Prediction of high temperature rheological behavior of TC4 titanium alloy based on Z-A constitutive model
The constitutive model plays an important role in describing the response behavior of materi-als under different deformation conditions and in optimizing the hot forming process.Therefore,in or-der to obtain the physical constitutive model for accurately describing the high temperature rheological behavior of TC4 titanium alloy,the isothermal compression experiments were performed under differ-ent temperatures(500～900 ℃)and different strain rates(0.01,0.1,1 s-1)by using the Gleeble-3800 thermal simulator.According to the experimental data,the parameters of modified Z-A constitutive model are calibrated,and its effectivity is analyzed.Based on the analysis results,an optimized Z-A constitutive model was established,and the predictability of the model was discussed with the help of correlation coefficient R,mean absolute relative error value AARE and root mean square error RSME.The results indicate that the optimized Z-A constitutive model can accurately predict the high-temperat-ure rheological behavior of the material.The R,AARE and RSME of the model are 0.999 2,1.63％and 1.325 2,respectively.
TC4 titanium alloyhigh temperature rheological behaviorZ-A constitutive model
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