Abstract: Effects of different solution treatment and aging temperature on microstructure and mechanical properties of IMI834 alloy were studied. The results show that there is no significant difference between the microstructure of IMI834 alloy plate heat treated at low temperature and that of as-rolled, and the room temperature strength is also basically unchanged. The bimodal structure of the alloy is obtained after heat treatment in α+β two-phase region, and with the increase of solid solution treatment temperature, the content of primary α phase decreases, the room temperature strength increases slightly, and the change law of plasticity is opposite to that of the strength. The decrease of primary α phase content has no obvious effect on the room temperature strength of the alloy plate. With the increase of aging temperature, the strength of the alloy plate at room temperature decreases and the plasticity decreases to some extent. The high temperature mechanical properties of the plate at 600 ℃ are similar to those at room temperature, but the reduction of area is better than that at room temperature. The optimum heat treatment process obtained in this experiment is 1035 ℃×1 h (air cooling)+ (700-750) ℃×4 h (air cooling).

Key words: IMI834 titanium alloy, microstructure, mechanical properties