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Nickel aluminide alloy suitable for structural applications

United States Patent

5,725,691
March 10, 1998
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Alloys for use in structural applications based upon NiAl to which are added selected elements to enhance room temperature ductility and high temperature strength. Specifically, small additions of molybdenum produce a beneficial alloy, while further additions of boron, carbon, iron, niobium, tantalum, zirconium and hafnium further improve performance of alloys at both room temperature and high temperatures. A preferred alloy system composition is Ni--(49.1.+-.0.8%)Al--(1.0.+-.0.8%)Mo--(0.7.+-.0.5%)Nb/Ta/Zr/Hf--(nearly zero to 0.03%)B/C, where the % is at. % in each of the concentrations. All alloys demonstrated good oxidation resistance at the elevated temperatures. The alloys can be fabricated into components using conventional techniques.
Liu; Chain T. (Oak Ridge, TN)
Lockheed Martin Energy Systems, Inc. (Oak Ridge, TN)
08/ 609,010
February 29, 1996
DESCRIPTION This invention was made with Government support under contract DE-AC05-840R21400 awarded by the U.S. Department of Energy, Advanced Industrial Concepts Materials Program, to Martin Marietta Energy Systems, Inc., and the Government has certain rights in this invention.