Abstract
Precipitate coarsening involving preferential growth of solute‐poor tetragonal ZrO2 precipitates along grain boundaries, combined with migration of grain boundaries containing a liquid silicate phase to form solute‐rich precipitate‐free cubic ZrO2, has been observed in grain boundary regions of MgO–CaO–ZrO2 and CaO–ZrO2 alloys during isothermal aging at 1400°C. Studies of alloys with 9.5 mol% total solute, but with varying MgO/CaO ratios, demonstrated a marked composition dependence of the phase separation process, in that such phase separation was rare in MgO‐rich materials. The migration process is analyzed using models developed for migration in less complex materials, and a mechanism incorporating orientation‐dependent precipitate strain energies is proposed.
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