摘要
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.
High Nb containing TiAl alloy was fabricated in argon atmosphere by reactive hot pressing process. Reaction mechanism was investigated by means ofmicrostructural 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.
出处
《中国有色金属学会会刊：英文版》
CSCD
2006年第4期853-857,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(704008) supported by the Key Grant Project of Chinese Ministry of Education
Project(NCET-04-01017) supported by the Program for New Century Excellent Talents in University, China
关键词
TIAL合金
铌
粉末冶金
反应机理
热力学
TiAl based alloy
high Nb containing TiA1 alloy
powder metallurgy
reaction mechanism
thermodynamics
