TiAl金属间化合物粉末冶金技术研究进展

Powder Metallurgical Technology Research Progress of Intermetallic Titanium Aluminide

摘要:

粉末冶金可以避免铸锭冶金过程中出现的宏观偏析、枝晶偏析、化学成分不均匀、组织不一致等缺陷，是制备TiAl 合金的重要方法。本文综述了近年来国内外TiAl 合金粉末冶金的研究进展，介绍了预合金法、元素法和机械合金化法三种粉末制备方法及其各自的烧结方法。同时评述了各烧结方法的优缺点及其制备合金的力学性能，并指出了粉末冶金制备TiAl 合金今后有待改善的几个方面。

Abstract:

Many of the problems associated with ingot metallurgy (IM), such as macrogregation, dendritic segregation, chemical inhomogeneity, and regions of varying microstructure can be solved by powder metallurgy, which is an important method to fabricate TiAl alloy. The research states of TiAl alloy in powder metallurgy at home and abroad were reviewed and the fabricatrion processes of TiAl powder were discussed, including prealloyed method, element powder method, mechanical alloying, and their sintering techniques. Their respective advantages and disadvantages, mechanical properties, and some improvement of TiAl powder metallurgy fabrication in future were finally pointed out.