Metal treatment – Compositions – Heat treating
Patent
1986-09-10
1988-02-02
Rutledge, L. Dewayne
Metal treatment
Compositions
Heat treating
148 115P, 148 127A, 148417, 420902, 419 41, 419 44, C22F 1053, C22C 2110
Patent
active
047227540
ABSTRACT:
Superplastically formable aluminum alloys and composite materials are prepared from rapidly solidified, coarse aluminum powder of a precipitation hardenable alloy, processed to have a low oxide and contaminant content. The powder is mixed, together with reinforcement in the case of the composite material, and then consolidated and extruded at a high extrusion ratio to promote microstructural uniformity and to break up the surface oxide present on the particles. The extrusion is then thermomechanically processed to impart a recrystallized fine-grain aluminum microstructure which is suitable for use in superplastic forming. The unreinforced powder alloy exhibits uniform elongations of over 800 percent at a strain rate of 2.times.10.sup.-4 per second, and a composite having 0.10 volume fraction silicon carbide reinforcement exhibits uniform elongations of over 450 percent at the same strain rate.
REFERENCES:
patent: 3544392 (1970-12-01), Lyle et al.
patent: 3775101 (1973-11-01), Freche et al.
patent: 4486244 (1984-12-01), Ward et al.
patent: 4537167 (1985-08-01), Eudier et al.
Ghosh Amit K.
Mahoney Murray W.
Garmong Gregory O.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
Rutledge L. Dewayne
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