Lattice weakening by edge dislocation core under tension

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	Lattice weakening by edge dislocation core under tension
	X. Y. Gu; D. S. Xu; H. Wang; R. Yang
	2010
发表期刊	Modelling and Simulation in Materials Science and Engineering
ISSN	0965-0393
卷号	18 期号:6
摘要	Molecular dynamics simulations are carried out to investigate the influence of edge dislocations on the lattice strength in iron single crystals under tension perpendicular to the dislocation slip plane. Simulations are performed at different temperatures and with different densities of edge dislocations on the ((1) over bar 01) [111] slip system. It is found that cracks nucleate at dislocation cores in dislocation-containing systems at lower critical stresses compared with a perfect lattice, indicating a weakening caused by edge dislocations. Lattice thermal vibration plays an important role during the tensile deformation, resulting in a monotonic decrease in the yield strength as the temperature increases. There exists a critical temperature above which the lattice transforms from brittle to ductile, where dislocation nucleation and glide are favored instead of crack nucleation, and the critical temperature for the dislocated system is lower than that for the perfect lattice. The present simulation shows that higher dislocation density results in lower fracture strength, suggesting that the accumulation of dislocations during cyclic deformation may be the cause of lower strength under fatigue.
部门归属	[gu, x. y.; xu, d. s.; wang, h.; yang, r.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [gu, x. y.] chinese acad sci, grad sch, beijing 100039, peoples r china.;xu, ds (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;dsxu@imr.ac.cn
关键词	Triple Junction Fracture Crystals Metals Simulations Transition Dynamics Cleavage Iridium Steels
URL	查看原文
WOS记录号	WOS:000280648900004
引用统计	被引频次：8[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/321006/31122
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Y. Gu,D. S. Xu,H. Wang,et al. Lattice weakening by edge dislocation core under tension[J]. Modelling and Simulation in Materials Science and Engineering,2010,18(6).
APA	X. Y. Gu,D. S. Xu,H. Wang,&R. Yang.(2010).Lattice weakening by edge dislocation core under tension.Modelling and Simulation in Materials Science and Engineering,18(6).
MLA	X. Y. Gu,et al."Lattice weakening by edge dislocation core under tension".Modelling and Simulation in Materials Science and Engineering 18.6(2010).