Effects of microstructure on the adiabatic shearing behaviors of titanium alloy

The effects of microstructure on the adiabatic shearing behaviors in the Ti-1300 alloy were investigated by means of the split Hopkinson pressure bar (SHPB) with hat-shaped specimens. Shear bands were developed in both Ti-1300 alloys with β phase and α + β lamellar microstructures during a forced dynamic shear deformation. The microstructures have a significant influence on the adiabatic shearing behaviors of Ti-1300 alloy. The critical strain for the initiation of shear bands in α + β lamellar microstructure is less than that in β phase microstructure. The α + β lamellar microstructure experiences more extensive microscopic damage than β phase microstructure. Therefore, the α + β lamellar microstructure is more susceptive to adiabatic shear localization deformation than β phase microstructure at the same strain rate.