Abstract
The martensitic transformation during a continuous cooling was monitored by the dilatometric and HT-XRD method for the samples of zirconia containing 1.8∼2.0 mol%Y2O3. The alloys exhibited distinctly different Ms (martensite start temperature) for the surface and bulk martensite when the cooling rate was relatively low. From the dilatometric data, the thickness of the surface martensite was estimated to be about 90 \\micron. With increasing cooling rate, the Ms tended to decrease and the transformation was eventually completely suppressed, in agreement with the isothermal nature of the transformation suggested earlier.
