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US 4,735,774 AGranted
Aluminum-lithium alloy (4)
AssigneeThe Boeing Company
InventorsG. Hari Narayanan, William E. Quist, R. Eugene Curtis
Life of this patent
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Abstract
An aluminum-lithium alloy exhibiting good fracture toughness and relatively high strength has a nominal composition of 2.5 percent lithium, 1.0 percent magnesium, 1.6 percent copper, 0.12 percent zirconium with the balance being aluminum and trace elements.
Claims10
An aluminum-lithium ingot metallurgy alloy exhibiting good fracture toughness consisting essentially of
- ______________________________________ Element Amount (wt. %) ______________________________________ Li 2.3 to 2.7 Mg 0.8 to 1.2 Cu 1.3 to 1.9 Zr 0.15 max Fe 0.15 max Si 0.12 max Other trace 0.25 max elements Al Balance. ______________________________________
Dependencies are inferred from the claim text.