Study on hot deformation behavior and hot processing map of AlMg4.5 MnZr alloy
The hot simulation compression tests were conducted on Gleeble-3500 thermo-mechanical simulator to analyze the high-temper-ature flow behavior and microstructural evolution of AlMg4.5MnZr alloy at deformation temperatures of 300-500℃,strain rates of 0.01-10 s-1 and deformation of 60%.The constitutive equation and hot processing map for the thermal deformation of AlMg4.5MnZr alloy were established,and electron backscatter diffraction(EBSD)technique was used to verify and analyze the microstructure of AlMg4.5 MnZr al-loy after hot processing.The results show that the alloy exhibits positive strain rate sensitivity.Within a certain range,the higher the de-formation temperatures,the lower the strain rates,the more pronounced the dynamic recrystallization characteristics of the alloy.The es-tablished Arrhenius constitutive equation was used to predict the flow stress values of the alloy under different deformation conditions,and the predicted values matched well with the experimental test values.The hot processing map of the AlMg4.5MnZr alloy shows only one un-stable region,indicating wide range of processability.The optimal processing parameters are determined to be:deformation temperatures of 440-500℃and strain rates of 0.01-0.1 s-1.
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