Microstructural evolution of ultra-fine grained Mg-6.62Zn-0.6Zr alloy on the basis of adiabatic rise in temperature under dynamic loading

A fiber textured, {-1010}<-1-121> dominated component, ultrafine-grained Mg-Zn-Zr alloy was extruded at a temperature 350 °C with extrusion ratio ~30. The influence of the rise in temperature on twinning and texture behavior were investigated at high strain rate compression ranges (2149 s⁻¹ to 4289 s⁻¹) along the extruded direction. The characteristic sigmoidal curves show considerable grains re-orientation due to the signature of {10–12}<10–11> extension twinning, that causes very high flow stress of 572 MPa and nearly a strong basal texture was developed. A feasible mathematical analysis was used to find out the rise in temperature. A large increase in temperature ~212.9°C in the specimen's body was found that cause the low fraction of twining owing to non-basal slips activity. While a rise in temperature ~334°C was found inside the adiabatic shear band and edges of crack which is equal to the temperature required for dynamic recrystallization.