Alliedsignal Inc.

Advanced Materials and Design Corp.

Nack J Kim

Gareth Thomas

Ramamoorthy Ramesh

Eui W Lee

A rapidly solidified aluminum base lithium containing alloy is subjected to at least one overaging treatment and a plurality of rolling passes. Upon completion of the process, the alloy is comprised of grains having an ultrafine grain size. A predominant number of the grains have grain boundaries pinned by the precipitation of Al.sub.3 Zr phase. The alloy has an elongation greater than 500% at temperature above about 500.degree. C. and a strain rate above about 4.times.10.sup.-2 /s.

Rapidly solidified superplastic aluminum-lithium alloys and process for

A high-strength, tough alloy steel is formed by heating an alloy steel comprising iron, 0.1-0.4 weight % carbon, 1-3 weight % manganese and 1-13 weight % chromium and optionally containing microalloying amounts of other metals to about 1150.degree. C. to form a stable homogeneous austenite phase, control rolling the steel at about 900.degree. C.-1100.degree. C., followed by rapid cooling to 950.degree. C. and again rolling at that temperature and then quenching the thusly rolled steel in liquid or by air cooling. Tempering at temperatures up to about 300.degree. C. may be effected to further increase the toughness of the steel.

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Florham Park, NJ, United States of America

Nack J Kim