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

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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.

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Authors and Affiliations

  1. Department of Applied Mechanics and Engineering Sciences and Materials Science Program, University of California at San Diego, La Jolla, California, 92093-0411, USA

    John Freim & J. McKittrick

  2. Lawrence Livermore National Laboratory, University of California, Institute of Geophysics and Planetary Physics and H Division, Livermore, California, 94550, USA

    W. J. Nellis

  3. Los Alamos National Laboratory, Materials Science and Technology Division, MST-4, Los Alamos, New Mexico, 87545, USA

    J. D. Katz

Authors
  1. John Freim
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  2. J. McKittrick
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  3. W. J. Nellis
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  4. J. D. Katz
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Freim, J., McKittrick, J., Nellis, W.J. et al. Development of novel microstructures in zirconia-toughened alumina using rapid solidification and shock compaction. Journal of Materials Research 11, 110–119 (1996). https://doi.org/10.1557/JMR.1996.0014

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  • DOI: https://doi.org/10.1557/JMR.1996.0014

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