Abstract
Transmission electron microscopy was used to study the sub‐structure of partially stabilized ZrO2 (PSZ) samples, i.e. 2‐phase “alloys” containing both cubic and monoclinic modifications of zirconia, after various heat treatments. Monoclinic ZrO2 exists as (1) isolated grains within the polycrystalline aggregate (a grain‐boundary phase) and (2) small plate‐like particles within cubic grains. These intragranular precipitates are believed to contribute to the useful properties of PSZ via a form of precipitation hardening. These precipitates initially form as tetragonal ZrO2, with a habit plane parallel to the {100} matrix planes. The orientation relations between the tetragonal precipitates and the cubic matrix are image and image
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