Abstract
The martensitic phase transformations of ZrO2 and (Zr, Ce) O2 are characterized by the conspicuous heterogeneous nucleation. The transformation temperatures of the solid solutions with the same lattice parameters change with different heat treatments. The behavior of he transformation changes with grain size and with the repetition of transformation cycle. These changes are due to the autocatalytic nucleation effect and to the new nucleation sites introduced during the cycle of transformation.
