Nucleation-Controlled Distributed Plasticity in Penta-twinned Silver Nanowires

被引：103

作者：

Filleter, Tobin ^{[1
]}

Ryu, Seunghwa ^{[2
]}

Kang, Keonwook ^{[2
]}

Yin, Jie ^{[2
]}

Bernal, Rodrigo A. ^{[1
]}

Sohn, Kwonnam ^{[3
]}

Li, Shuyou ^{[1
]}

Huang, Jiaxing ^{[3
]}

Cai, Wei ^{[2
]}

Espinosa, Horacio D. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Mech Engn, Evanston, IL 60208 USA

[2] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA

[3] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

SMALL | 2012年 / 8卷 / 19期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

metallic nanowires; mechanical properties; plasticity; twin-boundaries; in-situ TEM testing; ULTRAHIGH-STRENGTH; MECHANICAL-PROPERTIES; GOLD; DEFORMATION; STRESS; GROWTH; SCALE; FLOW;

D O I：

10.1002/smll.201200522

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A unique size-dependent strain hardening mechanism, that achieves both high strength and ductility, is demonstrated for penta-twinned Ag nanowires (NWs) through a combined experimental-computational approach. Thin Ag NWs are found to deform via the surface nucleation of stacking fault decahedrons (SFDs) in multiple plastic zones distributed along the NW. Twin boundaries lead to the formation of SFD chains that locally harden the NW and promote subsequent nucleation of SFDs at other locations. Due to surface undulations, chain reactions of SFD arrays are activated at stress concentrations and terminated as local stress decreases, revealing insensitivity to defects imparted by the twin structures. Thick NWs exhibit lower flow stress and number of distributed plastic zones due to the onset of necking accompanied by more complex dislocation structures.

引用

页码：2986 / 2993

页数：8

共 49 条

[11] Ultrahigh Strength and Stiffness in Cross-Linked Hierarchical Carbon Nanotube Bundles [J].

Filleter, T. ;

Bernal, R. ;

Li, S. ;

Espinosa, H. D. .

ADVANCED MATERIALS, 2011, 23 (25) :2855-+

[12]

FOILES SM, 1986, PHYS REV B, V33, P7983, DOI 10.1103/PhysRevB.33.7983

[13]

Green JA, 2006, ARTHRITIS RHEUM-US, V54, P1705, DOI [10.1002/art.21799, 10.1016/j.actamat.2005.12.004]

[14] Plasticity in small-sized metallic systems: Intrinsic versus extrinsic size effect [J].

Greer, Julia R. ;

De Hosson, Jeff Th. M. .

PROGRESS IN MATERIALS SCIENCE, 2011, 56 (06) :654-724

[15] Ultrahigh Strain Hardening in Thin Palladium Films with Nanoscale Twins [J].

Idrissi, Hosni ;

Wang, Binjie ;

Colla, Marie Stephane ;

Raskin, Jean Pierre ;

Schryvers, Dominique ;

Pardoen, Thomas .

ADVANCED MATERIALS, 2011, 23 (18) :2119-+

[16] Influence of Homogeneous Interfaces on the Strength of 500 nm Diameter Cu Nanopillars [J].

Jang, Dongchan ;

Cai, Can ;

Greer, Julia R. .

NANO LETTERS, 2011, 11 (04) :1743-1746

[17] Surface effects on elastic properties of silver nanowires: Contact atomic-force microscopy [J].

Jing, G. Y. ;

Duan, H. L. ;

Sun, X. M. ;

Zhang, Z. S. ;

Xu, J. ;

Li, Y. D. ;

Wang, J. X. ;

Yu, D. P. .

PHYSICAL REVIEW B, 2006, 73 (23)

[18] Growth and form of gold nanorods prepared by seed-mediated, surfactant-directed synthesis [J].

Johnson, CJ ;

Dujardin, E ;

Davis, SA ;

Murphy, CJ ;

Mann, S .

JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (06) :1765-1770

[19]

Kim B., 2011, NANO LETT, V11, P3499

[20] Deformation of top-down and bottom-up silver nanowires [J].

Leach, Austin M. ;

McDowell, Matt ;

Gall, Ken .

ADVANCED FUNCTIONAL MATERIALS, 2007, 17 (01) :43-53

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