Abstract
Deformation of Ce-TZP at high temperature was studied. The stress exponents n=1 were obtained for grain sizes from 1.5 to 4.1 μm, showing the deformation is not superplastic but is diffusional flow. Because the diffusion of anion is much faster than that of cation, the latter is rate controlling. Apparent grain size dependence of deformation (p∼2) suggests that the deformation appears to be controlled by cation lattice diffusion. However, calculated diffusion coefficients were found to be in agreement with the reported values for cation grain boundary diffusion. The apparent disagreement is explained probably by the existence of sub-boundaries in the grains.
