Al-Cu-Li-Mg-Ag-Mn-Zr alloy for use as structural members...

Details Al-Cu-Li-Mg-Ag-Mn-Zr alloy for use as structural members... Al-Cu-Li-Mg-Ag-Mn-Zr alloy for use as structural members...

2007-06-12

2007-06-12

King, Roy (Department: 1742)

Metal treatment

Stock

Age or precipitation hardened or strengthened

C420S533000, C420S539000

Reexamination Certificate

active

10853721

ABSTRACT:
An improved aluminum lithium alloy comprising 0.1 to 2.5 wt. % Li, 2.5 to 5.5 wt. % Cu, 0.2 to 1.0 wt. % Mg, 0.2 to 0.8 wt. % Ag, 0.2 to 0.8 wt. % Mn, up to 0.4 wt. % Zr or other grain refiner such as chromium, titanium, hafnium, scandium or vanadium, the balance aluminum. The present alloy exhibits an improved combination of strength and fracture toughness, over any thickness range. The present invention is further directed to methods for preparing and using Al—Li alloys as well as to products comprising the same.

REFERENCES:
patent: 5032359 (1991-07-01), Pickens
patent: 5234662 (1993-08-01), Balmuth
patent: 5389165 (1995-02-01), Cho
“International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys”, Aluminum Assocation, 1997, p. 5, 12.

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