The Effect of Frequency of Electromagnetic Vibration on the Micro Structure in Hypoeutectic Al-Si Alloy
The structural control of Al-Si alloy, which was not studied among various electromagnetic processing of materials, was considered applying the alternating current and direct current magnetic flux density. The main aim of the present study is to investigate the effects of electromagnetic vibration on the macro and microstructure of Al-Si alloy in order to develop a new process of structural control in Al-Si alloy. When the electromagnetic vibration is conducted for changing the shape of primary aluminum, at low frequency (≤ 60Hz), the shape of dendrite is changed speroidal shape. When the electromagnetic vibration is conducted for changing the shape of eutectic silicon, the fact that a morphological change of the eutectic silicon from coarse platelet flakes to fine fiber shape is observed with EMV (Electro Magnetic Vibration) process at high frequency(≥ 500Hz).
C.G. Kang, S.K. Kim and S.Y. Lee
J. P. Choi et al., "The Effect of Frequency of Electromagnetic Vibration on the Micro Structure in Hypoeutectic Al-Si Alloy", Solid State Phenomena, Vols. 116-117, pp. 213-216, 2006