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Atomistic Simulations of Ti Additions to NiAl

Published online by Cambridge University Press:  15 February 2011

Guillermo Bozzolo ,
Ronald D. Noebe ,
Anita Garg ,
John Ferrante  and
Carlos Amador
Guillermo Bozzolo
Affiliation:
Analex Corporation, 3001 Aerospace Parkway, Brook Park, OH, 44142–1003
Ronald D. Noebe
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135.
Anita Garg
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135.
John Ferrante
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135.
Carlos Amador
Affiliation:
Facultad de Química, Universidad Nacional Autónomade México, Ciudad Universitaria, 04510, Distrito Federal, México
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Abstract

The development of more efficient engines and power plants for future supersonic transports depend on the advancement of new high-temperature materials with temperature capabilities exceeding those of Ni-based superalloys. Having theoretical modelling techniques to aid in the design of these alloys would greatly facilitate this development. The present paper discusses a successful attempt to correlate theoretical predictions of alloy properties with experimental confirmation for ternary NiAl-Ti alloys. The B.F.S. (Bozzolo- Ferrante-Smith) method for alloys is used to predict the solubility limit and site preference energies for Ti additions of 1 to 25 at. % to NiAl. The results show the solubility limit to be around 5 % Ti, above which the formation of Heusler precipitates is favored. These results were confirmed by transmission electron microscopy performed on a series of NiAl-Ti alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 443
Copyright
Copyright © Materials Research Society 1997

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References

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