Abstract
Herein, the microstructure in 3 mol% Y2O3-stabilized tetragonal ZrO2 polycrystals (Y-TZP) at the early stage of the low-temperature degradation (LTD) was analyzed using scanning transmission electron microscopy (STEM)-nanoprobe and energy-dispersive spectroscopy (EDS) techniques. The effects of the grain size and Y3+ concentration within the grain interiors on the LTD behavior were experimentally investigated using Y-TZP bodies prepared through the isothermal sintering process. The tetragonal-to-monoclinic (T → M) phase transformation, which is the LTD origin, was accelerated by the Y3+ concentration decrease within the grain interiors, and was insensitive to the grain size. The STEM-nanoprobe EDS analysis revealed that the T → M phase transformation preferentially occurred from the tetragonal phase with low Y3+ concentration.
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