Improved aluminium alloy

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 21/16 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2111706

The invention provides an aluminum alloy material consisting essentially of, by weight percent, 1 % to 1.8 % Cu, 0.8 % to 1.9 % Mg, 0.2 % to 0.6 % Si, 0.5 % to 0.4 % Fe, 0.05 % to 0.30 % Mn, with the balance aluminum with normal impurities. The alloy forms two precipitation phases during heat treatment and age hardening: a beta phase of Mg2Si and an S' phase of Al2CuMg. The alloy has improved formability without significant sacrifice of strength, and is particularly suited to be formed into automobile sheet metal parts such as hood lids, trunks lids, and fenders.

L'invention concerne un matériau en alliage d'aluminium se composant essentiellement de 1 % à 1,8 % en poids de Cu, de 0,8 % à 1,9 % en poids de Mg, de 0,2 % à 0,6 % en poids de Si, de 0,5 % à 0,4 % de Fe, de 0,05 % à 0,30 % en poids de Mn, le reste consistant en de l'aluminium avec des impuretés normales. L'alliage forme deux phases de précipitation lors du traitement thermique et du vieillissement : une phase bêta de Mg2Si et une phase S' de Al2CuMg. Cet alliage possède de meilleures caractéristiques de façonnage sans diminuer de façon significative la résistance, et s'applique notamment à la fabrication de pièces en tôle de carrosseries automobiles, telles que les capots, les coffres, et les pare-chocs.

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