Abstract
Abstract Full tetragonal 3 mol.% Y2O3 doped zirconia has been subjected to hydrothermal ageing in water at 131 °C in order to study the change in microstructure just below the surface. The degraded layer was examined by scanning and transmission electron microscopy in a section perpendicular to the surface which was prepared by focus ion beam machining. The existence of microcracks and transformed grains in a thin surface layer of the hydrothermal degraded specimens is shown. Scratch damage in annealed and in thermally degraded specimens is compared.
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