Effect of Co addition on the microstructure evolution and superplastic behavior of Ti-4Al-3Mo-1V-0.1B alloy

Abstract. Temperature reduction of superplastic forming titanium alloys is currently a significant issue. The present study focused on the effect modifying Ti-4Al-3Mo-1V-0.1B alloy with 0.5-2 wt% Co additions behavior and microstructure evolution. results demonstrated that alloying promoted formation recrystallized globular before beginning deformation due to acceleration diffusivity by in comparison Co-free alloy. also led dynamic grain growth during but stable flow 0.5-2% at temperatures 700-750 °C. This enhanced strain rate sensitivity coefficient m from 0.35-0.4 0.5-0.65 elongation failure 200-350% 500-1000% compared 2 provided excellent low-temperature superplasticity temperature range 625-775 °C 800-1000% constant 1 × 10-3 s-1.