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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 4    August 2006

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Reaction mechanism in high Nb containing TiAl alloy by elemental powder metallurgy
WANG Yan-hang(王衍行)1, LIN Jun-pin(林均品)1, HE Yue-hui(贺跃辉)2,
WANG Yan-li(王艳丽)1, LIN Zhi(林 志)1, CHEN Guo-liang(陈国良)1

1. State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University,
Changsha 410083, China

Abstract: High Nb containing TiAl alloy was fabricated in argon atmosphere by reactive hot pressing process. Reaction mechanism was investigated by means of microstructural analyses and thermodynamic calculations. The results show that it is feasible to prepare high Nb containing TiAl alloy with fine lamellar colonies by reactive hot pressing process. The reaction between Ti and Al powders is dominant in Ti-Al-Nb system. Nb powders dissolve into the Ti-Al matrix by diffusion. Pore nests are formed in situ after Nb powders diffusion. The hot pressing atmosphere is optimized by thermodynamic calculations. Vacuum or argon protective atmosphere should be adopted.

 

Key words: TiAl based alloy; high Nb containing TiAl alloy; powder metallurgy; reaction mechanism; thermodynamics

ISSN 1672-7029
CN 43-1423/U

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