Metal treatment – Stock – Age or precipitation hardened or strengthened
Reexamination Certificate
2005-09-07
2008-11-11
King, Roy (Department: 1793)
Metal treatment
Stock
Age or precipitation hardened or strengthened
C420S533000, C420S539000
Reexamination Certificate
active
07449073
ABSTRACT:
The invention provides a 2000 series aluminum alloy having enhanced damage tolerance, the alloy consisting essentially of about 3.0-4.0 wt % copper; about 0.4-1.1 wt % magnesium; up to about 0.8 wt % silver; up to about 1.0 wt % Zn; up to about 0.25 wt % Zr; up to about 0.9 wt % Mn; up to about 0.5 wt % Fe; and up to about 0.5 wt % Si, the balance substantially aluminum, incidental impurities and elements, said copper and magnesium present in a ratio of about 3.6-5 parts copper to about 1 part magnesium. The alloy is suitable for use in wrought or cast products including those used in aerospace applications, particularly sheet or plate structural members, extrusions and forgings, and provides an improved combination of strength and damage tolerance.
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Bray Gary H.
Lin Jen C.
Magnusen Paul E.
Newman John M.
Alcoa Inc.
Borghetti Peter J.
Greenberg & Traurig, LLP
King Roy
Morillo Janelle
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