Formation of a nanocomposite-like microstructure in Mg-6Al-1Zn alloy

This study describes the development of a nanocomposite-like microstructure in a commercial Mg-6Al-1Zn alloy with ∼6 vol.% of Mg17Al12 (β) through severe plastic deformation via high-ratio differential speed rolling. During the rolling process, a large number of very small spherical β particles (average size of 140 nm) were dynamically precipitated on grain boundaries and dislocations in grain interiors. The processed materials showed superior strength and ductility compared to many other magnesium nanocomposites produced by ex situ methods.