TEM observations of mechanical twins in a hot-deformed Ti-45Al-10Nb alloy
文献类型：期刊论文
| 作者 | J. G. Wang ; L. C. Zhang ; G. L. Chen ; H. Q. Ye |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 1998 |
| 卷号 | 252期号:2页码:222-231 |
| 关键词 | intermetallic compounds TiAl alloys mechanical twinning TEM resolution electron-microscopy interfacial boundaries deformation twins intersections temperatures propagation aluminides ti |
| ISSN号 | 0921-5093 |
| 中文摘要 | Two types of {111} [11 (2) over bar] twins in a hot-deformed Ti-45Al-10Nb alloy were investigated by high resolution transmission electron microscopy (HREM). Type P ((111) [11 (2) over bar]) twins can be formed either through dislocation mechanisms or at grain boundary. The former can be further described by two mechanisms. One is the pole mechanism and the other is the dissociation of a perfect dislocation mechanism. For the formation of twins at the grain boundary, twins can be nucleated by bowing out of twinning dislocations at the grain boundary and propagated by the sequential emission of twinning dislocations on every adjacent twinning plane. 1/3[111] Frank partial dislocations can be observed at steps on the incoherent twin boundary of some twins. A mechanism has been proposed to illustrate the propagation of the twins with or without 1/3[111] Frank partials at the steps on the incoherent twin boundary. Type Q (((1) over bar 11)[(1) over bar 1 (2) over bar]) twins usually formed at the lamellar interfaces. The steps on these lamellar interfaces are the common sites for the nucleation of type Q twins. Deformation twinning in lamellar TiAl alloys was suggested as a stress relaxation process for the pile-up of interfacial dislocations. Possible dislocation mechanisms for the generation of twinning dislocations on the lamellar interface are discussed. (C) 1998 Elsevier Science S.A. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37800]  |
| 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 | J. G. Wang,L. C. Zhang,G. L. Chen,et al. TEM observations of mechanical twins in a hot-deformed Ti-45Al-10Nb alloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1998,252(2):222-231. |
| APA | J. G. Wang,L. C. Zhang,G. L. Chen,&H. Q. Ye.(1998).TEM observations of mechanical twins in a hot-deformed Ti-45Al-10Nb alloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,252(2),222-231. |
| MLA | J. G. Wang,et al."TEM observations of mechanical twins in a hot-deformed Ti-45Al-10Nb alloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 252.2(1998):222-231. |
入库方式： OAI收割
来源：金属研究所
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