz, J ;

Mallouk, TE ;

Chan, MHW .

NANO LETTERS, 2003, 3 (07) :919-923

[27] Size effects in the deformation of sub-micron Au columns [J].

Volkert, C. A. ;

Lilleodden, E. T. .

PHILOSOPHICAL MAGAZINE, 2006, 86 (33-35) :5567-5579

[28] Ultrathin Au nanowires and their transport properties [J].

Wang, Chao ;

Hu, Yongjie ;

Lieber, Charles M. ;

Sun, Shouheng .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (28) :8902-+

[29] Microtwinning in template-synthesized single-crystal metal nanowires [J].

Wang, JG ;

Tian, ML ;

Mallouk, TE ;

Chan, MHW .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (03) :841-845

[30] Novel deformation mechanism of twinned nanowires [J].

Wang, Jian ;

Huang, Hanchen .

APPLIED PHYSICS LETTERS, 2006, 88 (20)

← 1 2 3 4 →