Phase stability of TiAl-X (X=V, Nb, Ta, Cr, Mo, W, and Mn) alloys
文献类型：期刊论文
| 作者 | Ye, Li-Hua; Wang, Hao; Zhou, Gang; Hu, Qing-Miao; Yang, Rui |
| 刊名 | JOURNAL OF ALLOYS AND COMPOUNDS
 |
| 出版日期 | 2020-04-05 |
| 卷号 | 819页码:8 |
| ISSN号 | 0925-8388 |
| 关键词 | Titanium aluminide Phase decomposition Phase stability First-principles calculations Composition design Transition metal elements |
| DOI | 10.1016/j.jallcom.2019.153291 |
| 通讯作者 | Hu, Qing-Miao(qmhu@imr.ac.cn) |
| 英文摘要 | Introducing high symmetric cubic disordered beta or ordered beta(0) phases by alloying beta-stabilizers improves the strength and high-temperature deformability of intermetallic gamma-TiAl. However, the beta phase is prone to decomposition of lower symmetric hexagonal phases such as omega(0) and omega '', which are extremely brittle and harmful to the ductility of the alloy. Therefore, understanding the effect of the beta-stabilizers on the phase stability of TiAl is crucial for the rational design of TiAl based alloys. In the present work, the equilibrium lattice structures, bulk moduli, and heats of formation of beta, beta(0), omega '', and omega(0) of TiAl with some typical beta stabilizers V, Nb, Ta, Cr, Mo, W, and Mn were calculated by using a first-principles method, with which the relative phase stability were discussed. We showed that the phase stability sequence is beta < beta(0) < omega(0) < omega '' for Ti4Al3Nb and Ti4Al3Ta, beta < beta(0) < omega(0) < omega '' for Ti4Al3V, Ti4Al3Mo and Ti4Al3W, and beta < beta(0) < omega(0) < omega '' for Ti4Al3Cr and Ti4Al3Mn. The beta-stabilizing effect of the alloying element X increases from Nb/Ta to V/Mo/W to Cr/Mn. The relative stability of the various phases is roughly in accordance with the trends of the unit volume and bulk modulus against the phases with a few exceptions. The phase diagrams of the alloys associated with these phases were estimated by comparing the free energies against the temperature of various phases, evaluated with the calculated unit volumes and bulk moduli. (C) 2019 Elsevier B.V. All rights reserved. |
| 资助项目 | National Key Research and Development Program[2016YFB0701301] ; Ministry of Industry and Information Technology of China |
| WOS研究方向 | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE SA |
| WOS记录号 | WOS:000507378300070 |
| 资助机构 | National Key Research and Development Program ; Ministry of Industry and Information Technology of China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/136647]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Hu, Qing-Miao |
| 作者单位 | Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ye, Li-Hua,Wang, Hao,Zhou, Gang,et al. Phase stability of TiAl-X (X=V, Nb, Ta, Cr, Mo, W, and Mn) alloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,819:8. |
| APA | Ye, Li-Hua,Wang, Hao,Zhou, Gang,Hu, Qing-Miao,&Yang, Rui.(2020).Phase stability of TiAl-X (X=V, Nb, Ta, Cr, Mo, W, and Mn) alloys.JOURNAL OF ALLOYS AND COMPOUNDS,819,8. |
| MLA | Ye, Li-Hua,et al."Phase stability of TiAl-X (X=V, Nb, Ta, Cr, Mo, W, and Mn) alloys".JOURNAL OF ALLOYS AND COMPOUNDS 819(2020):8. |
入库方式： OAI收割
来源：金属研究所
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