Indentation Studies on Y2O2‐Stabilized ZrO2: I, Development of Indentation‐Induced Cracks

The development of Vickers indent-induced tracks with increasing indent load has been studied in two Y2O3-stabilizel ZrO2 ceramics. Such cracks form as radial or Palmqvist cracks at low loads, assume “kidney” shapes at intermediate loads, and finally form median (half-penny) cracks at high loads. The plastic zone directly beneath the indent is uncracked; a significant portion of the plasticity induced by indentation occurs by martensitic transformation.

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