High strength, chromium-and lithium-free aluminum casting alloy and related vehicular structural components

There is claimed a high strength, aluminum alloy composition especially suited for cast vehicular structural components. This chromium- and lithium-free, alloy consists essentially of: about 3-3.6 wt. % zinc, about 1.3-1.6 wt. % magnesium, about 0.2-0.8 wt. % manganese, about 0.08-0.16 wt. % zirconium, up to about 0.3 wt. % copper, up to about 0.15 wt. % silicon, and up to about 0.25 wt. % iron, the balance aluminum, incidental elements and impurities. It exhibit a typical tensile yield strength greater than about 29 ksi without having to undergo T6-type thermal processing.