Rheological Characteristics of Mg-Al Alloys with Ceramic Particles for Meta Foam


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Foamed metal is a kind of porous material with pores in the metal matrix. One of the possible process routes is to blow gas bubbles into liquid metals. However, many metallic foams produced by this foaming method have coarse and irregular cell structures. The industrial aim is to fabricate foams with more uniform structure and cell size. It is important to understand the mechanisms and factors controlling. The rheological characteristics are the most important factors in the metal foam manufacturing. Thus this study investigated the bubble behavior of the molten metal and its two most important two parameters: surface tension and liquid viscosity. The surface tension (by the ring method) and the viscosity (by the rotation method) of Mg-Al alloy (AZ91, AM60) have been measured under pure Ar and SF6 + CO2 atmosphere. The results show that the surface tension and the viscosity of these alloys decrease with increasing temperature. The addition of Ca and SiC to Mg alloys decreases the surface tension and increases the viscosity. This anomalous behavior is related with the preferential adsorption of high activity elements on the surface.



Materials Science Forum (Volumes 510-511)

Edited by:

Hyung Sun Kim, Yu Bao Li and Soo Wohn Lee






S. H. Park et al., "Rheological Characteristics of Mg-Al Alloys with Ceramic Particles for Meta Foam", Materials Science Forum, Vols. 510-511, pp. 742-745, 2006

Online since:

March 2006




[1] J. Banhart, M. Ashby and N. Fleck: Cellular Metals and Metal Foaming Technology (Verlag MIT Publishing 2001).

[2] M. Meier, D. Hille and G. Wallot: Experiments on the stability of solid-particle-loaded aqueous foams (Cellular Metals: Manufacture, Properties, Applications, MIT-Verlag Publication 2003).

[3] T. Iida: The Physical Properties of Liquid Metals (Clarendon press. Oxford 1988).

[4] J. P. Anson, R. A. L. Drew and J. E. Gruzleski: Met. & Mater., Trans. B, 30 (1998), p. (1999).

[5] Y. Shiraishi: J. of Kor. Inst. Met & Mater., Vol. 25 (1987), p.11.

[6] S.H. Park and B.Y. Hur: Materials Science Forum, 486-487 (2005), pp.464-467.

[7] D. Skupien and D. R. Gaskell: Met & Mater., Trans. B, Vol. 31 (2000), p.921.

[8] J. W. Gibbs: Thermodynamics (The Collected Works of J. W. Gibbs, vol. I, Yale Univer. Press, New Haven, CT 1948).

[9] S. H. Park, B. Y. Hur, S. Y. Kim, D. K. Ahn: Proceedings of the 65th World Foundry Congress (2002), p.515.

[10] J. Banhart: Journal of Metals 52 (2000), pp.22-27.

[11] G. Kaptay, Colloids and Surfaces A: Physicochem. Eng. Aspects, 230 (2004), pp.67-80.

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