Implications of Transformation Plasticity in ZrO2‐Containing Ceramics: I, Shear and Dilatation Effects

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Abstract
Transformation plasticity in ZrO2‐containing ceramics generally exhibits shear and dilatation effects of comparable magnitude. The coupling between external stresses and crystallographic strains assists the tetragonal‐monoclinic transformation, which, via shear localization, gives rise to macroscopic shear and dilatant deformation. Application of a yield criterion based on both shear and dilatation effects correctly correlates deformation data from tension, compression, bending, and indentation, and further delineates a crack‐tip process zone comparable to the one observed experimentally. Similar shear and dilatation effects in microcracking due to transformation plasticity are explored. These findings suggest that the strength of the ultimate transformation‐toughened structural ceramics should be yield limited and sensitive to the stress state. Strategies for fracture control are recommended.

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