抄録
The magnesium alloy used here attracts attention as one of the most light-weight metals in practical use. However, the magnesium alloy has strong anisotropy due to crystal structure itself and shows specialized mechanical properties because of the texture formed by plastic working processes such as rolling and extrusion. In this study, we investigated the plastic deformation of the fine grained AZ61 magnesium alloy which obtained by severe strain processing with rolling after multi-axial alternating forging. In particular, to evaluate plastic work formability of these materials, mechanical properties at high temperature under uni-axial tensile test and bi-axial deformation behaviors in the punch stretch test by the method of Nakajima were examined. It was possible to determine the temperature dependence of the forming limit diagram in a different stress state of AZ61 fine grained magnesium material. Comparing the results of the FEM formability analysis based on experimental stress-strain curves, Predicted numerical and experimental results of formability were in good agreement.
