Anisotropic size effect in strength in coherent nanowires with tilted twins

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	Anisotropic size effect in strength in coherent nanowires with tilted twins
	Wei YJ(魏宇杰)
刊名	Physical Review B
	2011
通讯作者邮箱	yujie_wei@lnm.imech.ac.cn
卷号	84 期号:1 页码:14107
关键词	Single-Crystal Mechanical-Properties Molecular-Dynamics Maximum Strength Gold Nanowires Deformation Metals Copper Microcompression Plasticity
ISSN号	1098-0121
通讯作者	Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
产权排序	Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
中文摘要	When materials are deformed plastically via dislocations, a general finding is that samples with smaller dimensions exhibit higher strengths but with very limited amount of plasticity in tension. Here we report that one-dimensional coherent nanostructures with tilted internal twins exhibit anisotropic size effect: their strengths show no apparent change if only their thicknesses reduce, but become stronger as the sample sizes are reduced proportionally. Large-scale molecular dynamics simulations show that such nanowires deform primarily through twin migration mediated by partial dislocations in one active slip system, and a large amount of plasticity could be achieved in such nanowires via twin migration. The unique structure shown here is suitable to explore strengthening mechanisms in metals when plasticity is controlled by a single dislocation slip system. This study also suggests a novel approach to modulate strength and ductility in one-dimensional coherent nanostructures.
学科主题	Physics
分类号	二类/Q1
类目[WOS]	Physics, Condensed Matter
研究领域[WOS]	Physics
关键词[WOS]	SINGLE-CRYSTAL ; MECHANICAL-PROPERTIES ; MOLECULAR-DYNAMICS ; MAXIMUM STRENGTH ; GOLD NANOWIRES ; DEFORMATION ; METALS ; COPPER ; MICROCOMPRESSION ; PLASTICITY
收录类别	SCI
资助信息	The author is very grateful to Huajian Gao and Allan F. Bower of Brown University for fruitful discussions. This work was supported in part by the Hundred Talent Program and by NSFC No. 11021262. Computation was supported by the Super Computing Center of CAS and the Institute of Mechanics.
原文出处	http://dx.doi.org/10.1103/PhysRevB.84.014107
语种	英语
WOS记录号	WOS:000293004800001
公开日期	2012-04-01
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/44918]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Wei YJ. Anisotropic size effect in strength in coherent nanowires with tilted twins[J]. Physical Review B,2011,84(1):14107.
APA	魏宇杰.(2011).Anisotropic size effect in strength in coherent nanowires with tilted twins.Physical Review B,84(1),14107.
MLA	魏宇杰."Anisotropic size effect in strength in coherent nanowires with tilted twins".Physical Review B 84.1(2011):14107.