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研究了铸态AZ31镁合金在温度为250～425℃、变形量为10%～40%、应变速率为0.01 s-1的条件下的热压缩时动态再结晶的变化规律,分析了流变应力与变形程度的关系。结果表明:铸态AZ31镁合金在应变速率为0.01 s-1的条件下进行热压缩变形,变形程度达到40%时,材料会发生断裂;当应变速率和变形温度一定时,流变应力随变形程度的增大不断增加,在达到峰值后逐渐降低,表现出明显的动态再结晶的特征;且随变形程度的增大,动态再结晶晶粒越来越多。
The dynamic recrystallization changes of as-cast AZ31 magnesium alloy under thermal compression at 250-425 ℃, deformation of 10-40% and strain rate of 0.01 s-1 were studied. The effects of flow stress Relationship with the degree of deformation. The results show that the as-cast AZ31 magnesium alloy undergoes thermal compression deformation under the strain rate of 0.01 s-1. When the deformation degree reaches 40%, the material will fracture. When the strain rate and deformation temperature are constant, the flow stress changes with the deformation The degree of increase continues to increase, and gradually decreases after reaching the peak value, showing obvious characteristics of dynamic recrystallization; and as the degree of deformation increases, more and more dynamic recrystallized grains grow.