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

B. T. Lee, K. Hiraga, Daisuke Shindo, A. Nishiyama

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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.

Original languageEnglish
Pages (from-to)959-964
Number of pages6
JournalJournal of Materials Science
Issue number4
Publication statusPublished - 1994 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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