Influence of extrusion deformation on microstructure and mechanical properties of magnesium alloy

Influence of extrusion process parameters,such as blank and die temperature,lubricant,extrusion ratio and extrusion speed on microstructure and mechanical properties of magnesium alloy was studied.Mechanical performance of extruded magnesium alloy tube at high temperature and room temperature and its superplasticity were analyzed.Experimental results show that yield strength,tensile strength and elongation of the magnesium alloy tube at room temperature are 190 MPa,280 MPa and 17%,respectively.At temperature of 400 ℃,elongation of the extruded magnesium alloy reaches 180% with same yield strength and tensile strength,which is 25 MPa.With the increasing of deformation,the mechanical performance of the extruded magnesium alloy also increases.The evolution of microstructure is also analyzed for the magnesium alloy tube after extrusion with different parameters.