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The objective of this study was to experimentally determine the properties of magnesium alloys during plastic deformation under various temperature regimes. Proportional loading tests combining both axial and torsional loads were performed on cylindrical AZ31 Mg alloys in a range from room temperature to 673 K, where superplasticity has a high probability of occurrence, and the crystalline structures of the samples were observed after these tests. The above observations indicate that the deformation mechanisms in AZ31 Mg alloy are dominated by twinning deformation at 300 K and 423 K, and by grain boundary sliding promoted by dynamic recrystallization at 523 K and higher temperatures. [ABSTRACT FROM AUTHOR]