Precipitation-hardened aluminum alloys for automotive...

C - Chemistry – Metallurgy – 22 – C

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C22C 21/08 (2006.01) C22C 21/14 (2006.01) C22C 21/16 (2006.01) C22F 1/047 (2006.01) C22F 1/05 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2231870

An aluminum alloy containing the following elements in the stated amounts: 0.6 <=MG <= 0.9; 0.25 <=Si <= 0.6; 0.25 <=Cu <= 0.9; Fe <= 0.4; Mn <= 0.4; the total of the amounts of Cu, Si and Mg being, in atomic weight percent, more than 1.2 % and less than 1.8 %. These alloys may be subjected to homogenization at about 470 to 560 °C for more than four hours, hot rolling at a temperature in the range of 400 to 580 °C, cold rolling, solutionizing at a temperature in the range of 470 to 580 °C, and natural aging at ambient temperature. The alloys may then be used as structural components for all aluminum vehicles and may be recycled with other aluminum alloys used in such vehicles.

Alliage d'aluminium contenant les éléments suivants dans les quantités citées: 0,6 </=Mg </= 0,9; 0,25 </=Si </= 0,6; 0,25 </=Cu </= 0,9; Fe </= 0,4; Mn </= 0,4; le total des quantités de Cu, Si et Mg étant, en pourcentage de masse atomique, supérieur à 1,2 % et inférieur à 1,8 %. Ces alliages peuvent être soumis à homogénéisation à environ 470 à 560 DEG C pendant plus de quatre heures, au laminage à chaud à une température de l'ordre de 400 à 580 DEG C, au laminage à froid, au traitement par solution à une température de l'ordre de 470 à 580 DEG C, et au vieillissement naturel à température ambiante. Les alliages peuvent ensuite être utilisés comme éléments structuraux pour tous les véhicules en aluminium, et peuvent être recyclés avec d'autres alliages d'aluminium utilisés dans ces véhicules.

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