Modification of pure Al and AlSi2 alloy primary structure with use of electromagnetic stirring method

The paper presents modification of primary structure of A1 99,5% and 99,8% purity and AlSi2 alloy by electromagnetic stirring of liquid metal within foundry mould. The movement of solidifying liquid metal within the mould was forced by horizontal electromagnetic field produced by the induction coil (stirrer), supplied by current of elevated frequency. The structure refinement obtained by electromagnetic stirring was compared with refinement obtained by traditional modification, i.e. by introducing Ti, B, C and Sr modifying additives into melt. The results of studies show possibility of effective primary structure refinement of pure A1 and selected Al-Si alloy by using only horizontal electromagnetic field, without necessity of Ti, B and C additives application.