Aluminum alloy extrusions having a substantially...

C - Chemistry – Metallurgy – 22 – F

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C22F 1/057 (2006.01) C22C 1/00 (2006.01) C22C 21/16 (2006.01)

Patent

CA 2440787

A substantially unrecrystallized extrusion comprising about 3.6 to about 4.2 wt.% copper, about 1.0 to about 1.6 wt.% magnesium, about 0.3 to about 0.8 wt.% manganese, about 0.05 to about 0.25% zirconium, the balance substantially aluminum, incidental elements and impurities. The extrusion has a longitudinal yield strength of at least about 50 ksi and a longitudinal tensile ultimate strength of at least about 70 ksi. On a preferred basis, the extrusions of this invention include very low levels of both iron and silicon, typically on the order of less than 0.1 wt.% each, and more preferably about 0.05 wt.% or less iron and about 0.03 wt.% or less silicon.

L'invention concerne une extrusion sensiblement non recristallisée comprenant environ 3,6 à environ 4,2 % en poids de cuivre, environ 1,0 à environ 1,6 % en poids de magnésium, environ 0,3 à environ 0,8 % en poids de manganèse, environ 0,05 à environ 0,25 % de zirconium, le reste étant sensiblement de l'aluminium, des éléments aléatoires et des impuretés. L'extrusion présente une limite d'élasticité longitudinale d'au moins environ 50 ksi et une résistance limite à la traction longitudinale d'au moins environ 70 ksi. Dans un mode de réalisation préféré, les extrusions de cette invention comprennent des niveaux très faibles à la fois de fer et de silicium, typiquement de l'ordre de moins de 0,1 % en poids chacun, de préférence d'environ 0,05 % en poids ou moins de fer et environ 0,03 % ou moins de silicium.

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