Effect of the electromagnetic vibration on the distribution and morphology of primary silicon in Al-Si hypereutectic alloy solidified under a high magnetic field
YU Jian-Bo
上海大学
Cite this article:
YU Jian-Bo. Effect of the electromagnetic vibration on the distribution and morphology of primary silicon in Al-Si hypereutectic alloy solidified under a high magnetic field. Acta Metall Sin, 2007, 43(9): 994-998 .
Abstract The effect of electromagnetic vibration on the distribution and morphology of primary silicon in the Al-18wt%Si alloy has been investigated systematically in this paper. The experimental results show that the primary silicon agglomerated and expelled to the top of the sample when the magnetic intensity is low(2T). The ssegregation of silicon grains decreased gradually and the phenomenon of agglomerating disappeared with the increase of magnetic intensity (10T), and the star-like coarse primary silicon turned refined flake or square. It is shown that the movement of primary silicon is depended on gravity and the effective viscous force caused by the magnetic field,and the terminal migration velocity is proportional to the radium of primary silicon and inversely to the intensity of magnetic field. The observed results are approximately agreed with the theoretical analysis.