| 摘要 |
An aluminum based alloy useful in aircraft and aerospace structures which has low density, high strength and high fracture toughness consists essentially of the following formula: CuaLibMgcAgdZreAlbal wherein a, b, c, d, e and bal indicate the amount in wt. % of alloying components, and wherein 2.4<a<3.5, 1.35<b<1.8, 0.25<c<0.65, 0.25<d<0.65 and 0.08<e<0.25, and the alloy has a density of 0.0945 to 0.0960 lbs/in3. Preferably, the relationship between the copper and lithium components also meets the following tests: more preferably the relationship meets the following tests: 6.5<a+2.5b<7.5, 2b-0.8<a<3.75b-1.9.
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