Prediction of high temperature flow stress of Cu-Sn alloy by modified Zerilli-Armstrong model
Under the conditions of deformation temperature of 823-973 K,strain rate of 0.001-1 s-1 and true strain of 0.9,hot compression experiments were conducted on Cu-Sn alloy using Gleeble-3500 thermal simulation testing machine to analyze its hot deformation behavior.Based on the hot compression experimental results of Cu-Sn alloy,a modified Zerrilli-Armstrong model was established using multiple linear regression to describe the hot deformation characteristics of the alloy.The correlation coefficient(R)and average absolute relative error(AARE)were introduced to evaluate the accuracy of the model.The results show that the flow stress of the Cu-Sn alloy is significantly affected by deformation temperature and strain rate,the flow stress increases with the increase of strain rate and the decrease of deformation temperature,and the serrated jitter of the flow stress is the result of the competition between work hardening and flow softening.The R and AARE values of the predicted stress values of the modified Zerelli-Armstrong model and experimental stress values are 0.986 and 7.12%,respectively,indicating that the model has high accuracy and can accurately describe the high-temperature flow behavior of the Cu-Sn alloy.
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