Appeal No. 1997-2958 3
Application No. 08/401,719
Mg ranging from 2.0 to 8.0 weight %;
Be ranging from 0.0001 to 0.01 weight %;
at least one of
Mn ranging from 0.3 to 2.5 weight %,
Cr ranging from 0.1 to 0.5 weight %,
Zr ranging from 0.1 to 0.5 weight % and
V ranging from 0.1 to 0.5 weight %;
Fe and Si each ranging from 0.0 to 0.2 weight %;
Na ranging from 0 to 3 ppm;
Ca ranging from 0 to 5 ppm;
and a remainder of Al and inevitable impurities;
the aluminum alloy plate being formed by casting an aluminum alloy of the
above composition, rolling the cast alloy to a final plate thickness in which a cold rolling rate
at a final stage of the rolling is at least 50%, and final annealing the rolled plate of the final
plate thickness at an elevated temperature in a range of 70-250°C so that the plate has a
non-recrystallized crystal structure.
Independent process claims 2 and 4 are each directed to forming the plate by casting, rolling
and final annealing. The annealing step is conducted either batchwise or continuously. Claim 2 sets
forth the temperature and time parameters of the batch annealing operation. Claim 4 sets forth the
temperature and time parameters of the continuous annealing operation.
2. A method for producing an aluminum alloy plate for superplastic molding capable of cold pre-
molding from an aluminum alloy containing
Mg ranging from 2.0 to 8.0 weight %;
Be ranging from 0.0001 to 0.01 weight %;
at least one of
Mn ranging from 0.3 to 2.5 weight %;
Cr ranging from 0.1 to 0.5 weight %,
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