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Microstructure of pressureless-sintered Al2O3-24 vol% ZrO2 composite studied by high-resolution electron microscopy

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Abstract

The microstructure of an Al2O3-24 vol% ZrO2 composite prepared by pressureless-sintering was investigated by high-resolution electron microscopy. The composite was formed of homogeneously dispersed ZrO2 and Al2O3 grains with average sizes of 0.3 and 0.5 μm, respectively. Most ZrO2 grains had a monoclinic structure, but a few ZrO2 embedded in Al2O3 grains were a tetragonal structure. At interfaces between ZrO2 with a lamella-type twin structure and Al2O3, microcracks were observed, in addition to strain fields in the Al2O3 matrix. Complex twin structures accompanied by dislocations were observed in ZrO2 with a spherical shape. In in situ observations with electron-beam heating, it was found that a crack propagated along an Al2O3/ZrO2 interface and stopped at the place where a tetragonal ZrO2 had undergone a structural change to monoclinic ZrO2.

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Authors and Affiliations

  1. Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, 980, Sendai, Japan

    B. T. Lee, K. Hiraga & D. Shindo

  2. Institute for Advanced Materials Processing, Tohoku University, Katahira, Aoba-ku, 980, Sendai, Japan

    D. Shindo

  3. Central Research Institute, Mitsubishi Material Co., 1-297 Omiya, 330, Saitama, Japan

    A. Nishiyama

Authors
  1. B. T. Lee
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  2. K. Hiraga
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  3. D. Shindo
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  4. A. Nishiyama
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Lee, B.T., Hiraga, K., Shindo, D. et al. Microstructure of pressureless-sintered Al2O3-24 vol% ZrO2 composite studied by high-resolution electron microscopy. JOURNAL OF MATERIALS SCIENCE 29, 959–964 (1994). https://doi.org/10.1007/BF00351417

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  • DOI: https://doi.org/10.1007/BF00351417

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