Influence of the Electromagnetic Stirring on Globularization of Primary Solid Phase in Solid-Liquid Region


Article Preview

Forming of alloy and composite within a solid-liquid region, i.e. thixo-forming and rheo-forming, has been recognized as a technology offering several potential advantages over casting and forging such as a low forming pressure, reduction of macrosegregation, and reduction of porosity. In this paper, a globularization for primary solid phase by a forced fluid flow in melt due to electromagnetic stirring during solidification and isothermal stirring at solid-liquid region, was examined to produce Al alloy having a globular solid phase to get a thixotropic behavior. The electromagnetic stirrer was specially designed and manufactured to create all kind of fluid flow pattern such as a circumferential, vertical, helicoidally and contra-rotating flow pattern during the solidification of a melt. The size and roundness of primary solid phase of the quenched sample after isothermal stirring at solid-liquid region were measured with respect to a stirring time and frequency. The globularization of solid phase was enhanced with incresing the stirring time and electromagnetic flux density, i.e. stirring strength.



Materials Science Forum (Volumes 486-487)

Edited by:

Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee




D. Y. Lee et al., "Influence of the Electromagnetic Stirring on Globularization of Primary Solid Phase in Solid-Liquid Region", Materials Science Forum, Vols. 486-487, pp. 550-553, 2005

Online since:

June 2005




[1] D. B. Spencer, R. Mehrabian and M. C. Flemings, Metall. Trans. 3 (1972) (1925).

[2] M. C. Flemings, Metal. Trans. 22A (1991) 957.

[3] D. H. Kirkwood, inter. Mater. Atew. 39 (1994) 173.

[4] N. Apaydin, K. V. Prabhakar and R.D. Doherty, Mater. Sci. Eng., 46 (1980).

[5] J. M. M. Molenaar, W. H. Kool and R.J. Smeulders, J. Mater. Sci., 22(1987) 1057.

[6] G. Wan and P.R. Sahm, Acta Metall. Mater., 38 (1990).