Abstract
In the present study, the room-temperature mechanical properties of Al 2O 3-NiAl composites containing 0 to 100 vol.% NiAl are determined. The composites are prepared by attrition milling Al 2O 3 and NiAl powders together followed by hot-pressing in vacuum. The Al 2O 3 and NiAl grains in the composites constrain each other's growth. Since the hardness of NiAl is lower than that of Al 2O 3, the hardness of the composites decreases with the increase of NiAl content. The strength and toughness of the Al 2O 3-NiAl composites are higher than the values predicted by the rule of mixtures. The strengthening effect is mainly contributed by the microstructural refinement. Because the Al 2O 3/NiAl interface is weak, cracks propagate mainly along the interfaces. The fracture toughness is thus enhanced.
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