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The impact of melt flow on the grain orientation in solidifying metal alloys

Directional solidification experiments were performed in PbSn and AlSi alloys under the influence of a rotating magnetic field. The solidification process was started without forced melt convection before applying a sudden onset of the electromagnetic force. Just before and after the initiation of the magnetic field the grain structure was analysed. Electrolytic etching was used to identify grains having different orientations and related EBSD measurements provided quantitative values for the crystallographic orientation of the grains. Whereas a distinct asymmetric grain growth or a deflection of the columnar grains becomes obvious in case of forced melt flow, a perceivable modification of the crystal orientation cannot be detected.