Abstract
The anisotropic deformation formed in Y-PSZ crystals by Vickers indentation was discussed on the base of an analysis of the surface texture. Needle-like texture appears around the indentation and is related to occurrence of the transformed monoclinic phase. The appearance region of this texture differs from one another in the crystal direction of ‹010› and ‹011›, and changes with angle between the crystal orientation and the direction of pyramidal indentor. This morphological change on the surface results mainly from the crystal anisotropy of the slip systems and the orientation of the pyramidal form of the indentation. Observation of fracture surfaces indicated that the needle-like texture appeared in the slip plain less frequently than in other places. Polarized micrographs showed that the strain region around the indentation below the surface was the same region where the needle-like texture was observed.
