ORIENTED EUTECTIC MICROSTRUCTURES IN THE SYSTEM Al2O3/ZrO2
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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Oriented eutectic microstructures have been produced in the system Al2O3ZrO2 using a Bridgman-type crystal-growing furnace. Ingots consisted of elongated columnar grains or colonies. Inside the colonies a rod-type eutectic microstructure consisting of rods of ZrO2 surrounded by an Al2O3 matrix was observed. The eutectic point was re-established at 63 mo1 Al2O337.0 mo1 ZrO2 and 1870C. Al203 is the first phase to nucleate when eutectic growth occurs.
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