Size effects and strength fluctuation in nanoscale plasticity

IMR OpenIR

	Size effects and strength fluctuation in nanoscale plasticity
	W. Wang; Y. Zhong; K. Lu; L. Lu; D. L. McDowell; T. Zhu
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:8 页码:3302-3309
摘要	Stochastic, discontinuous flow is ubiquitous in the plastic deformation of small-volume metallic materials. We have identified a size-strengthening effect on the stress to initiate the jerky plastic yielding in nanoscale volumes of copper single crystals, subjected to nano-indentation in different orientations. Such a nanoscale size effect arises due to the stochastic nature of dislocation sources, in contrast to the microscale size effect often attributed to plastic strain gradients. The jerky response can result from the activation of either surface or bulk heterogeneous dislocation sources, as governed by the distribution and resistance of dislocation locks. Implications concerning the deformation mechanism in materials with flow defect-limited characteristics are discussed. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[zhong, yuan; mcdowell, david l.; zhu, ting] georgia inst & technol, george w woodruff sch mech engn, atlanta, ga 30332 usa. [wang, wei; lu, k.; lu, lei] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [mcdowell, david l.] georgia inst & technol, sch mat sci & engn, atlanta, ga 30332 usa.;zhu, t (reprint author), georgia inst & technol, george w woodruff sch mech engn, atlanta, ga 30332 usa.;ting.zhu@me.gatech.edu
关键词	Nanoindentation Yield Phenomena Dislocation Molecular Dynamics Copper Dislocation Nucleation Incipient Plasticity Crystal Plasticity Nanoindentation Indentation Deformation Surfaces Behavior Scales
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60311
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Wang,Y. Zhong,K. Lu,et al. Size effects and strength fluctuation in nanoscale plasticity[J]. Acta Materialia,2012,60(8):3302-3309.
APA	W. Wang,Y. Zhong,K. Lu,L. Lu,D. L. McDowell,&T. Zhu.(2012).Size effects and strength fluctuation in nanoscale plasticity.Acta Materialia,60(8),3302-3309.
MLA	W. Wang,et al."Size effects and strength fluctuation in nanoscale plasticity".Acta Materialia 60.8(2012):3302-3309.