Hot Deformation Behavior and Constitutive Relationship of Mg-9Gd-3Y Alloy

In order to get the problem of constitutive relationship in hot plastic deformation of Mg-9Gd-3Y alloy,hot compression deformation tests in a wide range of temperatures(653~753 K) and strain rates(0.01~10 s-1) of Mg-9Gd-3Y alloy were finished.Load/displacement data were employed to establish the true stress vs true strain curves and constitutive equation.Results show that,the dynamic recrystallization occurs in grain boundary easily.The flow stress curves display typical dynamic recrystallization feature and the relationship of stress level with deformation temperature and strain rate.The flow stress data predicted by the constitutive equation agree well with the corresponding experimental results.