Acta Metallurgica Sinica (English Letters) >
Solidification structure of eutectic Al-Si alloy under a high magnetic field-aid-electromagnetic vibration
Received date: 2008-09-02
Revised date: 2008-10-16
Online published: 2009-10-10
An electromagnetic vibration was generated by simultaneously imposing a strong static magnetic field (up to 10 T) and an alternative electricity current to the metal. Its effects on the solidification structure of eutectic Al-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 vibration. Furthermore, polyhedral Si grains and non-dendritic α-Al appeared when the electromagnetic vibration strength was strong enough. The refining of eutectic structure 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-Al.
Jianbo YU , Zhongming REN , Weili REN , Kang DENG , Yunbo ZHONG . Solidification structure of eutectic Al-Si alloy under a high magnetic field-aid-electromagnetic vibration[J]. Acta Metallurgica Sinica (English Letters), 2009 , 22(3) : 191 -196 . DOI: 10.1016/S1006-7191(08)60088-5
[1] E. Croseley and L.F. Mondolfo, AFS Trans 74(1966)53.
[2] F. Paray and J.E. Gruzleski, AFS Trans 115(1994)833.
[3] S.A. Kori, B.S. Murty and M. Chakraborty, Mater Sci Eng 283A(2000)94.
[4] N.R. Pillai, Metall Trans 31(1972)1313.
[5] R.R. Barbure, L. Hareesha and K.S.S. Nurthy, British Foundryman T2(1979)34.
[6] X. Jian, T.T. Meek and Q. Han, Scr Mater 54(2006)893.
[7] A. Radjai, K. Miwa and K. Nishio, Metall Mater Trans 29A(1998)1477.
[8] T. Takagi, K. Iwai and S. Asai, ISIJ Int 43(2003)842.
[9] C. Vives, J Cryst Growth 158(1996)118.
[10] J.P. Choi, K.B. Kim, J.P. Park, E.P. Yoon and T.W. Nam, Mater Sci Forum 475-479(2005)409.
/
| 〈 |
|
〉 |
WeChat