Journal of Materials Science

, Volume 29, Issue 4, pp 959–964 | Cite as

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

  • B. T. Lee
  • K. Hiraga
  • D. Shindo
  • A. Nishiyama


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.


Polymer Microstructure Microscopy Electron Microscopy Al2O3 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • B. T. Lee
    • 1
  • K. Hiraga
    • 1
  • D. Shindo
    • 1
    • 2
  • A. Nishiyama
    • 3
  1. 1.Institute for Materials ResearchTohoku UniversitySendaiJapan
  2. 2.Institute for Advanced Materials ProcessingTohoku UniversitySendaiJapan
  3. 3.Central Research InstituteMitsubishi Material Co.SaitamaJapan

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