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The mechanical performance of ceramic matrix composites (CMC) is strongly related to the properties of the reinforcement. In case of the polycrystalline alumina Nextel® 610, these are dominated by the grain structure of the fiber. Within this study we show, that the surrounding matrix material and the processing conditions exert a high impact on the microstructure of the fibers. Therefore, different matrices and manufacturing methods can result in different fiber structures and performances.