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SEM micrograph of: (A) zirconia-toughened alumina (80% alumina and 20% zirconia) and (B) alumina-toughened zirconia (80% zirconia and 20% alumina) composites. Both polycrystalline composites present a dense microstructure with secondary phases that are homogeneously distributed in the alumina and zirconia matrices, respectively. Moreover, the white arrows indicate microstructural defects originating from ceramic processing.
