Phase stability of TiAl-X (X=V, Nb, Ta, Cr, Mo, W, and Mn) alloys

doi:10.1016/j.jallcom.2019.153291

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	Phase stability of TiAl-X (X=V, Nb, Ta, Cr, Mo, W, and Mn) alloys
	Ye, Li-Hua; Wang, Hao; Zhou, Gang; Hu, Qing-Miao; Yang, Rui
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2020-04-05
卷号	819 页码:8
关键词	Titanium aluminide Phase decomposition Phase stability First-principles calculations Composition design Transition metal elements
ISSN号	0925-8388
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
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136645]
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.