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Fabrication and properties of functionally graded NiAl/Al2O3 composites

Published online by Cambridge University Press:  31 January 2011

D.P. Miller ,
J.J. Lannutti  and
R.D. Noebe
D.P. Miller
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210-1179
J.J. Lannutti
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210-1179
R.D. Noebe
Affiliation:
NASA-Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135-3191
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Abstract

A modified sedimentation process was used in the production of a functionally gradient material (FGM), NiAl/Al2O3. A simple finite element model was used to guide our design and fabrication efforts by estimating residual stress states as a function of composite structure. This approach could lead to tailored designs that enhance or avoid specific residual stress states. Thermal cycling tests were factored into the model to predict time dependent or steady-state internal temperature and stress profiles. Four-point bend tests were conducted to establish the mechanical load-displacement behavior of a single interlayer FGM at room temperature, 800 and 1000 K. Room temperature bend strength of the FGM was 3–4 times that of the base NiAl. At elevated temperatures, composite fracture occurred in a gradual, noncatastrophic mode involving NiAl retardation of a succession of cracks originating in the alumina face.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 8 , August 1993 , pp. 2004 - 2013
Copyright
Copyright © Materials Research Society 1993

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