Ti6321钛合金再加载力学行为研究

The quasi-static and dynamic reload compression tests were conducted to explore the changes in mechanical properties of Ti6321 alloy with bimodal structure after preshock. The optical microscopy (OM) and transmission electron microscopy (TEM) were used to observe and analyze the microstructures. The results demonstrate that the static and dynamic yield strength and average flow stress of Ti6321 alloy after preshock are higher than those of the original sample, but the fracture strain and impact absorption energy significantly reduce, and the preshock sample is more likely to appear an adiabatic shear failure after split Hopkinson pressure bar (SHPB) loading. TEM results show that twins form inside the sample after the preshock of the light gas gun, which causes the Ti6321 titanium alloy to exhibit a shock wave strengthening effect.