Hot extrusion deformation of AZ31 magnesium alloy and mechanics performance analysis

In order to know the production technics of magnesium alloy tube with high accuracy,the isothermal extrusion process of AZ31 magnesium alloy tube was investigated by 630 t extruder,tensile machine,microscopy and transmission electron microscope(TEM). The casting was homogenized before extrusion deformation. The tube with precise size,low roughness and little wall thickness difference was received during the trial-manufacture of the thin-wall extruded tube of AZ31 magnesium alloy. AZ31 magnesium alloy was hot extruded under different conditions,and the microstructure and mechanical properties and dimensions accuracy of the alloy were investigated. The results show that the tensile strength and yield strength and elongation percentage of samples ,that extruded at 623±20 K and annealed at 523 K×3 h are 270 MPa,175 MPa and 23.1% respectively.