Tailoring texture and refining grain of magnesium alloy by differential speed extrusion process

Magnesium alloy sheets were processed by conventional extrusion (CE) and differential speed extrusion (DSE). The velocity evolutions of DSE sheets at near-surface and mid-layer region are different due to the extra asymmetric shear deformation. This simple shear enforces the near-surface microstructure to exhibit more dynamically recrystallized grains having the c-axis tilted about ±12° toward the extrusion direction. Grain refinement and tilted weak basal texture obtained by DSE process dramatically enhance the room temperature strength and plasticity of the extruded Mg alloy sheets.