Research On Tensile Deformation And Hot Processing Maps Of AZ31 Magnesium Alloy Sheet

In order to optimize the processing parameters of the AZ31 magnesium alloy sheets in deep drawing manufacturing,good understanding the study of the theory of tensile deformation mechanism, material microstructure evolution and the influence of different area in thermal processing map.This subject studied the high temperature tensile deformation behavior and the microstructure changes in tensile deformation process of AZ31 magnesium alloy with the thicknesses 1.2mm and 7mm respectively. Construct the constitutive equations and hot processing map(T=200 ℃ ~450 ℃, ? =0.001s-1~0.1s-1), we discussed the variation of different regional organizations in thermal processing map.Get the best processing parameters of the AZ31 magnesium alloy sheet.The main conclusions are as follows:1)True stress-true strain curve showed typical characteristics of dynamic recrystallization,with the decreased deformation temperature and increases strain rate can cause the reduction of flow stress.2)The deformation activation energy of AZ31 magnesium alloy are between 108~194KJ/mol,for different thickness of the AZ31(1.2mm,7mm)the activation energy are 143KJ/mol and 156KJ/mol respectively.3)Describe the constitutive equations with hyperbolic sine function of the 1.2mm thickness AZ31 magnesium alloy as below:4)The best hot forming process parameter of the 1.2mm thickness AZ31 magnesium alloy sheet with:T=280~325℃,e&=0.01~0.1s-1,ηmax=35%.The best hot forming process parameter of the 7.0mm thickness AZ31 magnesium alloy sheet with:T=325~380℃,e&=0.01~0.1s-1,ηmax=35%.