The as-cast Ti-48Al-2Nb-2Cr alloy was subjected to high temperature hot compressive deformation test by using Gleeble-1500 thermal simulator at 1 050℃to 1 200℃and the strain rate of 0.001 s

-1

to 0.1 s

-1

as well as deformation rate of 60%.The relationship between deformation temperature

strain rate and flow stress during high temperature deformation of the alloy was analyzed.Meanwhile

the active energy of the alloy was calculated.The Arrhenius constitutive model of Ti-48Al-2Nb-2Cr alloy and the constitutive model of multiple linear regression were established.The results reveal that the active energy of the alloy is increased with increasing in temperature and strain rate.The correlation coefficient Rof the Arrhenius constitutive model reaches 0.982 28

and the average relative error is 9.97%.In addition

the relative error within 10% only accounts for 62.0%.The correlation coefficient Rof the constitutive model of Ti-48Al-2Nb-2Cr alloy with multivariate linear regression reaches0.995 66

and the average relative error is 4.76%

meanwhile

the relative error within 10%is 92.6%

presenting a higher constitutive accuracy.