Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries

doi:10.1088/0965-0393/4/2/009

IMECH-IR > 力学所知识产出(1956-2008)

	Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries
	Zhang YW(张永伟); Wang ZQ(王自强); Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA.
发表期刊	Modelling and Simulation in Materials Science and Engineering
	1996
卷号	4 期号:2 页码:231-244
ISSN	0965-0393
摘要	The interaction of a dislocation array emitted from a crack tip under mode II loading with asymmetric tilt grain boundaries (GBs) is analysed by the molecular dynamics method. The GBs can generally be described by planar and linear matching zones and unmatching zones. All GBs are observed to emit dislocations. The GBs migrated easily due to their planar and linear matching structure and asymmetrical type. The diffusion induced by stress concentration is found to promote the GB migration. The transmissions of dislocations are either along the matched plane or along another plane depending on tilt angle theta. Alternate processes of stress concentration and stress relaxation take place ahead of the pileup. The stress concentration can be released either by transmission of dislocations, by atom diffusion along GBs, or by migration of GBs by formation of twinning bands. The simulated results also unequivocally demonstrate two processes, i.e. asymmetrical GBs evolving into symmetrical ones and unmatching zones evolving into matching ones during the loading process.
关键词	Brittle-ductile Transition Computer-simulation Tilt Boundaries Deformation Fracture Metals Model Dissociation Migration
DOI	10.1088/0965-0393/4/2/009
收录类别	SCI
语种	英语
WOS记录号	WOS:A1996UM92100009
关键词[WOS]	BRITTLE-DUCTILE TRANSITION ; COMPUTER-SIMULATION ; TILT BOUNDARIES ; DEFORMATION ; FRACTURE ; METALS ; MODEL ; DISSOCIATION ; MIGRATION
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/39136
专题	力学所知识产出(1956-2008)
通讯作者	Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA.
推荐引用方式 GB/T 7714	Zhang YW,Wang ZQ,Zhang, YW . Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries[J]. Modelling and Simulation in Materials Science and Engineering,1996,4,2,:231-244.
APA	张永伟,王自强,&Zhang, YW .(1996).Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries.Modelling and Simulation in Materials Science and Engineering,4(2),231-244.
MLA	张永伟,et al."Molecular dynamics simulation of interaction of a dislocation array from a crack tip with grain boundaries".Modelling and Simulation in Materials Science and Engineering 4.2(1996):231-244.

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