TEM study on lamellar microstructure and alpha(2)/gamma interfacial structure in a hot-deformed two-phase gamma-TiAl-based alloy
文献类型：期刊论文
| 作者 | L. C. Zhang ; G. L. Chen ; J. G. Wang ; H. Q. Ye |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 1998 |
| 卷号 | 247期号:1-2页码:40915 |
| 关键词 | TiAl alloy deformation lamellae bending/kinking alpha(2)/gamma interface HREM microstructure transmission electron-microscopy titanium aluminide dislocation-structure deformation boundaries |
| ISSN号 | 0921-5093 |
| 中文摘要 | The hot deformation behavior of the lamellar microstructure in a Ti-45Al-8Nb-2.5Mn-0.05B alloy has been studied by transmission electron microscopy (TEM). Numerous subgrain boundaries and two types of deformation twins were frequently observed in the hot-deformation-induced lamellae. The occurrence of nonequilibrium semi-coherent alpha(2)/gamma interfaces is an important microstructural feature of hot-deformed lamellar microstructure in a similar Ti-45Al-10Nb-2.5Mn-0.05B alloy. The distinctiveness of these alpha(2)/gamma interfaces is the misorientation from the conventional alpha(2)/gamma orientation relationship{111}(y) parallel to {0001}(alpha 2), <1 (1) over bar 0<(gamma) parallel to <11 (2) over bar 0>(alpha 2), as well as the asymmetry in the sense of interfacial boundary planes deviating from the equilibrium atomic planes (111)(gamma) or (0001)(alpha 2). Numerous interfacial ledges containing 1/3[111] Frank partial dislocations exist in this nonequilibrium semi-coherent alpha(2)/gamma interface. The analyses point out that, in the hot-deformation-induced bent lamellae, the 1/3[111] Frank partial dislocations in the ledges of alpha(2)/gamma interfaces can be formed by reactions between the matrix and interfacial dislocations. This type of semi-coherent alpha(2)/gamma interface is formed in order to accommodate the relative rotation of alpha(2) and gamma plates resulting from their heterogeneous deformation behavior. In the sharply bent lamellae, there even occur largely misoriented, non-coherent alpha(2)/gamma interfaces with the {111}(gamma) plane no longer being parallel to the {0001}(alpha 2) plane, resulting from the lamellae bending/kinking during heavy deformation. At these nonequilibrium, non-coherent alpha(2)/gamma interfaces with high interfacial strain energy, the T(Q) deformation twins, being inclined to the lamellar interface, are observed to be preferentially formed. The process is favored by the localized stress field of the interfacial misfit dislocations. (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/321006/37872]  |
| 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 | L. C. Zhang,G. L. Chen,J. G. Wang,et al. TEM study on lamellar microstructure and alpha(2)/gamma interfacial structure in a hot-deformed two-phase gamma-TiAl-based alloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1998,247(1-2):40915. |
| APA | L. C. Zhang,G. L. Chen,J. G. Wang,&H. Q. Ye.(1998).TEM study on lamellar microstructure and alpha(2)/gamma interfacial structure in a hot-deformed two-phase gamma-TiAl-based alloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,247(1-2),40915. |
| MLA | L. C. Zhang,et al."TEM study on lamellar microstructure and alpha(2)/gamma interfacial structure in a hot-deformed two-phase gamma-TiAl-based alloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 247.1-2(1998):40915. |
入库方式： OAI收割
来源：金属研究所
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