Size effects and strength fluctuation in nanoscale plasticity

CORC > 金属研究所 > 中国科学院金属研究所

	Size effects and strength fluctuation in nanoscale plasticity
	W. Wang ; Y. Zhong ; K. Lu ; L. Lu ; D. L. McDowell ; T. Zhu
刊名	Acta Materialia
	2012
卷号	60 期号:8 页码:3302-3309
关键词	Nanoindentation Yield phenomena Dislocation Molecular dynamics Copper dislocation nucleation incipient plasticity crystal plasticity nanoindentation indentation deformation surfaces behavior scales
ISSN号	1359-6454
中文摘要	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.
原文出处	://WOS:000304020300007
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/60311]
专题	金属研究所_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.