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AssigneeConstellium Issoire
InventorsRicky Whelchel, Mathieu Revil-Baudard, Philippe Jarry, Bernard Bes, Fanny Mas
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An aluminium alloy comprising lithium with improved mechanical strength and toughness. The invention relates to a 2XXX wrought alloy product comprising from 0.05 to 1.9% by weight of Li and from 0.005 to 0.045% by weight of Cr and/or of V. The invention also relates to an as-cast 2XXX alloy product comprising from 0.05 to 1.9% by weight of Li and from 0.005 to 0.045% by weight of Cr and/or of V. Finally, the invention relates to an aircraft structure element, preferably a lower surface or upper surface element, the skin and stiffeners of which originate from the same starting material, a spar or a rib, comprising a wrought product.
A rolled, extruded and/or forged 2XXX alloy product having a thickness of 30 to 110 mm with an aluminum base comprising, by weight, from 0.80 to 0.95% Li, from 0.025 to 0.041% Cr and/or V, from 3.2 to 4.0% Cu, from 0.15 to 0.7% Mg, from 0.07 to 0.15% Zr, from 0 to 0.6% Mn, <0.8% Zn, from 0 to 0.5% Ag, Fe+Si≤0.2%, and at least one element that contributes to control of grain size, selected from Hf, Ti, Sc, and other rare earth elements, wherein Hf if present is at from 0.02 to 0.5%, Ti if present is at from 0.01 to 0.15%, and Sc if present is at from 0.02% to 0.1%;
Dependencies are inferred from the claim text.