Abstract
Refinement of Si crystals in hypereutectic Al–20 wt-%Si alloys was carried out using low frequency electromagnetic vibration direct chill casting of billets with 100 mm diameter. Low frequency electromagnetic vibration was produced in the liquid metal by the simultaneous application of a stationary magnetic field and a variable magnetic field. The stationary magnetic field was generated by supplying an induction coil with direct current. The variable magnetic field was created by another induction coil below the top of the mould, which is supplied with an alternating current. The effects of low frequency and addition of chromium and/or iron were tested. The frequency <37 Hz promoted inhomogeneous distribution of primary Si due to heavy stirring. The diameter of primary Si applied with 27 Hz was ∼19 μm. Cr addition, even on the strong magnetic stirring of 15 Hz, shows refinement and homogeneous distribution of primary Si.
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