High strength al-zn alloy and method for producing such an...

C - Chemistry – Metallurgy – 22 – C

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

Patent

CA 2519387

The present invention relates to a high strength AI-Zn alloy product with an improved combination of corrosion resistance and toughness, said alloy comprising essentially (in weight percent): Zn: 6.0 - 9.5, Cu: 1.3 - 2.4, Mg: 1.5 - 2.6, Mn and Zr < 0.25 but preferably in a range between 0.05 and 0.15 for higher Zn contents, other elements each less than 0.05 and less than 0.25 in total, balance aluminium, wherein (in weight percent): 0.1[Cu] + 1.3 < [Mg] < 0.2[Cu] + 2.15, preferably 0.2[Cu] + 1.3 < [Mg] < 0.l[Cu] + 2.15. The invention also relates to a method to produce these alloy products, and to some preferred applications thereof such as upper wing applications in aerospace.

La présente invention concerne un produit d'alliage Al-Zn à haute résistance présentant une combinaison améliorée de propriétés de résistance à la corrosion et de ténacité. Ledit alliage comprend essentiellement (en pourcentage en poids) entre 6,0 et 9,5 % de Zn, entre 1,3 et 2,4 % de Cu, entre 1,5 et 2,6 % de Mg, moins de 0,25 % de Mn et de Zr, mais de préférence entre 0,05 et 0,15 % pour les teneurs en Zn supérieures, moins de 0,05 % de chaque autre élément, et moins de 0,25 % au total d'aluminium d'équilibre. Dans cet alliage (en pourcentage en poids), 0,1[Cu] + 1,3 < [Mg] < 0,2[Cu] + 2,15, et, de préférence, 0,2[Cu] + 1,3 < [Mg] < 0,1[Cu] + 2,15. L'invention concerne également un procédé de production de ces produits d'alliage, ainsi que des applications préférées associées telles que des applications d'ailes supérieures aérospatiales.

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