Alloys or metallic compositions – Aluminum base – Magnesium containing
Reexamination Certificate
2000-06-14
2001-07-10
Wyszomierski, George (Department: 1742)
Alloys or metallic compositions
Aluminum base
Magnesium containing
C420S543000
Reexamination Certificate
active
06258318
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 aerospace construction 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 U.S. 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 3 to 5% by weight magnesium, 0.05 to 0.15% by weight zirconium, 0.05 to 0.12% by weight manganese, 0.01 to 0.2% by weight titanium, 0.05 to 0.5% by weight of at least one element selected from the scandium group of the Periodic Table, wherein scandium is present as a mandatory element optionally with terbium and/or 0.05% to 0.35% by weight of one or more elements in the lanthanide series, the balance being aluminum and unavoidable contaminants not exceeding 0.2% by weight silicon.
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Lenczowski Blanka
Rauh Rainer
Tempus Gerhard
Wieser Dietrich
Combs-Morillo Janelle
EADS Deutschland GmbH
Ladas & Parry
Wyszomierski George
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