Preformable aluminum-alloy rolled sheet adapted for superplastic

Details Preformable aluminum-alloy rolled sheet adapted for superplastic Preformable aluminum-alloy rolled sheet adapted for superplastic

1994-10-24

1996-07-30

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148552, 148688, 148692, 148696, 148440, 148564, 420542, 420543, 420545, 420547, 420553, 420902, C22F 104

Patent

active

055407919

ABSTRACT:
An aluminum-alloy rolled sheet is cold preformed and then superplastically formed by: providing a composition which consists of from 2.0 to 8.0% of Mg, from 0.0001 to 0.01% of Be, and at least one element selected from the group consisting of from 0.3 to 2.5% of Mn, from 0.1 to 0.5% of Cr, from 0.1 to 0.5% of Zr, and from 0.1 to 0.5% of V, less than 0.2% of Fe as impurities, as well as aluminum and unavoidable impurities in balance; providing an unrecrystallized structure formed by annealing at a temperature of from 150.degree. to 240.degree. C. for 0.5 to 12 hours or at a temperature of from 250.degree. to 340.degree. C. for 0 to 5 minutes; providing draft of final cold-rolling amounting to 50% or more; and, providing 7% or more of elongation at normal temperature.

REFERENCES:
patent: 5181969 (1993-01-01), Komatsubara et al.

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