Aluminum Company of America

Bernard W Lifka

John Liu

William D Vernam

William G Truckner

Roger D Doherty

Ralph W Rogers, Jr

An improved aluminum base alloy product is disclosed, the product comprising 0 to 3.0 wt. % Cu, 0 to 1.5 wt. % Mn, 0.1 to 4.0 wt. % Mg, 0.8 to 8.5 wt. % Zn, at least 0.005 wt. % Sr, max. 1.0 wt. % Si, max. 0.8 wt. % Fe and max. 0.45 wt. % Cr, 0 to 0.2 wt. % Zr, the remainder aluminum and incidental elements and impurities.

Aluminum base alloys of the A1-Cu-Mg-Zn type

A method including providing aluminum having particles for stimulating nucleation of new grains, and deforming the aluminum under conditions for causing recrystallization to occur during deformation or thereafter, without subsequent heating being required to effect recrystallization.

Metal working method

A shaped aluminum article is disclosed characterized by a yield strength of over 414 MPa (60 ksi) and good corrosion resistance when aged to a T76 temper. The article is formed from an aluminum base alloy having good formability in an annealed state, and sufficiently low quench sensitivity to permit air quenching. The alloy consists essentially of: 6.5. to 7.5 wt. % zinc, 2.4 to 3.0 wt. % magnesium, 0.0 to 0.8 wt. % copper, and 0.01 to 0.18 wt. % zirconium, with the following maximum amounts of other alloying ingredients or impurities: 0.2 wt. % silicon, 0.4 wt. % iron, 0.1 wt. % manganese, 0.05 wt. % chromium, 0.06 wt. % titanium, and 0.05 wt. % maximum each other alloying ingredient or impurity with a total maximum of 0.15 wt. %, the balance consisting of aluminum.

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New Kensington, PA, United States of America

Bernard W Lifka