Martensitic transformation behavior was studied for zirconia containing 4% ～ 10% CeO2 (in mole fraction) by using a dilatometric method. The M, (Martensite start temperature ) decreased near linearly with increasing CeO2. Different transformation modes were observed depending on the composition and cooling rate. ZrO2 containing 6% CeO2 showed isothermal transformation behavior, whereas ZrO2 containing 9% and 10% CeO2 showed athermal transformation behavior. However, ZrO2 containing 8% CeO2 showed either isothermal or athermal transformations behavior depending on the cooling rate. A TTT ( Time - Temperature - Transformation) diagram was proposed for ZrO2 containing 8% CeO2.
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