Layer thickness dependent tensile deformation mechanisms in sub-10nm multilayer nanowires

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	Layer thickness dependent tensile deformation mechanisms in sub-10nm multilayer nanowires
	Yuan FP(袁福平); Wu XL(武晓雷); Yuan, FP
刊名	JOURNAL OF APPLIED PHYSICS
	2012-06-15
通讯作者邮箱	fpyuan@lnm.imech.ac.cn
卷号	111 期号:12 页码:124313
关键词	Gold Nanowires Metal Nanowires Atomistic Simulations Phase-Transformation Molecular-Dynamics Ultrahigh-Strength Yield Strength Single-Crystal Interfaces Stress
ISSN号	0021-8979
通讯作者	Yuan, FP ; Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China.
产权排序	[Yuan, Fuping;Wu, Xiaolei] Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China
中文摘要	Using molecular dynamics simulations, the tensile deformation behavior for two types of sub- 10 nm multilayer nanowires (NWs) have been investigated. For the structure with interfaces perpendicular to the wire axis, the deformation mechanism is changed from interface crossing by dislocations to interface rotation as the layer thickness is decreasing, causing a significant reduction in yield strength. However, the deformation mechanisms are all accommodated through interface crossing by dislocations regardless of layer thickness for the structure with interfaces parallel to the wire axis. Moreover, the yield strengths in the second structure are found to be controlled by two competing mechanisms: the interface strengthening by increased repulsive force and interface softening by increased dislocation source sites. The sudden stress drop after yielding point in NWs could be explained by the dislocation source- limited hardening mechanism: the more atomic fraction of newly formed stacking faults (SF) after stress drop, the larger normalized stress drop and the larger uniform tensile elongation. For the second structure, the larger total tensile elongation for larger layer thickness could be related to the twinning induced plasticity at the necking position. These findings should have implications for designing functionalized structures and devices in nanoelectromechanical systems.
学科主题	损伤、破坏机理和微结构演化
分类号	二类/Q2
收录类别	SCI ; EI
资助信息	The authors would like to acknowledge the financial support of 973 Program of China (Nos. 2012CB932203 and 2012CB937500) and NSFC (Grant Nos. 11002151 and 11072243).
原文出处	http://dx.doi.org/10.1063/1.4730337
语种	英语
WOS记录号	WOS:000305832100122
公开日期	2013-01-18
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/46706]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Yuan, FP
推荐引用方式 GB/T 7714	Yuan FP,Wu XL,Yuan, FP. Layer thickness dependent tensile deformation mechanisms in sub-10nm multilayer nanowires[J]. JOURNAL OF APPLIED PHYSICS,2012,111(12):124313.
APA	袁福平,武晓雷,&Yuan, FP.(2012).Layer thickness dependent tensile deformation mechanisms in sub-10nm multilayer nanowires.JOURNAL OF APPLIED PHYSICS,111(12),124313.
MLA	袁福平,et al."Layer thickness dependent tensile deformation mechanisms in sub-10nm multilayer nanowires".JOURNAL OF APPLIED PHYSICS 111.12(2012):124313.