Study on microstructure and mechanical properties of extruded as-cast AZ80 magnesium alloy

In order to study the effect of plastic deformation on microstructure and mechanical properties of as-cast AZ80 magnesium alloy, the experiment of direct extrusion was done to homogenized billets. The microstructure and mechanical properties of original samples and deformed samples were investigated. Experimental results show that homogenization can increase the mechanical properties of as-cast AZ80 magnesium alloy. The grain of as-cast AZ80 magnesium alloy can be dramatically refined by direct extrusion. Comparing with the pre-extruded billet, the tensile strength and elongation of extruded sample can be respectively improved at least 100% and 33%. When the extrusion temperature rises, the elongation of extruded sample will drop and the tensile strength shows a trend of non-continuous change. The influence of extrusion ratio on the mechanical properties of extruded samples is smaller than that of extrusion temperature.