Dislocation slip or deformation twinning: confining pressure makes a difference

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	Dislocation slip or deformation twinning: confining pressure makes a difference
	D. S. Xu; J. P. Chang; J. Li; R. Yang; D. Li; S. Yip
	2004
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	387 页码:840-844
摘要	While b.c.c. metals deform plastically by dislocation motion or deformation twinning, the atomistic mechanisms governing the choice of deformation modes are not well established. Molecular dynamics simulations using the Finnis-Sinclair potential were carried out to explore the pressure dependence of the deformation response of b.c.c. molybdenum. The crystal was sheared in (112)[(1) over bar(1) over bar1] under various confining pressures. The homogeneous nucleation stress of deformation twinning was found to increase with increasing confining pressure. Under sufficient pressure (011)[(1) over bar(1) over bar1] dislocations were nucleated instead of twins. Details of the dislocation and twin nucleations were analyzed with the help of the multi-layer generalized stacking fault energies. A two-fault (n = 2) metastable twin state was found, in contrast to previous results using pair potentials. (C) 2004 Published by Elsevier B.V.
部门归属	chinese acad sci, inst met res, titanium alloy lab, shenyang 110016, peoples r china. mit, dept nucl engn, cambridge, ma 02139 usa. ohio state univ, dept mat sci & engn, columbus, oh 43210 usa.;xu, ds (reprint author), chinese acad sci, inst met res, titanium alloy lab, 72 wenhua rd, shenyang 110016, peoples r china;dsxu@imr.ac.cn
关键词	Twin Nucleation Molecular Dynamics B.c.c. Metal Mo Pressure Multilayer Stacking-faults Bcc Metals Transition-metals Molybdenum Lattices Crystals Fcc
URL	查看原文
WOS记录号	WOS:000226042400173
引用统计	被引频次：40[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/321006/35659
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. S. Xu,J. P. Chang,J. Li,et al. Dislocation slip or deformation twinning: confining pressure makes a difference[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2004,387:840-844.
APA	D. S. Xu,J. P. Chang,J. Li,R. Yang,D. Li,&S. Yip.(2004).Dislocation slip or deformation twinning: confining pressure makes a difference.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,387,840-844.
MLA	D. S. Xu,et al."Dislocation slip or deformation twinning: confining pressure makes a difference".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 387(2004):840-844.