Abstract
A comparative study was carried out on the hot flow stress of AZ31, AZ61, and AZ91 magnesium alloys. Their hot working behaviors were studied through constitutive analysis based on a simple physically-based approach which accounts for the dependence of the Young's modulus and the self-diffusion coefficient of magnesium on temperature. Since the main difference between these alloys is the difference in their amount of aluminum, the differences in constitutive behavior were quantitatively characterized by relating the hot flow stress to amount of Al, which was not possible without the consideration of physically-based parameters. It was concluded that the used approach in the current work can be considered as a versatile tool in future hot working and alloy development studies.