Constitutive equation and processing maps of 6013 aluminum alloy based on corrected flow stress
Based on the original true stress-strain curves of hot compression of 6013 aluminum alloy,the Arrhenius constitutive equation after strain correction was established on the basis of friction and temperature correction,and the error analysis of the model was carried out.According to the theory of dynamic material model and Prasad instability criterion,the processing map of 6013 aluminum alloy was established under the condition of deformation temperature of 530-575℃and strain rate of 0.001-0.1 s-1.The results show that the strain modified Arrhenius constitutive equation after both friction and temperature correction has higher prediction accuracy.The correlation coefficient between the predicted and experimental values of flow stress is 0.997,the average absolute error is 0.3 MPa,and the average relative error is only 3.06%.There is no instability phenomenon in the whole deformation process,and the power dissipation efficiency η is above 0.3.The dynamic recrystallization is the main softening mechanism.As the power dissipation efficiency η increases from 0.32 to 0.36,the morphology of the grains changes from flat to equiaxed,and the average equivalent circle size of the grains gradually decreases.The temperature of 560-575℃and strain rate of 0.03-0.1 s-1 are optimal parameters to refine grains after deformation.
metal materials6013 aluminum alloyArrhenius constitutive equationprocessing map
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