Hertzian contact damage in magnesia‐partially‐stabilized zirconia is examined. Ceramographic techniques and acoustic emission reveal the damage patterns to be fundamentally different in the as‐fired, peak‐aged, and over‐aged states. Indentation stress‐strain curves show that the plasticity component of the contact deformation increases monotonically with aging time. Whereas the tetragonal‐monoclinic transformation plays an important role in the peak‐aged material, alternative deformation processes dominate in the other states: microcracking in as‐fired, and monoclinic twinning in over‐aged.
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Pajares et al. (1995) studied this question.
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