Patent ID: 6261391
Filing Date: 2001-07-17
Classification: C22C,C22F

Abstract:
A method for producing an aluminum alloy plate for super plastic 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 %, 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 a final stage to at least 50%; andsubjecting the rolled plate of a 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 about 140.degree. C. at a temperature-elevating speed of 10 C./min or less, maintaining the rolled plate at the elevated temperature for 5 to 12 hours, and thereafter cooling the rolled plate at a cooling speed of 10.degree. C./min or less.