Effect of Solution Treatment. on Globularization Evolution of alpha Lamellae of High Strength and High Toughness Titanium Alloy

The alloy of Ti-Al-Sn-Zr-Mo-Cr-V-Fe system was used as the research object. Different solution heat treatments were designed to establish the foundation of the best match optimization between the toughness and hardness of the alloy. The influence of holding time of solution treatment on the globularization of alpha layer was studied by metallographic microstructure and lamellae size analysis. Results show that with the increase of the holding time, the globularization rate increases to the highest and then it becomes stable. The phenomenon was also analyzed by boundary splitting and termination migration. It is demonstrated that the study provides experimental basis for the design of thermal processing parameters and the matching between strength and toughness in alpha/beta two-phase zone.