Composites of Al 2 O 3 (A) and cubic ZrO 2 (Z) (8 mol% Y 2 O 3 ) (with c ‐ZrO 2 volume fractions ranging from O to 1) were fabricated by pressureless sintering of mechanically mixed powders. The microstructures of the AZ composites were duplex, with the grains of both phases exhibiting similar size. Room‐temperature mechanical properties including Young's modulus (determined from elastic wave velocity measurements), strength and toughness (by indentation‐strength‐in‐bending), and Vickers microhardness were evaluated for the full range of compositions. All properties exhibited a linear decrease with increasing c ‐ZrO 2 content, and no R ‐curve behavior was seen in any of the composite compositions. Fracture morphology, observed from cracks emanating from microhardness indentations, changed from essentially intergranular for the tougher Al 2 O 3 to transgranular for c ‐ZrO 2 , with AZ composites exhibiting mixed morphology.
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French et al. (1992) studied this question.
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