AZ31镁合金高温变形行为及本构模型

Deformation Behavior and Constitutive Equation of AZ31 Magnesium Alloy at Elevated Temperature

采用Gleeble-3500热模拟实验机,对AZ31镁合金在变形温度为523~723 K、应变速率为0.01~10.00 s-1、最大变形程度为60%的条件下进行热压缩实验。结果表明,流变应力随应变的增加而显著增大,到达峰值后逐渐降低并趋于稳态,变形呈明显的动态再结晶特征。变形温度和应变速率对流变应力影响显著,本文采用包含Arrheniues项的本构方程来描述AZ31镁合金的高温变形行为。

Using Gleeble-3500 thermo-mechanical simulator,hot compression test for AZ3l magnesium alloy at deformation temperatures of 523～723 K and strain rates of 0.01～10.00 s-1 were carried out under maximum strain of 60%.The experimental results show that flow stress increases apparently with strain.Above a critical peak value,flow stress decreases gradually to be a steady state.The characteristic with the dynamic recrystallization occurs during hot compression of AZ3l magnesium alloy.The effects of deformation temperature and strain rate on flow stress are dominating.In this paper,a constitutive equation with Arrheniues item is established to describe the deformation behavior of AZ3l magnesium alloy at elevated temperature.