Study on hot deformation behavior of titanium alloy by modified Arrhennius equation

Arrhennius equation was modified to obtain a more accurate description of the hot deformation behavior of Titanium alloy. Based on the results that the constant strain rate and isothermal compression experiment for a new type of titanium alloy was performed on thermal simulation testing machine, hot deformation behavior was studied at temperatures of 700~1 000 ℃and strain rates of 0.01~10 s^-1. Using the least square fitting method, the activation energy in α+β and β phase areas was calculated. The constitutive equation of flow stress was obtained by introducing function of parameter A of the Arrhennius equation and temperature. The analysis of the true stress-true strain curves shows that the flow stress sharply increased firstly, then decreased to a steady state. The peak stress is both sensitive to temperature and strain rate. The experiments show that the modified Arrhenius equation improves the accuracy.