Appeal No. 1997-2958 4
Application No. 08/401,719
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;
wherein the method comprises the steps of:
casting the aluminum alloy;
rolling the cast alloy to a final plate thickness, said rolling step including setting a
cold rolling rate at final stage to at least 50%; and
subjecting the rolled plate of the final plate thickness to final annealing, wherein the
rolled plate having the final plate thickness is heated to an elevated temperature within a
range of 70 to 150°C at a temperature-elevating speed of 10°C/min or less, maintaining the
rolled plate at the elevated temperature for 0.5 to 12 hours, and thereafter cooling the
rolled plate at a cooling speed of 10°C/min or less. [Emphasis ours.]
4. 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 %;, [typo]
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;
wherein the method comprises the steps of:
casting the aluminum alloy;
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