High-strength aluminum-copper-lithium sheet metal for...

C - Chemistry – Metallurgy – 22 – C

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

Patent

CA 2608971

The invention relates to an aluminum-based alloy having a low density that is useful in an aircraft structure for fuselage sheet metal applications that have a high mechanical resistance, a high level of strength and a high resistance to corrosion, containing in % by weight, 2.7 to 3.4 of Cu, 0.8 to 1.4 of Li, 0.1 to 0.8 of Ag, 0.2 to 0.6 of Mg and an element such as Zr, Mn, Cr, Sc, Hf, Ti or a combination thereof, of which the quantity, in % by weight, is 0.05 to 0.13 for Zr, 0.05 to 0.8 for Mn, 0.05 to 0.3 for Cr and Sc, 0.05 to 0.5 for Hf and 0.05 to 0.15 for Ti. The quantity of Cu and of Li is determined according to the formula Cu ( % by weight) + 5/3 Li ( % by weight) < 5.2.

Un alliage à base d'aluminium de faible masse volumique utile dans une structure d'aéronef pour les applications de tôle de fuselage qui a une résistance mécanique élevée, une haute ténacité et une haute résistance à la corrosion, comprenant en % en poids, 2,7 à 3,4 de Cu, 0,8 à 1,4 de Li, 0,1 à 0,8 de Ag, 0,2 à 0,6 de Mg et un élément tel que Zr, Mn, Cr, Sc, Hf, Ti ou une combinaison de ceux-ci, dont la quantité, en % en poids, est de 0,05 à 0,13 pour Zr, 0,05 à 0,8 pour Mn, 0,05 à 0,3 pour Cr et Sc, 0,05 à 0,5 pour Hf et 0,05 à 0,15 pour Ti. La quantité de Cu et de Li est déterminée selon la formule Cu (% en poids) + 5/3 Li (% en poids) < 5,2.

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