High-temperature plastic deformation of Y₂O₃-stabilized ZrO₂ single crystals. I. The origin of the yield drop and associated glide polygonization

Abstract

Plastic deformation in Y₂O₃-stabilized ZrO₂ single crystals, oriented for single glide on the {001}<110> system, has been studied at 1400[ddot]C. Stress-strain curves exhibit a yield drop which is due to dislocation multiplication but involves activation of secondary {111}<110> slip systems. X-ray topography revealed that dislocation walls perpendicular to the active slip planes formed at small strains and persisted throughout the deformation.