Growth Rate and Habit Plane of Isothermal Martensite Plates in a Zirconia-1.9 mol%Yttria Alloy

抄録

Coarse grained ZrO₂-1.9 mol% Y₂O₃ specimens were prepared by a post-sinter high temperature annealing. The high temperature tetragonal phase of such specimens could be fully retained at room temperature by rapid cooling and allowed to isothermally transform into the stable monoclinic phase by heating at an intermediate temperature. Microscopic observation revealed that well defined thin plate martensite nucleated mostly at grain boundaries and longitudinally grew at considerably low speeds. The habit plane was identified to be near {013}_c, which was close to the previously reported orientations based on transmission electron microscopy works.