Abstract
Low-frequency internal friction was studied at a torsional-vibration frequency of 24 Hz in polycrystalline samples of ZrO2 + 4 mol % Y2O3 ceramics. The samples were prepared using cold isostatic pressing of a powder followed by sintering in air, hot isostatic pressing of the sample in an argon atmosphere, subsequent mechanical deformation of the surface, and further calcination in air. The x-ray phase analysis method is used to study the variation in the phase composition after mechanical deformation of the sample surface followed by calcination in air. The internal friction was measured in the temperature range 280–380 K on a sample subjected to calcination in air. At 315 K, an internal-friction peak was revealed, which is explained by stress relaxation at the boundaries of the T’-phase domains.
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