Compressive Mechanical Properties and Shock-Induced Reaction Behavior of a Ti-29Nb-13Ta-4.6Zr Alloy

The compressive mechanical properties of a Ti-29Nb-13Ta-4.6Zr alloy were investigated at room temperature under various strain rates. The parameters of a modified Johnson-Cook constitutive equation were determined to describe the strain softening behavior under dynamic conditions. The testing results under compression show yield strength evidently increases with the increase of the strain rate. Moreover, it was found that the strain-rate effect of the yield strength upon dynamic deformation is more significant than that upon quasi-static deformation. In order to characterize the impact-initiated reaction behavior of Ti-29Nb-13Ta-4.6Zr alloy, the quasi-sealed test chamber was used to measure the pressure caused by energy released of fragments. It was obviously shown that the exothermic chemical reaction was more intense with the increase of impact velocity.