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

IMR OpenIR

	The transformation of narrow dislocation dipoles in selected fcc metals and in gamma-TiAl
	H. Wang; D. S. Xu; R. Yang; P. Veyssiere
	2009
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	57 期号:13 页码:3725-3737
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.
部门归属	[wang, h.; xu, d. s.; yang, r.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [wang, h.] chinese acad sci, grad sch, beijing 100039, peoples r china. [veyssiere, p.] off natl etud & rech aerosp, cnrs, lem, f-92322 chatillon, france.;xu, ds (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;dsxu@imr.ac.cn
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
URL	查看原文
WOS记录号	WOS:000268414100005
引用统计	被引频次：33[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32350
专题	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.