The mechanical properties of the Al 2 O 3 ‐NiAl system are investigated in the present study. Specimens containing 0 to 100 vol% NiAl in Al 2 O 3 were prepared by hot pressing. Both the strength and toughness of the Al 2 O 3 ‐NiAl composites are higher than the values predicted by the rule of mixtures. The grain growth of Al 2 O 3 and NiAl in the composites is constrained by each component. The increase in strength is thus partly attributed to microstructural refinement. The toughness enhancement is contributed by a combination of crack deflection and crack bridging.
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Tuan et al. (1999) studied this question.
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