The influence of alloying on the alpha(2)/(alpha(2)+gamma)/gamma phase boundaries in TiAl based systems

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	The influence of alloying on the alpha(2)/(alpha(2)+gamma)/gamma phase boundaries in TiAl based systems
	Y. L. Hao; R. Yang; Y. Y. Cui; D. Li
	2000
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	48 期号:6 页码:1313-1324
摘要	By employing both experimental and theoretical approaches, a comparative study of the alpha(2)/(alpha(2) + gamma)/gamma phase boundaries in some Ti-Al-X (X = Nb, Ta, V, Cr, Mn, Fe or Ga) systems has been carried our. The phase constitution of Ti-(33-51 at.%)Al-(w1-3 at.%)X alloys with a composition step of 1 at.% Al was determined experimentally by using the X-ray diffraction method on bulk samples equilibrated at 1173 K. The alpha(2)/(alpha(2) + gamma) and (alpha(2) + gamma)/gamma phase boundaries were calculated using a model that describes the phase boundaries in terms of sublattice site occupancies of alloying species in the two ordered phases. The differences between the predicted and experimentally determined phase boundaries were found to be less than about 1 at.% in most cases. The predicted volume fractions of constituent phases were also compared with experimental measurements by a combination of metallography and transmission electron microscopy. Agreement between the two is good for 14 ternary and two quaternary alloys containing 46 at.% Al. The present work suggests that, in the order of increasing strength of stabilization at 1173 K, V, Nb and Ta stabilize the alpha(2) phase, whereas Cr, Mn, Fe and Ga stabilize the gamma phase. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. AN rights reserved.
部门归属	acad sinica, inst met res, shenyang 110015, peoples r china.;yang, r (reprint author), acad sinica, inst met res, 72 wenhua rd, shenyang 110015, peoples r china
关键词	Energy Dispersive X-ray Analysis (Eds) X-ray Diffraction (Xrd) Compounds (Intermetallic) Phase Transformations (Phase Diagrams) Theory & Modeling (Defects) Gamma-titanium Aluminides 1400-degrees-c Isothermal Section Al-nb System Dislocation Configurations Temperatures Behavior
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WOS记录号	WOS:000086265100009
引用统计	被引频次：43[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/321006/37042
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. L. Hao,R. Yang,Y. Y. Cui,et al. The influence of alloying on the alpha(2)/(alpha(2)+gamma)/gamma phase boundaries in TiAl based systems[J]. Acta Materialia,2000,48(6):1313-1324.
APA	Y. L. Hao,R. Yang,Y. Y. Cui,&D. Li.(2000).The influence of alloying on the alpha(2)/(alpha(2)+gamma)/gamma phase boundaries in TiAl based systems.Acta Materialia,48(6),1313-1324.
MLA	Y. L. Hao,et al."The influence of alloying on the alpha(2)/(alpha(2)+gamma)/gamma phase boundaries in TiAl based systems".Acta Materialia 48.6(2000):1313-1324.