The site occupancies of alloying elements in TiAl and Ti3Al alloys

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	The site occupancies of alloying elements in TiAl and Ti3Al alloys
	Y. L. Hao; D. S. Xu; Y. Y. Cui; R. Yang; D. Li
	1999
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	47 期号:4 页码:1129-1139
摘要	The site occupancies of V, Cr, Mn, Fe, Ni, Zr, Nb, Mo, Ta, Ga and Sn (1-5 at.%) in TiAl alloys with different compositions, and in Ti3Al with the compositions of Ti-26 at.%Al-(1-2 at.%)X, were measured by the atom location channelling enhanced microanalysis (ALCHEMI) method. For TiAl alloys, the results show that Zr, Nb and Ta atoms invariably occupy Ti sites, while Fe, Ni, Ga and Sn atoms occupy Al sites, the alloy composition having no significant influence on their site preference. By contrast, the site preference of V, Cr, and Mn changes considerably with alloy composition (the Ti/Al ratio in particular), the probability of these elements substituting for Ti decreasing in the above order. For quaternary Ti-Al-V-Cr alloys, the site occupancies of V and Cr do not show much mutual influence. In general, with increasing atomic number, elements in the same period show increasing tendency to substitute for Al, as is the tendency to substitute for Ti for elements in the same group of the periodic table. For Ti3Al alloys, Ga and Sn atoms occupy Al sites, while V, Cr, Mn, Zr, Nb, Mo and Ta atoms occupy Ti sites, the site preference of V, Cr, Mn and Mo in TiAl alloys being different from that in Ti3Al. The experimental results are interpreted in terms of a Bragg-Williams-type model and bond-order data obtained from electronic structure calculation. Qualitative agreement between the model and measurements is reached. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
部门归属	chinese acad sci, inst met res, shenyang 110015, peoples r china.;yang, r (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110015, peoples r china
关键词	Electron-channeling Analysis Substitution Behavior Ternary Additions Base Alloys Alchemi Atoms Diffraction Location Compound Zone
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WOS记录号	WOS:000079337600005
引用统计	被引频次：163[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37364
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. L. Hao,D. S. Xu,Y. Y. Cui,et al. The site occupancies of alloying elements in TiAl and Ti3Al alloys[J]. Acta Materialia,1999,47(4):1129-1139.
APA	Y. L. Hao,D. S. Xu,Y. Y. Cui,R. Yang,&D. Li.(1999).The site occupancies of alloying elements in TiAl and Ti3Al alloys.Acta Materialia,47(4),1129-1139.
MLA	Y. L. Hao,et al."The site occupancies of alloying elements in TiAl and Ti3Al alloys".Acta Materialia 47.4(1999):1129-1139.