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Development of novel microstructures in zirconia-toughened alumina using rapid solidification and shock compaction

Published online by Cambridge University Press:  31 January 2011

John Freim ,
J. McKittrick ,
W. J. Nellis  and
J. D. Katz
John Freim
Affiliation:
Department of Applied Mechanics and Engineering Sciences and Materials Science Program, University of California at San Diego, La Jolla, California 92093–0411
J. McKittrick
Affiliation:
Department of Applied Mechanics and Engineering Sciences and Materials Science Program, University of California at San Diego, La Jolla, California 92093–0411
W. J. Nellis
Affiliation:
Lawrence Livermore National Laboratory, University of California, Institute of Geophysics and Planetary Physics and H Division, Livermore, California 94550
J. D. Katz
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, MST-4, Los Alamos, New Mexico 87545
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Abstract

A rapidly solidified alumina-zirconia eutectic material containing nanocrystalline t-ZrO2 has been synthesized. When heated, the microstructure contained a mixture of t-ZrO2 and m-ZrO2, each of which can facilitate toughening of the composite. Dynamic shock compaction was used to accelerate densification of the material, producing crack-free specimens with high green densities. After sintering to densities measuring ∼95% of theoretical, the shock-compacted specimens fabricated with unstabilized alumina-zirconia were extensively microcracked due to an overabundance of the m-ZrO2 phase. Experiments employing Y2O3 as a chemical stabilizer have shown that the extent of the phase transformation can be controlled, and the microstructure that developed in the stabilized material contained an acceptable level of the microcrack generating m-ZrO2 phase.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 110 - 119
Copyright
Copyright © Materials Research Society 1996

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