Molecular dynamics investigation of deformation twinning in gamma-TiAl sheared along the pseudo-twinning direction

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	Molecular dynamics investigation of deformation twinning in gamma-TiAl sheared along the pseudo-twinning direction
	D. S. Xu; H. Wang; R. Yang; P. Veyssiere
	2008
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	56 期号:5 页码:1065-1074
摘要	In spite of being sheared along the so-called pseudo-twinning [(2) over bar 11] direction, gamma-TiAl undergoes true twinning under zero pressure or hydrostatic tension by means of a specific combination of 1/6[(2) over bar 1/6[(1) over bar 2 (1) over bar] and 1/6[(1) over bar(1) over bar2] shears in two consecutive (111) matrix planes allowing the adjacent twin to thicken over one (111) atomic layer. The corresponding total shear strain of 2 root 2 is four times as large as that generated by conventional deformation twinning or during the Ll(0) to Ll(1) transformation by 1/6[11 (2) over bar] or 1/6'[(2) over bar 11] shears, respectively. This shear is substantially more effective in accommodating stress concentration and high strain rate than conventional deformation twinning. The conditions under which twinning by 2/3 [(2) over bar 11] dislocations operates are interpreted based on a modified gamma-surface and discussed in terms of zonal partial dislocations. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[xu, dongsheng; wang, hao; yang, rui] chinese acad sci, inst met res, shenyang 110016, peoples r china. [veyssiere, patrick] cnrs onera, lem, f-92322 chatillon, france.;xu, ds (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;dsxu@imr.ac.cn
关键词	Molecular Dynamics Simulations Plastic Deformation Twinning Dislocation Intermetallic Compounds Single-crystals Temperature-dependence Room-temperature Faulted Dipoles Stacking Faults Yield Stress Slip Al Alloys Creep
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WOS记录号	WOS:000254183000016
引用统计	被引频次：47[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/321006/33245
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. S. Xu,H. Wang,R. Yang,et al. Molecular dynamics investigation of deformation twinning in gamma-TiAl sheared along the pseudo-twinning direction[J]. Acta Materialia,2008,56(5):1065-1074.
APA	D. S. Xu,H. Wang,R. Yang,&P. Veyssiere.(2008).Molecular dynamics investigation of deformation twinning in gamma-TiAl sheared along the pseudo-twinning direction.Acta Materialia,56(5),1065-1074.
MLA	D. S. Xu,et al."Molecular dynamics investigation of deformation twinning in gamma-TiAl sheared along the pseudo-twinning direction".Acta Materialia 56.5(2008):1065-1074.