A new method of processing magnesium alloy thin-walled tube by direct extrusion and corrugated equal channel angular extrusion

Due to demand of strong toughness of thin-walled tube, and good secondary forming properties and high-precision dimension, new plastic-forming method should be researched to achieve a complete filling, uniform deformation, and microstructural evolution during forming process. The deformation mechanisms of a new composite extrusion for thin-walled tube fabricated by direct extrusion and corrugated equal channel angular extrusion has been researched which is shorten as "TC-ECAE" in this paper. The plastic deformation behavior of magnesium billet during TC-ECAE process was researched by DEFORM (TM)-3D software. Calculation parameters include material properties and process conditions have been taken into consideration. The predictions of strain distributions and damage distributions, and effective stresses distributions and flow velocities distributions have been explored. The results showed that TC-ECAE process is a magnesium alloy tube forming method suitable for industrial mass production. Serve plastic deformation of TC-ECAE would promote dynamic recrystallization which is magnesium alloy.