Abstract
The studied material is an alumina fibre acting as a reinforcement in a NiAl/Al2O3 composite. The processing of this composite involves a 1700°C heat treatment. Grain growth phenomena taking place within the fibre during that step are investigated. Above 1600°C, the size of the grains reach the fibre diameter for a 1h heat treatment. Further morphological evolution is discussed using thermodynamic calculations. Taking into account the presence of the liquid alloy, a deepened grain boundary groove is predicted and experimentally observed. The second part of this work deals with grain growth modelling during the heating and cooling steps. A cubic grain growth kinetics law is found and is used to predict final grain sizes as a function of heating and cooling rates.
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