Research Progress on High-Temperature Oxidation Protection of TiAl Alloys

Abstract:

The TiAl alloy is considered a promising material for aerospace and other high temperature applications due to its low density, high strength and excellent creep resistance. However, its application is currently limited by its poor oxidation resistance above 750 ℃. In this paper, the classification, development, and high temperature oxidation behavior of TiAl alloys were reviewed. The formation mechanism and structural evolution of oxide films were discussed. The research progress of the preparation processing, bulk alloying, reinforcing phase and surface modification technologies aimed at improving the high temperature oxidation resistance of TiAl alloys since the 21st century were summarized. Furthermore, the application of theoretical calculation in oxidation process was discussed and the development trend of this field was prospected.

Key words:TiAl alloy;high temperature oxidation;alloying;surface modification;theoretical calculation