The temperature dependence of hardness and microcracking in single‐crystal 9.5‐mol%‐Y 2 O 3 ‐fully‐stabilized cubic‐ZrO 2 was studied as a function of orientation. Crack lengths increased with increased temperature up to 500°C; above 800°C, no cracks were found, indicating an indentation brittle‐to‐ductile transition of ∼800°C. The temperature dependence of hardness was reduced around 500°C. Etching studies to delineate the plastic zone around and below indents identified the operative slip systems. The role of dislocations and their interactions within the plastic zone on the hardness and indentation fracture behavior of cubic‐ZrO 2 are discussed.
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Morscher et al. (1991) studied this question.
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