Hot deformation behavior and Zener-Hollomon parameter constitutive model of Ti-22Al-26Nb-2Ta-0.5Y alloy

6th Annual International Conference on Material Science and Engineering

Chen, Xuhuai^1 ; Wang, Kulu^1 ; Li, Xin^1 ; Zhou, Feng^1 ; Wan, Peng^1

School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, JIANGXI

330063, China^1

关键词: Average relative error;    Correlation coefficient;    Deformation temperatures;    Experimental values;    Hot deformation behaviors;    Prediction accuracy;    Thermal compressions;    Zener-Hollomon parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/397/1/012010/pdf
DOI  :  10.1088/1757-899X/397/1/012010

来源: IOP

【 摘 要 】

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.