Abstract
A semi-automatic method of image analysis was used to characterize the evolution of the microstructure of a polycrystalline alumina in terms of grain size and grain shape during different thermomechanical treatments. This study showed that for this material normal grain growth occurs during compressive creep and annealing; in addition, during creep under certain conditions grains flatten in the direction of the applied stress. Three-dimensional estimation of the grain shape was performed by analysing differently oriented plane sections of the specimens.
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