Alloys or metallic compositions – Aluminum base – Magnesium containing
Reexamination Certificate
2000-10-17
2001-11-13
Wyszomierski, George (Department: 1742)
Alloys or metallic compositions
Aluminum base
Magnesium containing
C420S553000
Reexamination Certificate
active
06315948
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a weldable, corrosion-resistant, high-magnesium content aluminum-magnesium alloy, which contains a ternary aluminum-scandium-zirconium phase as an essential component. Such an alloy is disclosed in U.S. Pat. No. 5,624,632, for application in aircraft due to its low density, high strength and corrosion resistance. Adding rare earth or rare earth-like elements generates dispersoids in the aluminum-magnesium alloy, which produce a higher strength and corrosion resistance. The aforesaid US patent is silent as regards the weldability of such an alloy.
SUMMARY OF THE INVENTION
An object of this invention is to provide a weldable, corrosion-resistant, high magnesium content aluminum-magnesium alloy, which is at least as good as the known alloy with respect to strength and corrosion resistance and exhibits a high recrystalization threshold and good weldability. This and further objects of the invention are achieved by a weldable, high magnesium-content aluminum-magnesium alloy consisting essentially of 5 to 6% by weight magnesium, 0.05 to 0.15% by weight zirconium, 0.7 to 1.0% by weight manganese, 0.01 to 0.2 by weight titanium, 0.005 to 0.5% by weight cerium, 0.05 to 0.5% by weight of at least one element selected from the group consisting of the scandium group of the Periodic Table, wherein at least scandium is present, the balance being aluminum, and unavoidable contaminants not exceeding 0.2% by weight silicon.
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Filatov Yuri
Lenczowski Blanka
Rauh Rainer
Yelagin Viktor
Zakharov Valeri
Combs-Morillo Janelle
Daimler Chrysler AG
Ladas & Parry
Wyszomierski George
LandOfFree
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