Dynamic Compression Properties of Ti-6Al-4V Titanium Alloy Extruded Sections
This paper aimed to study the dynamic compression properties of Ti-6Al-4V titanium alloy sections. The Ti-6Al-4V sections were extruded above the β-transus temperature with extruding ratio of 85, and then heat treated by conventional annealing at 750°C, or annealing at 1200°C by two routes. Dynamic compression properties were investigated by Split Hopkinson Pressure Bar system at strain rate of 3000±200 s-1. The results show that the dynamic compression properties of as-extruded specimens are comparable to the specimens after conventional annealing at 750°C. Compared to Widmannstatten microstructure with original beta grains in size of 200 μm ~ 300 μm obtained by conventional annealing, the microstructure obtained by annealing at 1200°C with coarse grains consisted of fine α-lamellae exhibits comparable dynamic strength but the capability of plastic deformation reduced about 20%. For the microstructure obtained by annealing at 1200°C with coarse grains consisted of coarse α-lamellae, the dynamic strength slightly decreased, while the capability of plastic deformation reduced about 60%.