Microstructure and mechanical properties of Mg–8Al alloy fabricated by room-temperature multi-directional forging

As-extruded Mg–Al alloy was multi-directionally forged (MDFed) at room temperature to cumulative strain of ΣΔϵ = 2.0 at maximum by employing a pass strain of Δϵ = 0.1. The coarse initial grains were subdivided gradually to ultra-fine ones by mechanical twinning. The MDFed Mg alloy showed superior mechanical properties of 530 MPa yield and 650 MPa ultimate tensile strengths with ductility of 9%. The relatively large ductility was induced by grain orientation randomization due to multiple twinning and the small pass strains which suppressed the sharp basal-texture evolution.