Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 10    No. 4    August 2000

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Phase transformation of fully lamellar γ-TiAl alloys inα+γfield①
CAO Guo-xin(曹国鑫), LIN Jian-guo(林建国),
ZHANG Yong-gang(张永刚), CHEN Chang-qi(陈昌麒)

Department of Materials Science and Engineering,
Beijing University of Aeronautics and Astronautics, Beijing 100083, P.R.China

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.


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

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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