Abstract
This work aims at using static annealing as a means to obtain microstructures optimized for high temperature deformation. Eutectic compositions in the zirconia-alumina-magnesium aluminate system have been produced by plasma melting and quenching. The obtained powders were statically annealed and the nucleation and growth processes studied. The quenched powder is partly amorphous, but contains also tetragonal zirconia and traces of gamma alumina. An exothermic peak is obtained in DTA at 950°C and by XRD related to further crystallization of tetragonal zirconia. Alumina precipitates as gamma phase and is transformed via delta phase to alpha alumina at temperatures at and above 1100°C. The material is well crystallized only after heat treatment above 1200°C. The bi-continuous microstructure of zirconia and alumina with low mutual solubility is fairly stable against grain growth. The effects of annealing on sinter forging, high temperature creep and dynamic grain growth are addressed.
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