Dislocation climb controlled deformation of Y2O3-doped cubic ZrO2 single crystals

Abstract

Abstract Constant strain rate tests have been performed on cubic ZrO 2 single crystals stabilized with 9·4 mol% Y 2 O 3 in an argon atmosphere at temperatures up to 1750°C. Crystals were oriented along the 〈112〉 direction for easy {001}〈110〉 slip. Mechanical data have been correlated with transmission electron microscopy observations in order to characterize the strain rate-controlling mechanism. At temperatures above 1500°C, a recovery mechanism by dislocation climb has been obtained with an activation energy of about 510 kJ/mol, corresponding to the cation diffusion.