Abstract
Magnesium alloy is the lightest metal in practical use and it is an effective material to contribute the weight saving for vehicles and other transportation equipment. In this study, to achieve a high strength due to grain refinement of AZ80 magnesium alloy that is used in high strength and low ductility sheet material in AZ series Magnesium alloy, forging and rolling was applied. As a result of examining deformation behavior under the uniaxial and biaxial tension at various temperatures, elongation of the biaxial is decreased compared to those of uniaxial due to deformation restraint at each temperature. Furthermore, the yield stress measured value showed a value close to Hill's 93 yield function at each temperature. In addition, the shape of the yield surface at more than 423 K showed an ellipsoidal shape. But, the shape of the yield surface had a distorted shape at room temperature because anisotropy appeared clearly.
