Molecular dynamics investigation of deformation twinning in gamma-TiAl sheared along the pseudo-twinning direction
文献类型：期刊论文
| 作者 | D. S. Xu ; H. Wang ; R. Yang ; P. Veyssiere |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2008 |
| 卷号 | 56期号:5页码:1065-1074 |
| 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 |
| ISSN号 | 1359-6454 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/33245]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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