Size effects on elasticity, yielding, and fracture of silver nanowires: In situ experiments

被引：265

作者：

Zhu, Yong ^{[1
]}

Qin, Qingquan ^{[1
]}

Xu, Feng ^{[1
]}

Fan, Fengru ^{[2
]}

Ding, Yong ^{[2
]}

Zhang, Tim ^{[3
]}

Wiley, Benjamin J. ^{[3
]}

Wang, Zhong Lin ^{[2
]}

机构：

[1] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA

[2] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[3] Duke Univ, Dept Chem, Durham, NC 27708 USA

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 04期

关键词：

ELECTRON-MICROSCOPY; ZNO NANOWIRES; STRENGTH; DEFORMATION; COMPRESSION; SCALE;

D O I：

10.1103/PhysRevB.85.045443

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper reports the quantitative measurement of a full spectrum ofmechanical properties of fivefold twinned silver (Ag) nanowires (NWs), including Young's modulus, yield strength, and ultimate tensile strength. In-situ tensile testing of Ag NWs with diameters between 34 and 130 nm was carried out inside a scanning electron microscope (SEM). Young's modulus, yield strength, and ultimate tensile strength all increased as the NW diameter decreased. The maximum yield strength in our tests was found to be 2.64 GPa, which is about 50 times the bulk value and close to the theoretical value of Ag in the < 110 > orientation. The size effect in the yield strength is mainly due to the stiffening size effect in the Young's modulus. Yield strain scales reasonably well with the NW surface area, which reveals that yielding of Ag NWs is due to dislocation nucleation from surface sources. Pronounced strain hardening was observed for most NWs in our study. The strain hardening, which has not previously been reported for NWs, is mainly attributed to the presence of internal twin boundaries.

引用

页数：7

共 53 条

[1] Elasticity Size Effects in ZnO Nanowires-A Combined Experimental-Computational Approach [J].

Agrawal, Ravi ;

Peng, Bei ;

Gdoutos, Eleftherios E. ;

Espinosa, Horacio D. .

NANO LETTERS, 2008, 8 (11) :3668-3674

[2] Experimental-Computational Investigation of ZnO nanowires Strength and Fracture [J].

Agrawal, Ravi ;

Peng, Bei ;

Espinosa, Horacio D. .

NANO LETTERS, 2009, 9 (12) :4177-4183

[3] TENSILE STRENGTH OF WHISKERS [J].

BRENNER, SS .

JOURNAL OF APPLIED PHYSICS, 1956, 27 (12) :1484-1491

[4] Atomistic simulations of the mechanical behavior of fivefold twinned nanowires [J].

Cao, Ajing ;

Wei, Yueguang .

PHYSICAL REVIEW B, 2006, 74 (21)

[5] Seedless, surfactantless wet chemical synthesis of silver nanowires [J].

Caswell, KK ;

Bender, CM ;

Murphy, CJ .

NANO LETTERS, 2003, 3 (05) :667-669

[6] Size dependence of Young's modulus in ZnO nanowires [J].

Chen, CQ ;

Shi, Y ;

Zhang, YS ;

Zhu, J ;

Yan, YJ .

PHYSICAL REVIEW LETTERS, 2006, 96 (07)

[7] Transmission-electron-microscopy study on fivefold twinned silver nanorods [J].

Chen, HY ;

Gao, Y ;

Zhang, HR ;

Liu, LB ;

Yu, HC ;

Tian, HF ;

Xie, SS ;

Li, JQ .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (32) :12038-12043

[8]

Courtney T.H., 2000, MECH BEHAV MAT, P59

[9] Surface tension effect on the mechanical properties of nanomaterials measured by atomic force microscopy -: art. no. 165410 [J].

Cuenot, S ;

Frétigny, C ;

Demoustier-Champagne, S ;

Nysten, B .

PHYSICAL REVIEW B, 2004, 69 (16) :165410-1

[10] Enabling Ultrahigh Plastic Flow and Work Hardening in Twinned Gold Nanowires [J].

Deng, Chuang ;

Sansoz, Frederic .

NANO LETTERS, 2009, 9 (04) :1517-1522

← 1 2 3 4 5 6 →