Effect of intersection annealing on the microstructure and compressive properties of pure Mg processed by four-pass ambient ECAP

Intersection annealing (different time and temperature) was carried out on Fe-clad pure Mg bars processed by four-pass ambient equal channel angular pressing (ECAP). Microstructures, textures and compressive properties of the as-annealed samples were investigated in detail. The results indicate that average grain size is the finest after intersection annealing at 150 °C × 30 min. Texture intensity after intersection annealing at 200 °C × 30 min is the strongest due to preferred grain growth. Compressive yield strength (CYS) is the best after intersection annealing at 150 °C × 30 min, ultimate compressive strength (UCS) and compressive strains (CS) all decrease with increasing grain size due to elevated annealing temperatures.