Abstract
The thermal compression test of Ti-22Al-26Nb-2Ta-0.5Y alloy was performed using a Gleeble-3500 thermal simulator at deformation temperatures ranging from 900°C to 1150°C and strain rates ranging from 0.001s-1 to 10s-1. The results show that the flow stress of Ti-22Al-26Nb-2Ta-0.5Y alloy increases with the increase of deformation rate and decreases with the increase of deformation temperature. Based on the peak stress, the Arrhenius type constitutive model of Ti-22Al-26Nb-2Ta-0.5Y alloy was constructed using Zener-Hollomon parameters. The results show that this constitutive model has good prediction accuracy for peak stress. The correlation coefficient between the predicted value and the experimental value is R = 0.9922, the average relative error E is 8.36%, and the deviation within 15% accounted for about 96.67% of the total validation data points. This study provided a reference for the formulation of the hot working processing scheme for Ti-22Al-26Nb-2Ta-0.5Y alloy and the application of the Z-parameter constitutive model.
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