Solidification structure of eutectic Al-Si alloy under a high magnetic field-aid-electromagnetic vibration
来源期刊：Acta Metallurgica Sinica2009年第3期
论文作者：Yunbo ZHONG Kang DENG Weili REN Zhongming REN Jianbo YU
Key words：Strong magnetic field; Electromagnetic vibration; Eutectic solidification; Polyhedral Si; Al-Si alloy;
Abstract: An electromagnetic vibration was generated by simultaneously imposing a strong sta-tic magnetic field (up to 10 T) and an alternative electricity current to the metal.Its effects on the solidification structure of eutectic A1-Si alloy have been investigated experimentally. It is found that the eutectic structure has been refined by solely imposing high magnetic field while it is coarsened under the electromagnetic vibra-tion. Furthermore, polyhedral Si grains and non-dendritic a-A1 appeared when the electromagnetic vibration strength was strong enough. The refining of eutectic struc-ture is attributed to the decrease of diffusion coefficient caused by the strong magnetic field. The coarseness of eutectic structure may be attributed to the convection caused by electromagnetic vibration. Strong convection may break co-operative growth of eutectic phases to form polyhedral Si grains and non-dendritic α-A1.
Yunbo ZHONG1，Kang DENG1，Weili REN1，Zhongming REN1，Jianbo YU1
(1.Department of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)
Abstract:An electromagnetic vibration was generated by simultaneously imposing a strong sta-tic magnetic field (up to 10 T) and an alternative electricity current to the metal.Its effects on the solidification structure of eutectic A1-Si alloy have been investigated experimentally. It is found that the eutectic structure has been refined by solely imposing high magnetic field while it is coarsened under the electromagnetic vibra-tion. Furthermore, polyhedral Si grains and non-dendritic a-A1 appeared when the electromagnetic vibration strength was strong enough. The refining of eutectic struc-ture is attributed to the decrease of diffusion coefficient caused by the strong magnetic field. The coarseness of eutectic structure may be attributed to the convection caused by electromagnetic vibration. Strong convection may break co-operative growth of eutectic phases to form polyhedral Si grains and non-dendritic α-A1.
Key words:Strong magnetic field; Electromagnetic vibration; Eutectic solidification; Polyhedral Si; Al-Si alloy;
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