Dynamic Mechanical Properties and Adiabatic Shear of Ti6321 Titanium Alloy Under Creep Preloading
Creep loading has a certain effect on the service performance of structural components.In this research,the creep preloading on Ti6321 titanium alloy with equiaxed,bimodal and Widmanstatten microstructures was carried out.Dynamic compression tests of the materials after creep were conducted at a strain rate of 3000 s-1.The dynamic behavior of Ti6321 titanium alloy after different creep stress loadings was studied.The results show that the yield strength decreases and the compressive strength increases after creep preloading.With the increase in creep stress,the impact absorption energy of titanium alloy of three microstructures after dynamic compression increases and the adiabatic shear sensitivity decreases.Titanium alloys without creep have phase transition bands after dynamic compression,and the titanium alloys with equiaxed microstructure and bimodal microstructure after dynamic compression followed by creep preloading do not fail but only produce deformation band.Titanium alloy with Widmanstatten microstructure fails due to phase transition bands.The adiabatic shear of titanium alloys with equiaxed and bimodal microstructures is delayed by creep.