Abstract
The growth of γ/γ'-α eutectic composite was analysed in non-cylindrical moulds from the point of structural changes which were caused by the shape changes during solidification. Shaped eutectic composites were prepared by directional solidification at constant withdrawal rates R_v = (2.72; 4.17; 5.56) × 10^-6 m s^-1 in a modified Bridgman-type apparatus. It was shown that the interfibre spacings ( continually increased in the investigated convergent regions due to the local changes in the growth rates R. The local changes of the growth rates were connected with the changes of heat transfer conditions from solid/liquid interface. Decreasing of the shape factor F caused a change of the position of the solid/liquid interface relatively to a copper chill and its relative movement to the copper chill. Due to this relative interface movement the local growth rates continually decreased which caused a continual increase of the interfibre spacings in the convergent regions.

Key words
γ/γ'-α eutectic composite, solidification, interfibre spacings, growth rates R, Bridgman-type apparatus

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