The role of oxygen content and cooling rate on transformations in TiAl-based alloys

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	The role of oxygen content and cooling rate on transformations in TiAl-based alloys
	A. Huang; M. H. Loretto; D. Hu; K. Liu; X. H. Wu
	2006
发表期刊	Intermetallics
ISSN	0966-9795
卷号	14 期号:7 页码:838-847
摘要	Samples of Ti46A18Nb (at.%) with oxygen contents of 500 or 1500 wt ppm have been cooled at various rates in order to further our understanding of the factors which influence the phase transformations in these alloys. In agreement with earlier work it has been found that increase of oxygen can suppress the massive transformation. At high cooling rates retained alpha (ordered alpha 2) is found, with a very limited amount of massively transformed grain boundary gamma in both alloys. At lower cooling rates the response to quenching is very different in the different oxygen content samples. Retained alpha, heavily faulted alpha or fine lamellae are formed at grain boundaries as the cooling rate is decreased in the higher oxygen samples with limited massive gamma in grain centres, whereas in the 500 ppm sample the microstructure is virtually fully massive at these cooling rates. The amount of massive gamma which appears to be nucleated away from the original alpha boundaries is also strongly influenced by cooling rate and oxygen content. These results are interpreted in terms of the overall oxygen level, the extent of the segregation of oxygen during quenching, the nucleation of massive gamma in grain centres and the instability of retained alpha during slow cooling and at saltbath temperatures. (c) 2006 Published by Elsevier Ltd.
部门归属	univ birmingham, irc mat, birmingham b15 2tt, w midlands, england. chinese acad sci, inst met res, shenyang, peoples r china.;wu, xh (reprint author), univ birmingham, irc mat, birmingham b15 2tt, w midlands, england;x.wu.1@bham.ac.uk
关键词	Titanium Alummides Based On Tial Phase Transformation Heat Treatment Microstructure Massive Transformation Al-alloy Kinetics
URL	查看原文
WOS记录号	WOS:000236921300018
引用统计	被引频次：28[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/321006/34251
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	A. Huang,M. H. Loretto,D. Hu,et al. The role of oxygen content and cooling rate on transformations in TiAl-based alloys[J]. Intermetallics,2006,14(7):838-847.
APA	A. Huang,M. H. Loretto,D. Hu,K. Liu,&X. H. Wu.(2006).The role of oxygen content and cooling rate on transformations in TiAl-based alloys.Intermetallics,14(7),838-847.
MLA	A. Huang,et al."The role of oxygen content and cooling rate on transformations in TiAl-based alloys".Intermetallics 14.7(2006):838-847.