Dynamic Recrystallization Behaviors and the Texture Evolution in Mg–9Al–1Zn Alloy Produced by ECAP at Different Temperatures

The influence of changes in temperature from 250 to 400 °C with 50 °C intervals during ECAP processing on the texture evolution and recrystallization behavior for Mg–9Al–1Zn alloy was studied. The results demonstrate that {10 \({\overline{\text{1}}}\) 2} extension twins and dislocation slip are the dominating deformation modes in low temperature (250 °C and 300 °C) ECAP processing, and those twins gradually disappear with increasing temperature. Most of the recrystallized grains are observed to exhibit (0001) poles 70°–90° away from the normal direction due to reorientation of the grains caused by twins and dislocation slips, with the texture changing from a strong basal texture to the texture component close to {\({\overline{\text{1}}}\) 2 \({\overline{\text{1}}}\) 0} and {01 \({\overline{\text{1}}}\) 0}. The production of ultrafine recrystallized grains in the specimens treated by ECAP at 400 °C was aided by grain fragmentation caused by twins interaction, as well as dislocation slip and temperature increase during severe plastic deformation (SPD).