EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The experiments aimed to investigate the effect of stirring by Travelling Magnetic Field on the solidified micro- and mesostructure of Al7Si alloy without and with grain refinement (GR).
The solidification experiments were performed in a Bridgman-type furnace in earth conditions at a constant sample-movement velocity (vmov = 0.1 mm/s) and different temperature gradients (G) without stirring the melt as well as during a magnetic stirring of different intensity. The diameter of the samples was 8 mm, and their length was 110 mm. In the solidification process, the sample's temperature was measured at 13 points using thermocouples. On the parallel section of the sample, the secondary dendrite arm spacing, the amount of eutectic and the concentration distribution, and on the cross section of the sample, the primary dendrite arm spacing (PDAS) and the grain number were measured.