Effect of temperature and strain rate on the shear properties of Ti–6Al–4V alloy

AbstractThis study uses the torsional split-Hopkinson bar to investigate the dynamic shear deformation and fracture behaviour of Ti–6Al–4V alloy under strain rates of 1800, 2300, and 2800 s−1 at temperatures ranging from −100 to 300 °C. It is found that both the strain rate and the temperature have a strong influence on the dynamic shear properties and fracture characteristics of the alloy. An increased strain rate and a reduced temperature cause the strain rate sensitivity to increase and the activation volume to decrease. However, the activation energy increases with decreasing shear stress and is found to attain a maximum value of 15 kJ/ mol under the current test conditions. The failure of the tested alloy is dominated by the formation of an adiabatic shear band. The characteristics of the adiabatic shear band and the fracture surface depend significantly on both the strain rate and the temperature.