The transformation of narrow dislocation dipoles in selected fcc metals and in gamma-TiAl

CORC > 金属研究所 > 中国科学院金属研究所

	The transformation of narrow dislocation dipoles in selected fcc metals and in gamma-TiAl
	H. Wang ; D. S. Xu ; R. Yang ; P. Veyssiere
刊名	Acta Materialia
	2009
卷号	57 期号:13 页码:3725-3737
关键词	Dislocation dipole Pipe diffusion Stacking fault tetrahedron Molecular dynamics simulations Faulted dipole copper single-crystals stacking-fault energy transmission electron-microscopy weak-beam interatomic potentials fatigued copper core structures slip deformation dynamics
ISSN号	1359-6454
中文摘要	Transformation of vacancy dipoles of dissociated edge dislocations are analyzed in Cu, Ni and gamma-TiAl by molecular dynamics. Dipole heights up to 20 [111] interplanar distances are investigated at temperatures ranging from 0 K to near the melting points of Cu and Ni and slightly below the upper boundary of the single phase gamma-TiAl domain. Three model configurations, hollows, vertical compact and inclined dipoles, are considered and their relative stabilities compared. Except for dipoles one interplanar distance high, hollows are either metastable or unstable and they are never formed by mutually approaching dipolar dislocations. The three configurations transform into a variety of height- and temperature-dependent layouts including cores containing ordered free volumes, zigzagged faulted dipoles and agglomerated stacking-fault tetrahedra (SFT). At the highest temperatures, small individual SFTs are formed by short-range pipe-diffusion along the dipole cores. There is no critical height below which small-height dipoles or their debris would just simply disappear. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
原文出处	://WOS:000268414100005
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/32350]
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 narrow dislocation dipoles in selected fcc metals and in gamma-TiAl[J]. Acta Materialia,2009,57(13):3725-3737.
APA	H. Wang,D. S. Xu,R. Yang,&P. Veyssiere.(2009).The transformation of narrow dislocation dipoles in selected fcc metals and in gamma-TiAl.Acta Materialia,57(13),3725-3737.
MLA	H. Wang,et al."The transformation of narrow dislocation dipoles in selected fcc metals and in gamma-TiAl".Acta Materialia 57.13(2009):3725-3737.