20Zr-70Ti-6Al-4V合金静动态力学性能研究

This study aims to evaluate the static and dynamic mechanical properties of 20Zr-70Ti-6Al-4V alloy. The XRD, DSC, OM and SEM were used to test and analyze the phase transition and microstructural evolution of the 20Zr alloys subjected to different heat treatments. Dynamic compression tests were conducted by the SHPB (split Hopkinson pressure bar) to study the dynamic mechanical properties. The results show that all 20Zr alloys are composed of α and β phase and they present typical basketweave microstructures. Under static conditions, the tensile strength is up to 1301 MPa, the plastic strain is up to 14.9%, and the compressive strength is up to 1386 MPa. The static failure is caused by ductile fracture. Under dynamic compression condition, the dynamic compressive strength increases as the strain rate increases from 1000 s^-1 to 3000 s^-1, which reflects the strain hardening effect. In addition, the dynamic compressive strength and the plastic strain of 20Zr alloys undergoing the solid solution and aging treatment exceed those of the annealed alloys. Besides, the dynamic failure of alloys results from the adiabatic shear bands.