Abstract:As the most promising aerospace high temperature structural materials, Ti2AlNb alloys have high specific strength and good high temperature creep properties. The high temperature mechanical behavior and recrystallization behavior of Ti-22Al-26Nb alloy were studied. A high temperature constitutive model of the alloy was established .The dynamic recrystallization multi-stress peak curve was analyzed by fitting the experimental results. The results show that it is feasible to establish the high temperature constitutive model of Ti-22Al-26Nb alloy based on the hyperbolic sine function, which can describe the high nonlinearity of the thermodynamic parameters of Ti-22Al-26Nb alloy at high temperature complex relationship, the maximum error is 2.6%. From the modified Avrami equation, it is predicted that the recrystallization volume fraction and the strain show a recrystallization kinetics growth trend, and the complex softening behavior of the alloy during high temperature deformation is revealed.