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NiAl-Base Composite Containing High Volume Fraction of Aln Particulate for Advanced Engines

Published online by Cambridge University Press:  22 February 2011

Mohan G. Hebsur ,
J. D. Whittenberger ,
C. E. Lowell  and
A. Garg
Mohan G. Hebsur
Affiliation:
NYMA Inc., LeRC Group, Brookpark, OH 44142
J. D. Whittenberger
Affiliation:
NASA-Lewis Research Center, Cleveland, OH 44135
C. E. Lowell
Affiliation:
NASA-Lewis Research Center, Cleveland, OH 44135
A. Garg
Affiliation:
NASA-Lewis Research Center, Cleveland, OH 44135
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Abstract

Cryomilling of prealloyed NiAl containing 53 at. % AJ was carried out to achieve high nitrogen levels. The consolidation of cryomilled powder by extrusion or hot pressing/hot isostatic pressing resulted in a fully dense NiAl-base composite containing 30 vol. % of inhomogeneously distributed, nanosized AlN particulate. The NiAl-30AlN composite exhibited the highest compression yield strengths at all temperatures between 300 and 1300 K as compared with other compositions of NiAl-AlN composite. The NiAl-30AlN specimens tested under compressive creep loading between 1300 and 1500 K also exhibited the highest creep resistance with very little surface oxidation indicating also their superior elevated temperature oxidation resistance. In the high stress exponent regime, the strength is proportional to the square root of the AlN content and in the low stress exponent regime, the influence of AlN content on strength appears to be less dramatic. The specific creep strength of this material at 1300 K is superior to a first generation Ni-base single crystal superalloy. The improvements in elevated temperature creep strength and oxidation resistance have been achieved without sacrificing the room temperature fracture toughness of the NiAl-base material. Based on its attractive combination of properties, the NiAl-30AlN composite is a potential candidate for advanced engine applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 579
Copyright
Copyright © Materials Research Society 1995

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References

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