Superplastic forming consolidated rapidly solidified, magnestum

Details Superplastic forming consolidated rapidly solidified, magnestum Superplastic forming consolidated rapidly solidified, magnestum

1988-05-23

1990-07-03

McDowell, Robert

Metal treatment

Stock

Age or precipitation hardened or strengthened

75249, 420405, 420407, 420408, 420409, 420410, 420411, 420412, 420902, C22C 2302

Patent

active

049388096

ABSTRACT:
A complex part composed of rapidly solidified magnesium base metal alloy is produced by superplastic forming at a temperature ranging from 160.degree. C. to 275.degree. C. and at a rate ranging from 0.00021 m/sec. to 0.00001 m/sec., to improve the formability thereof and allow forming to be conducted at lower temperatures. The rapidly solidified magnesium based alloy has a composition consisting essentially of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium and yttrium, "a" range from 0 to about 15 atom percent, "b" ranges from 0 to about 4 atom percent and "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. Such an alloy contains fine grain size and finely dispersed magnesium-, aluminum- rare earth intermetallic phases. When formed, the part exhibits good corrosion resistance together with high ultimate tensile strength and good at room ductility temperature, which properties are, in combination, far superior to those of conventional magnesium alloys. The part is suitable for application as a structural member in helicopters, missiles and air frames where good corrosion resistance in combination with high strength and ductility is important.

REFERENCES:
patent: 2659133 (1953-11-01), Leontis et al.
"Rare Metals Improve Magnesium Alloys", The Iron Age, Jul. 22, 1948, p. 83.

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