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atomistic simulations of ti additions to nialThe development of more efficient engines and power plants for future supersonic transports depends 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.
Document ID
19980018499
Document Type
Technical Memorandum (TM)
Authors
Bozzolo, Guillermo
(Analex Corp. Brook Park, OH United States)
Noebe, Ronald D.
(NASA Lewis Research Center Cleveland, OH United States)
Garg, Anita
(NASA Lewis Research Center Cleveland, OH United States)
Ferrante, John
(NASA Lewis Research Center Cleveland, OH United States)
Amador, Carlos
(Ciudad Univ. Mexico City, Mexico)
Date Acquired
September 6, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Materials Research Society Symposium Proceedings
Volume: 460
Subject Category
Metallic Materials
Report/Patent Number
NASA/TM-97-207384
NAS 1.15:207384
Distribution Limits
Public
Copyright
Public Use Permitted.

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NameType 19980018499.pdf STI