The transformation of edge dislocation dipoles in aluminium

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	The transformation of edge dislocation dipoles in aluminium
	H. Wang ; D. S. Xu ; R. Yang ; P. Veyssiere
刊名	Acta Materialia
	2008
卷号	56 期号:17 页码:4608-4620
关键词	Dislocation dipole Annihilation Stacking fault tetrahedron Molecular dynamics simulations Reordering stacking-fault tetrahedra nickel single-crystals molecular-dynamics fcc metals dissociated dislocations interatomic potentials room-temperature weak-beam slip al
ISSN号	1359-6454
中文摘要	The transformations of dipoles of dissociated edge dislocations in aluminium are investigated using molecular dynamics for dipole heights ranging from one to ten {111} interplanar distances and at temperatures up to 900 K. Three types of configurations, hollow, vertical compact and inclined dipoles, are considered and their relative stabilities compared. Hollows are unstable at finite temperature. Dipoles neither annihilate nor form stable hollow cores but transform into height- and temperature-dependent layouts including cores containing ordered free Volumes, zigzag faulted dipoles and agglormerated truncated stacking fault tetrahedra (SFT). Small individual SFT are formed at the highest temperatures, attesting to short-range pipe diffusion. These rearranged configurations are strong obstacles to mobile dislocations, thence potential nucleation sites for dislocation entanglement and self-patterning under single slip. A new thermally activated mechanism of SFT formation directly from vacancy clusters resulting from local dipole pinching-off is reported. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
原文出处	://WOS:000260372100008
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/33126]
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	H. Wang,D. S. Xu,R. Yang,et al. The transformation of edge dislocation dipoles in aluminium[J]. Acta Materialia,2008,56(17):4608-4620.
APA	H. Wang,D. S. Xu,R. Yang,&P. Veyssiere.(2008).The transformation of edge dislocation dipoles in aluminium.Acta Materialia,56(17),4608-4620.
MLA	H. Wang,et al."The transformation of edge dislocation dipoles in aluminium".Acta Materialia 56.17(2008):4608-4620.