Grain refinement and superplastic forming of an aluminum base al

Details Grain refinement and superplastic forming of an aluminum base al Grain refinement and superplastic forming of an aluminum base al

1987-08-17

1988-09-13

Rutledge, L. Dewayne

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

148 115A, 148 115P, 148 127A, 148417, 419 29, 419 48, 419 54, 420902, B22F 314

Patent

active

047708484

ABSTRACT:
A rapidly-solidified aluminum alloy powder having a nominal composition of 7% Zn, 2.5% Mg, 2% Cu, 0.3% Zr, and 0.3% Cr is used to make a high forming-rate, superplastic, high-strength aluminum alloy. The powder is outgassed, consolidated, and extruded, thereby developing a wide range of particle size distribution of dispersoids in the process, containing respectively zirconium and chromium dispersoids, as well as age hardening precipitates. The consolidated powder is then rolled to 85% reduction to provide a sheet material which is superplastically formed at a temperature in the range of 450.degree. C. to 490.degree. C. and at a rate between 5.times.10.sup.-3 to 5.times.10.sup.-2 per second.

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