Low density, high strength al-li alloy having high toughness...

Details Low density, high strength al-li alloy having high toughness... Low density, high strength al-li alloy having high toughness...

C - Chemistry, Metallurgy

22

C

C22C 21/12 (2006.01) C22F 1/04 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2135790

An aluminum-based alloy useful in aircraft and aerospace structures which has low density, high strength and high frac- ture toughness consists essentially of the following formula: Cu a Li b Mg c Ag d Zr e Al bal, wherein a, b, c, d, e and bal indicate the amount in wt.% of alloying components, and wherein 2.8 < a < 3.8; 0.80 < b < 1.3, 0.20 < c < 1.00, 0.20 < d < 1.00 and 0.08 < a < 0.40. Preferably, the copper and lithium components are controlled such that the combined copper and lithium content ate kept below the solubility limit to avoid loss of fracture toughness during elevated temperature exposure. The relationship be- tween the copper and lithium contents also should meet the following relationship: Cu (wt.%) + 1.5 Li (wt.%) < 5.4.

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