High strength ultrafine/nanostructured aluminum produced by back pressure equal channel angular processing Available to Purchase

High strength ultrafine/nanograined aluminum materials with ultimate strength up to $740MPa$ and Vickers microhardness up to $2285MPa$ were produced using back pressure equal channel angular processing of ultrafine-sized aluminum powder at $400°C$⁠. Microstructure analyses revealed that the attained high strength and microhardness were derived from the presence of nanosized aluminum and $γ$-alumina grains $(5–10nm)$ as well as residual amorphous alumina. The interaction between the severe shear deformation and the preexisting amorphous alumina, concurrent oxidation, and amorphous to $γ$-alumina transition was considered to be responsible for the formation of such a refined and complex nanostructure.