Strain Localization during Diametral Compression of ZrO2(Y2O3) Ceramics

Resumo

Deformation behavior of ZrO₂−Y₂O₃ ceramics under conditions of diametral compression has been studied by method of digital image correlation. Spatiotemporal patterns of strain localization along the axis of a deformed sample (ε_xx(x)) and across this axis (ε_yy(y)) were obtained. It is established that the ε_xx and ε_yy deformations accumulated during the diametral compression test are inhomogeneously distributed over the sample. This is manifested by variation of the microstructure characteristics such as the size of the coherently diffracting domains of a tetragonal phase and microstresses and leads to the tetragonal–monoclinic phase transformation. This pattern of strain localization is correlated with the observed inhomogeneity of microstresses arising in the material volume.