High fracture toughness aluminum-copper-lithium sheet or...

Details High fracture toughness aluminum-copper-lithium sheet or... High fracture toughness aluminum-copper-lithium sheet or...

2006-06-05

2010-06-29

King, Roy (Department: 1793)

Metal treatment

Stock

Age or precipitation hardened or strengthened

C148S693000, C148S700000, C420S533000, C420S539000

Reexamination Certificate

active

07744704

ABSTRACT:
A low density aluminum based alloy useful in aircraft structure for fuselage sheet or light-gauge plate applications which has high strength, high fracture toughness and high corrosion resistance, comprising 2.7 to 3.4 weight percent Cu, 0.8 to 1.4 weight percent Li, 0.1 to 0.8 weight percent Ag, 0.2 to 0.6 weight percent Mg and a grain refiner such as Zr, Mn, Cr, Sc, Hf, Ti or a combination thereof, the amount of which being 0.05 to 0.13 wt. % for Zr, 0.1 to 0.8 wt. % for Mn, 0.05 to 0.3 wt. % for Cr and Sc, 0.05 to 0.5 wt. % for Hf and 0.05 to 0.15 wt. % for Ti. The amount of Cu and Li preferably corresponds to the formula Cu(wt. %)+5/3 Li(wt. %)<5.2.

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