High strength aluminum alloy resistant to exfoliation and method

Details High strength aluminum alloy resistant to exfoliation and method High strength aluminum alloy resistant to exfoliation and method

1988-12-07

1990-09-04

Yee, Deborah

Metal treatment

Stock

Age or precipitation hardened or strengthened

148 127A, C22C 2110, C22F 1053

Patent

active

049541889

ABSTRACT:
A method is provided for producing a high strength aluminum alloy characterized by improved resistance to exfoliation. The method comprises providing an aluminum-base alloy comprising 5.9 to 8.2 wt. % zinc, 1.5 to 4.0 wt. % magnesium, 1.5 to 3.0 wt. % copper, less than 0.001 wt. % boron not more than 0.04 wt. % chromium, and 0.5 wt. % maximum other alloying elements such as zirconium, manganese, iron, silicon and titanium, with the balance consisting of aluminum, working the alloy into a product of predetermined shape, solution heat treating the shaped product, quenching, and aging the heat treated and quenched product to a temperature of from above 270.degree. F. to 285.degree. F. for a period of from 6 to 30 hours.

REFERENCES:
patent: 2403037 (1946-07-01), Zeigler et al.
patent: 3762916 (1973-10-01), Kirman

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