Ut-battelle, Inc.

Martin Marietta Energy Systems, Inc.

Peter F Tortorelli

Chain T Liu

Michael P Brady

Stan A David

Claudette G McKamey

Jiahong Zhu

Dual phase alloys of chromium containing 2 to 11 atomic percent tantalum with minor amounts of Mo, Cr, Ti, Y, La, Cr, Si and Ge are disclosed. These alloys contain two phases including Laves phase and Cr-rich solid solution in either eutectic structures or dispersed Laves phase particles in the Cr-rich solid solution matrix. The alloys have superior mechanical properties at high temperature and good oxidation resistance when heated to above 1000&deg; C. in air.

Dual-phase Cr-Ta alloys for structural applications

The specification discloses a corrosion-resistant intermetallic alloy comprising, in atomic percent, an FeAl iron aluminide containing from about 30 to about 40% aluminum alloyed with from about 0.01 to 0.4% zirconium and from 0.01 to about 0.8% boron. The alloy exhibits considerably improved room temperature ductility for enhanced usefulness in structural applications. The high temperature strength and fabricability is improved by alloying with molybdenum, carbon, chromium and vanadium.

Corrosion resistant iron aluminides exhibiting improved mechanical

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Knoxville, TN, United States of America

Peter F Tortorelli