Abstract
The toughness of magnesia-partially stabilized zirconia (Mg-PSZ) is controlled by metastable tetragonal precipitates that interact with crack tip stress fields. Understanding and controlling the precipitate size controls the resulting properties. The precipitate growth behaviour of Mg-PSZ (9·5 mol% MgO) samples was studied after an experimental regime of sintering, rapid quenching and isothermal aging at 1400°C and 1320°C. Average precipitate size on polished and etched samples was measured by SEM for each processing time and temperature. Precipitate sizes, precipitate population statistics, phase content of transformable tetragonal phase and fracture toughness are plotted and optimum precipitate sizes for maximum toughness are identified. Relationships between experimental results and martensitic theories are discussed. The precipitate population distributions did not follow those predicted by Lifshitz-Slyozov-Wagner-based theories.
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