Extrusion Process Optimization of Magnesium Alloy Containing Titanium

In order to optimize the extrusion process of Mg-5Al-1Zn-0.8Ti magnesium alloy containing titanium, the microstructure and mechanical properties of the samples were tested and analyzed under different extrusion temperatures and extrusion speeds. The results show that with the extrusion temperature increasing from 325 ℃ to 425 ℃ and the extrusion speed increasing from 1 to 5 m/min, the average grain size of the samples decreases first and then increases, and the mechanical properties increase first and then decrease. Compared with the sample extruded at 325 ℃, the average grain size reduces by 34%, the tensile strength and yield strength respectively increase by 24% and 29%, while the elongation after fracture decreases by 28%, for the sample extruded at 400 ℃. Meanwhile, compared with the sample extruded at 1 m/min of speed, the average grain size decreases by 26%, the tensile strength and yield strength separately increase by 12% and 14%, while the elongation after fracture decreases by 21%, for the sample extruded at 3 m/min. The optimum extrusion process parameters of Mg-5Al-1Zn-0.8Ti alloy are determined at 400 ℃and 3 m/min of speed.