在应变速率为0.01～50 s-1、温度为300～450 ℃的条件下,在Gleeble-3500热模拟机上对AZ80镁合金的高温热压缩变形特性进行研究.实验得出变形过程中的真应力应变曲线,并利用本构方程对流变应力值进行修正,进而利用修正后的应力值得出本实验本构方程中的系列常量;实验还分析温度、应变速率及应变量对微观组织的影响.结果表明:变形过程中的应力值随温度的升高而降低,随应变速率的升高而升高,且修正后的应力值高于未修正值;变形过程中发生动态再结晶且晶粒平均尺寸随变形参数的不同而改变,其自然对数随Zener-Hollomon(Z)参数的自然对数的升高呈线性降低.
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