Method for forging rapidly solidified magnesium base metal alloy

Details Method for forging rapidly solidified magnesium base metal alloy Method for forging rapidly solidified magnesium base metal alloy

1990-06-15

1991-12-10

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 23, 419 28, 419 38, 419 54, 419 60, B22F 900

Patent

active

050714740

ABSTRACT:
A magnesium base metal component is forged from a billet by subjecting the billet to a forging process using multiple steps in a closed-die or an open-die forging and a forging temperature ranging from 200.degree. C. to 300.degree. C. The billet is compacted from a rapidly solidified magnesium based alloy defined by 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" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "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. The alloy has a uniform microstructure comprised of a fine grain size ranging from 0.2-1.0 .mu.m together with precipitates of magnesium and aluminum containing intermetallic phases of a size less than 0.1 .mu.m. Upon being forged, the component exhibits, in combination, excellent mechanical strength and ductility, making it especially suited for aerospace structural applications.

REFERENCES:
patent: 4853039 (1989-10-01), Das et al.
patent: 4857109 (1989-08-01), Das et al.
patent: 4938809 (1990-07-01), Das et al.

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