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Phase instability in ZrO2–NiAl functionally graded materials

Published online by Cambridge University Press:  31 January 2011

Yi-Rong He
Affiliation:
Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210
Vidya Subramanian
Affiliation:
Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210
John J. Lannutti
Affiliation:
Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210
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Abstract

Sedimentation in organic solvents was followed by hot-pressing to produce 2 mole % yttria stabilized zirconia-NiAl functionally graded materials (FGM's). These FGM's were better able to accommodate high levels of residual stress than alumina-NiAl FGM's; this is possibly due to enhanced tetragonal phase retention. However, we found that the zirconia layer in these FGM's subsequently experiences room temperature transformation of t-ZrO2 to m-ZrO2.

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Copyright
Copyright © Materials Research Society 1997

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