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FGMs by Sedimentation

Published online by Cambridge University Press:  10 February 2011

Y. He
Affiliation:
Ohio State University, Columbus, OH 43210, lannuttj@KCGLl.eng.ohio-state.edu
V. Subramanian
Affiliation:
Ohio State University, Columbus, OH 43210, lannuttj@KCGLl.eng.ohio-state.edu
J. Lannutti
Affiliation:
Ohio State University, Columbus, OH 43210, lannuttj@KCGLl.eng.ohio-state.edu
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Abstract

Simple sedimentation in organic solvents followed by hot-pressing is used to produce alumina-NiAI functionally graded materials (FGMs). Varying degrees of agglomeration influenced the phase arrangement in the mixed layer(s) producing microstructural variation. We discovered a pronounced structural dependence on NiAl stoichiometry. Slight variations in Al content are known to influence Tdb and these apparently lead to large increases in residual stress. Zirconia - NiA1 FGMs were better able to accorrunodate these levels of residual stress possibly due to accommodation by enhanced tetragonal phase retention. However, these FGMs undergo transformation of the tetragonal phase to the monoclinic fonn, starting from the surface. Finally, variable microstructures result in detectable changes in the stress-strain behavior of alumina-NiAl FGMs.

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