An al-si-mg-zn-cu alloy for aerospace and automotive castings

C - Chemistry – Metallurgy – 22 – F

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C22F 1/043 (2006.01) C22C 21/02 (2006.01)

Patent

CA 2574962

The present invention provides an aluminum casting alloy with a composition including 4% - 9% Si; 0.1% - 0.7% Mg; less than or equal to 5% Zn; less than 0.15% Fe; less than 4% Cu; less than 0.3% Mn; less than 0.05% B; less than 0.15% Ti; and the remainder consisting essentially of aluminum. The inventive AlSiMg composition provides increased mechanical properties (Tensile Yield Strength and Ultimate Tensile Strength) in comparison to similiarly prepared E357 alloy at room temperature and high temperature. The present invention also includes a shaped casting formed from the inventive composition and a method of forming a shaped casting from the inventive composition.

Cette invention concerne un alliage de coulage d'aluminium qui se compose de 4 à 9 % de Si, de 0,1 à 0,7 % de Mg, de 5 % au plus de Zn, de moins de 0,15 % de Fe, de moins de 4 % de Cu, de moins de 0,3 % de Mn, de moins de 0,05 % de B et de moins de 0,15 % de Ti, le reste étant constitué essentiellement d'aluminium. La composition de AlSiMg de cette invention présente de meilleures propriétés mécaniques (force de rupture par traction et résistance à la traction ultime) comparées à celles d'un alliage E357 préparé de la même manière à température ambiante et à haute température. La présente invention concerne également une pièce coulée profilée formée à partir de la composition de cette invention ainsi qu'un procédé de formation d'une pièce coulée profilée à partir de cette composition.

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