Stress-induced phase transformations in a hot-deformed two-phase (alpha(2)+gamma) TiAl alloy

IMR OpenIR

	Stress-induced phase transformations in a hot-deformed two-phase (alpha(2)+gamma) TiAl alloy
	J. G. Wang; L. C. Zhang; G. L. Chen; H. Q. Ye
	1998
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	33 期号:10 页码:2563-2571
摘要	Stress-induced gamma --> alpha(2), alpha(2) --> gamma and gamma --> 9R phase transformations in a hot-deformed Ti-45 at % Al-10 at% Nb alloy have been investigated using high-resolution transmission electron microscopy. The gamma --> alpha(2) phase transformation is an interface-related process. The interfacial superdislocations emitted from the misoriented semicoherent alpha(2)-gamma interface react with each other or with the moving dislocations in the gamma phase, resulting in the formation of the at phase. The nucleation of the alpha(2) --> gamma phase transformation takes place either at the alpha(2)-gamma interfaces or at the stacking faults on the basal plane of alpha(2) phase, and the growth of gamma plate is accomplished by the moving of a/6[1 0 (1) over bar 0] Shockley partials on alternate basal plane (0 0 0 1 )(alpha 2). The 9R structure was usually found to form at incoherent twin or pseudotwin boundaries. During deformation the interfacial Shockley partial dislocations of these incoherent twin and pseudotwin boundaries may glide on (1 1 1), planes into the matrix, resulting in the formation of 9R structure. The interfaces (including alpha(2)-gamma and gamma-gamma interfaces) as well as the crystallographic orientation relationship between the as-received or stress-induced alpha(2), gamma and 9R phase have been analysed. The mechanisms for the stress-induced gamma --> alpha(2), alpha(2) --> gamma and gamma --> 9R phase transformations were also discussed. (C) 1998 Chapman & Hall.
部门归属	univ sci & technol beijing, state key lab adv met & mat, beijing 100083, peoples r china. acad sinica, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;wang, jg (reprint author), univ calif lawrence livermore natl lab, pob 808,l-370, livermore, ca 94551 usa
关键词	Transmission Electron-microscopy Gamma-titanium Aluminides Interfacial Boundaries Intermetallic Alloys Ti-45al-10nb Alloy Base Alloys Deformation
URL	查看原文
WOS记录号	WOS:000077590400009
引用统计	被引频次：6[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/321006/37801
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. G. Wang,L. C. Zhang,G. L. Chen,et al. Stress-induced phase transformations in a hot-deformed two-phase (alpha(2)+gamma) TiAl alloy[J]. Journal of Materials Science,1998,33(10):2563-2571.
APA	J. G. Wang,L. C. Zhang,G. L. Chen,&H. Q. Ye.(1998).Stress-induced phase transformations in a hot-deformed two-phase (alpha(2)+gamma) TiAl alloy.Journal of Materials Science,33(10),2563-2571.
MLA	J. G. Wang,et al."Stress-induced phase transformations in a hot-deformed two-phase (alpha(2)+gamma) TiAl alloy".Journal of Materials Science 33.10(1998):2563-2571.