Effect of extrusion deformation on microstructures and properties of AZ31 magnesium alloy

The AZ31 material was selected for axisymmetric extrusion tests. After normal hot extrusion, the plasticity of magnesium alloy will be improved, but not noticeably. Further extrusion with extrusion ratio of 6.25 was adopted to commercial AZ31 magnesium alloy rods at different temperatures in order to research the effects of the different extrusion techniques on the elongation. And the correspondence between ductility and crystallite size was studied at the same time. Through experiments, it is proved that the plasticity of AZ31 magnesium alloy reduces with the increase of extrusion temperature. In order to insure the formability, the deformation temperature must reduce as low as it can be.