Aluminum alloy products and artificial aging method

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 21/10 (2006.01) C22F 1/053 (2006.01)

Patent

CA 2432089

Alluminum alloy products, such as plate, forgings and extrusions, suitable for use in making aerospace structural components like integral wing spars, ribs and webs, comprises about: 6 to 10 wt.%Zn; 1.2 to 1.9 wt.% Mg; 1.2 to 2.2 wt.% Cu, with Mg (Cu+0.3); and 0.05 to 0.4 wt. % Zr, the balance Al, incidental elements and impurities. Preferably, the alloy contains about 6.9 to 8.5 wt.% Zn; 1.2 to 1.7 wt.% Mg; 1.3 to 2 wt.% Cu. This alloy provides improved combinations of strength and fracture toughness in thick gauges. When artificially aged per the three stage method of preferred embodiments, this alloy also achieves superior SCC performance, including under seacoast conditions.

L'invention porte sur des produits en alliage d'aluminium tels que les plaques, les pi­ces forg~es et les extrusions, utilis~s dans la fabrication de composants structuraux, dans l'industrie a~rospatiale, tels que les longerons d'aile, les nervures et les ~mes. Ces produits contiennent : 6 ~ 10 % en poids de Zn ; 1,2 ~ 1,9 % en poids de Mg ; 1,2 ~ 2,2 % en poids de Cu, avec du Mg (Cu + 0,3) ; et 0,05 ~ 0,4 en poids de Zr, le reste ~tant fait de Al, d'~l~ments al~atoires et d'impuret~s. De pr~f~rence, cet alliage contient environ 6,9 ~ 8,5 % en poids de Zn ; 1,2 ~ 1,7 % en poids de Mg ; 1,3 ~ 2 % en poids de Cu et pr~sente des combinaisons am~lior~es de force et de r~sistance aux fractures dans les jauges ~paisses. Lorsqu'il est artificiellement vieilli au cours du proc~d~ en trois ~tapes selon un mode de r~alisation pr~f~r~, cet alliage permet ~galement d'atteindre une meilleure efficacit~ SCC (fissuration par corrosion sous contrainte), y compris en milieu maritime.

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