Al-cu-mg-si alloy and method for producing the same

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 21/16 (2006.01) B64C 1/12 (2006.01) B64C 3/26 (2006.01) B64G 1/22 (2006.01) C22C 21/14 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2493401

The present invention concerns a balanced AI-Cu-Mg-Si alloy having a high toughness, good strength levels and an improved fatigue crack growth resistance, comprising essentially the following composition (in weight percent): Cu: 3.6 - 4.9, Mg: 1.0 - 1.8, Mn:<= 0.50, preferably < 0.30, Si: 0.10 - 0.40, Zr:<= 0.15, Cr:<= 0.15, Fe:<= 0.10, the balance essentially aluminum and incidental elements and impurities. There is also disclosed a method for producing the balanced AI-Cu-Mg-Si alloy product having a high toughness and an improved fatigue crack growth resistance, and applications of that product as a structural member of an aircraft.

L'invention concerne un alliage équilibré de AI-Cu-Mg-Si qui est caractérisé par une grande ténacité, de bons niveaux de résistance ainsi qu'une meilleure résistance au développement de fissures. Cet alliage est principalement composé (pourcentage en masse) de: Cu: 3,6 4,9, Mg: 1,0 1,8, Mn:<_0,50, de préférence < 0,30, Si: 0,10 0,40, Zr:<_ 0,15, Cr:< 0,15, Fe:<_ 0,10 ; le reste étant essentiellement constitué d'aluminium ainsi que d'impuretés et d'éléments fortuits. Par ailleurs, l'invention concerne un procédé d'obtention de ce produit en alliage équilibré de AI-Cu-Mg-Si, qui est caractérisé par une grande ténacité et une meilleure résistance au développement de fissures. L'invention concerne en outre l'utilisation de ce produit comme élément structural dans un aéronef.

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