Abstract
Brittle solids can be toughened by introducing ductile inclusions. In the present study, Al 2 O 3 Ni composites are prepared by reducing Al 2O 3 and NiO powder mixtures or by reducing Al 2 O 3 NiAl 2 O 4 compacts in hydrogen. The flexural strength and fracture toughness of the Al 2 O 3 Ni composites are determined. Due to the thermal expansion mismatch between alumina and nickel, a circumferential crack is formed at the interface as the nickel inclusion is larger than 2 μm. The toughness of the composites is enhanced by a crack bridging mechanism or by microcrack toughening. However, the strength of the Al 2 O 3 Ni composites is decreased significantly as the microcracks are formed.
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