Dislocation evolution in epitaxial multilayers and graded composition buffers

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	Dislocation evolution in epitaxial multilayers and graded composition buffers
	Wang ZQ(王自强); Zhang YW(张永伟); Chua SJ
刊名	Acta Materialia
	2001
卷号	49 期号:9 页码:1599-1605
ISSN号	1359-6454
通讯作者	Wang, TC (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
中文摘要	This paper presents models to describe the dislocation dynamics of strain relaxation in an epitaxial uniform layer, epitaxial multilayers and graded composition buffers. A set of new evolution equations for nucleation rate and annihilation rate of threading dislocations is developed. The dislocation interactions are incorporated into the kinetics process by introducing a resistance term, which depends only on plastic strain. Both threading dislocation nucleation and threading dislocation annihilation are characterized. The new evolution equations combined with other evolution equations for the plastic strain rate, the mean velocity and the dislocation density rate of the threading dislocations are tested on GexSi1-x/Si(100) heterostructures, including epitaxial multilayers and graded composition buffers. It is shown that the evolution equations successfully predict a wide range of experimental results of strain relaxation and threading dislocation evolution in the materials system. Meanwhile, the simulation results clearly signify that the threading dislocation annihilation plays a vital role in the reduction of threading dislocation density.
学科主题	力学
类目[WOS]	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
研究领域[WOS]	Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]	STRAIN RELAXATION ; HETEROSTRUCTURES ; KINETICS ; LAYERS
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000168904700011
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/17592]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Wang ZQ,Zhang YW,Chua SJ. Dislocation evolution in epitaxial multilayers and graded composition buffers[J]. Acta Materialia,2001,49(9):1599-1605.
APA	王自强,张永伟,&Chua SJ.(2001).Dislocation evolution in epitaxial multilayers and graded composition buffers.Acta Materialia,49(9),1599-1605.
MLA	王自强,et al."Dislocation evolution in epitaxial multilayers and graded composition buffers".Acta Materialia 49.9(2001):1599-1605.