Abstract
ZrO2 polycrystals, partially stabilized by 2 to 7 mol% Y2O3, were arc-melted and rapidly quenched using an arc-imaging furnace with a hammer-anvil unit. Some of the specimens were further annealed at 1700° C for 3 h in air. The phases and the microstructures of these ZrO2-Y2O3 polycrystals were examined through X-ray diffraction and transmission electron microscopy. Special emphasis was placed upon the examination of the microstructure of the metastable tetragonal phase (t′ phase) which was formed by a diffusionless transformation of the high-temperature cubic phase. It was found that the t′ phase exhibits a twinned and mosaic structure made of alternating layers of twin-related variants. A comparison of the present experimental results with other related works has also been made.
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