Metal treatment – Stock – Age or precipitation hardened or strengthened
Reexamination Certificate
2005-02-07
2011-12-27
King, Roy (Department: 1733)
Metal treatment
Stock
Age or precipitation hardened or strengthened
C420S532000
Reexamination Certificate
active
08083870
ABSTRACT:
Aluminum alloy products, such as plate, forgings and extrusions, suitable for use in making aerospace structural components like integral wing spars, ribs and webs, comprises about: 6 to 10 wt. % Zn; 1.2 to 1.9 wt. % Mg; 1.2 to 2.2 wt. % Cu, with Mg≦(Cu+0.3); and 0.05 to 0.4 wt. % Zr, the balance Al, incidental elements and impurities. Preferably, the alloy contains about 6.9 to 8.5 wt. % Zn; 1.2 to 1.7 wt. % Mg; 1.3 to 2 wt. % Cu. This alloy provides improved combinations of strength and fracture toughness in thick gauges. When artificially aged per the three stage method of preferred embodiments, this alloy also achieves superior SCC performance, including under seacoast conditions.
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Chakrabarti Dhruba J.
Goodman Jay H.
Krist Cynthia M.
Liu John
Sawtell Ralph R.
Alcoa Inc.
Greenberg & Traurig, LLP
King Roy
Morillo Janelle
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