Molecular dynamics studies on the dislocation gliding near a tilt boundary

IMECH-IR > 力学所知识产出(1956-2008)

	Molecular dynamics studies on the dislocation gliding near a tilt boundary
	Chen ZY(陈致英); Chen, ZY (reprint author), ACAD SINICA,INST MECH,BEIJING 100080,PEOPLES R CHINA.
发表期刊	Acta Mechanica Sinica
	1996
卷号	12 期号:1 页码:73-84
ISSN	0567-7718
摘要	The gliding behavior of edge dislocation near a grain boundary(QB) in copper under pure shear stresses is simulated by using molecular dynamics(MD) method. Many-body potential incorporating the embedded atom method (EAM) is used. The critical shear stresses for a single disocation to pass across GB surface are obtained at values of sigma(c)=23MPa similar to 68 MPa and 137 MPa similar to 274 MPa for Sigma=165 small angle tilt GB at 300 K and 20 K, respectively. The first result agrees with the experimental yield stress sigma(y)(=42 MPa) quite well. It suggests that there might be one of the reasons of initial plastic yielding caused by single dislocation gliding across GB. In addition, there might be possibility to obtain yield strength from microscopic analysis. Moreover, the experimental value of sigma(y) at low temperature is generally higher than that at room temperature. So, these results are in conformity qualitatively with experimental fact. On the other hand, the Sigma=25 GB is too strong an obstacle to the dislocation. In this case, a dislocation is able to pass across GB under relatively low stress only when it is driven by other dislocations. This is taken to mean that dislocation pile-up must be built up in front of this kind of GB, if this GB may take effect on the process of plastic deformation.
关键词	Molecular Dynamics Grain Boundary Dislocation Copper Yielding Grain-boundaries Metals
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:A1996TW60400008
关键词[WOS]	GRAIN-BOUNDARIES ; METALS
WOS研究方向	Engineering ; Mechanics
WOS类目	Engineering, Mechanical ; Mechanics
引用统计	被引频次：1[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/311007/39156
专题	力学所知识产出(1956-2008)
通讯作者	Chen, ZY (reprint author), ACAD SINICA,INST MECH,BEIJING 100080,PEOPLES R CHINA.
推荐引用方式 GB/T 7714	Chen ZY,Chen, ZY . Molecular dynamics studies on the dislocation gliding near a tilt boundary[J]. Acta Mechanica Sinica,1996,12,1,:73-84.
APA	陈致英,&Chen, ZY .(1996).Molecular dynamics studies on the dislocation gliding near a tilt boundary.Acta Mechanica Sinica,12(1),73-84.
MLA	陈致英,et al."Molecular dynamics studies on the dislocation gliding near a tilt boundary".Acta Mechanica Sinica 12.1(1996):73-84.

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