ALUMINIUM ALLOY PRODUCTS HAVING IMPROVED PROPERTY COMBINATIONS AND METHOD FOR ARTIFICIALLY AGING SAME

摘要

Aluminum alloy products about 4 inches thick or less that possesses the a bility to achieve, when solution heat treated, quenched, and artificially ag ed, and in parts made from the products, an improved combination of strength , fracture toughness and corrosion resistance, the alloy consisting essentia lly of: about 6.8 to about 8.5 wt.% Zn, about 1.5 to about 2.00 wt.% Mg, abo ut 1.75 to about 2.3 wt.% Cu; about 0.05 to about 0.3 wt. % Zr, less than ab out 0.1 wt. % Mn, less than about 0.05 wt.% Cr, the balance Al, incidental e lements and impurities and a method for making same. The instantly disclosed alloys are useful in making structural members for commercial airplanes inc luding, but not limited to, upper wing skins and stringers, spar caps, spar webs and ribs of either built-up or integral construction.