Influence of hot rolling deformation on microstructure and properties of Ti-10V-2Fe-3Al alloy

Influences of deformation temperature, deformation amount and two-step aging on microstructure and mechanical properties of Ti-10V-2Fe-3Al alloy were analyzed. The results show that with increasing deformation temperature, the strength of the specimen increases gradually due to the increasing secondary alpha phase platelets, which precipitate from the retained β phase during the aging. When the deformation temperature (845°C) is above the beta transus temperature, the β grains grow rapidly because the pinning effect of the primary alpha phase to β grain becomes obviously weakened, which makes the tensile ductility decreasing significantly above T_β region. The volume fraction of secondary alpha phase depends on the deformation temperature, so no significant influence of deformation amount on mechanical properties of Ti-10V-2Fe-3Al alloy is observed. The two-step aging is composed of aging at 300°C and aging at 500°C, it is observed that ω phase precipitation occurs when aging at 300°C and the α phase precipitation is promoted by the nucleation of α on the ω particles during the followed high temperature aging at 500°C, resulting in the uniform and finer distribution of α precipitates, and the tensile strength increasing obviously.