Nonequilibrium alpha(2)/gamma interfacial structures in a gamma-TiAl based two phase alloy after hot-working and annealing

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	Nonequilibrium alpha(2)/gamma interfacial structures in a gamma-TiAl based two phase alloy after hot-working and annealing
	L. C. Zhang; G. L. Chen; J. G. Wang; H. Q. Ye
	1997
发表期刊	Intermetallics
ISSN	0966-9795
卷号	5 期号:4 页码:289-295
摘要	A transmission electron microscope investigation has been performed on the thermal instability of the nonequilibrium alpha(2)/gamma interfacial structure in a hot-forged Ti-45Al-10Nb-2.5Mn-0.05B alloy. The distinctiveness of these nonequilibrium alpha(2)/gamma interfaces in the hot-deformed sample is the misorientation from the conventional orientation relationship {111}(gamma)//{0001}(alpha 2), <1(1) over bar0$>(gamma)//<<11(2)over bar 0>>(alpha 2). The structure of this nonequilibrium interface boundary is characterized by numerous interfacial ledges containing 1/3[111] Frank partial dislocations. The analysis points towards the formation of this type of nonequilibrium alpha(2)/gamma interface being caused by the relative rotation of alpha(2) and gamma plates in the lamellar structure. Further TEM studies of microstructural changes during annealing for 4 min/1000 degrees C of the nonequilibrium alpha(2)/gamma lamellar structure generated by hot-forging revealed that many low-angle grain boundaries are formed in the gamma plates of lamellar colonies, resulting in a gamma subgrain microstructure; necking of alpha(2) plates occurs preferentially at alpha(2) subgrain boundaries; subsequently disintegration of the original alpha(2) plates takes place resulting in spheroidized alpha(2) particles which are aligned at the prior alpha(2)/gamma boundaries. (C) 1997 Published by Elsevier Science Ltd.
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.
关键词	Titanium Aluminides Based On Tial Hot Forging Phase Interfaces Transmission Electron-microscopy Titanium Aluminide Deformation Boundaries Lamellae
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38207
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. C. Zhang,G. L. Chen,J. G. Wang,et al. Nonequilibrium alpha(2)/gamma interfacial structures in a gamma-TiAl based two phase alloy after hot-working and annealing[J]. Intermetallics,1997,5(4):289-295.
APA	L. C. Zhang,G. L. Chen,J. G. Wang,&H. Q. Ye.(1997).Nonequilibrium alpha(2)/gamma interfacial structures in a gamma-TiAl based two phase alloy after hot-working and annealing.Intermetallics,5(4),289-295.
MLA	L. C. Zhang,et al."Nonequilibrium alpha(2)/gamma interfacial structures in a gamma-TiAl based two phase alloy after hot-working and annealing".Intermetallics 5.4(1997):289-295.