Abstract
A pressure-induced directional crystallization process is described to convert equiaxially-grained cubic Y2O3 into columnar-grained monoclinic Y2O3. The conversion to the columnar-grained structure initiates at the sample surface, propagates into the sample interior and eventually encompasses the entire sample volume. Optimal processing conditions are about 3.0 GPa at 1000 °C. It is proposed that the phase transformation from cubic Y2O3 to the higher density monoclinic Y2O3 provides the driving force for columnar grain growth.
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