Multiple deformation mechanisms induce high work hardening in Ti-5Al-7.5 V alloy via transformed matrix

In this work, different transformed beta matrix was obtained in Ti-5Al-7.5 V alloy. The alloy with equiaxed alpha p phase and transformed beta matrix containing alpha ' martensite and beta phase exhibits good combination of strength and plasticity, as well as a high work hardening rate. A concurrent operation of stress-induced alpha '' martensitic transformation, deformation twinning and dislocation slips was observed governing the deformation process of this alloy. The alloy with equiaxed alpha p phase and transformed beta matrix containing secondary alpha s plates and retained beta phase shows a high strength and plasticity but low work hardening rate, which is caused by dislocation slips.