Phase transformation of fully lamellar γ-TiAl alloys in α+γ field

来源期刊：中国有色金属学报(英文版)2000年第4期

论文作者：曹国鑫 林建国 张永刚 陈昌麒

文章页码：425 - 429

Key words：γ-TiAl alloy; phase transformation; microstructure

Abstract: The isothermal phase transformation mechanisms in Ti-46.5Al-2Cr-1.5Nb-1V alloy were studied. The microstructures of the alloy annealed at 1 260℃for different times (2 h, 4 h, 10 h) were observed by using optical microscopy, scanning electron microscopy and transmission electron microscopy. When the annealing time is up to 10h, the primitive large lamellar grains (more than 600μm) transform to small lamellar domains (about 50μm). The small lamellar domains formed from one primitive grain have four kinds of fixed orientations and each orientation has a fixed angle. The lamellar spacing and composition of the small lamellar domains are different from those of the primitive lamellar grains.