Melt Conditioned Casting of Aluminum Alloys
High shear melt conditioning of aluminum alloy melts disperses oxide films and provides potent nuclei to promote non-dendritic solidification leading to refined as cast microstructures for shape castings, semis or continuously cast product forms. A new generation of high shear melt conditioning equipment has been developed based on a dispersive mixer that can condition either a batch melt or can provide a continuous melt feed. Most significantly the melt conditioner can be used directly in the sump of a DC caster where it has a dramatic effect on the cast microstructure. The present goals are to expand the castable alloy range and to increase the tolerance of alloys used in transport applications to impurities to increase the use of recycled metal. The paper will review the current status of the melt conditioning technology across the range of casting options and will highlight development opportunities.
KeywordsMelt conditioning Aluminum alloys Grain refinement
Unable to display preview. Download preview PDF.
- 1.J. Campbell, Castings. 2nd Ed. (Oxford: Butterworth-Heinemann, 2003), 2–7.Google Scholar
- 2.D. V. Neff, ASM Handbook, vol. 15 Casting, (ASM, 2008), 194.Google Scholar
- 6.S. A. Impey, D. J. Stephenson and J. R. Nicholls, (Paper presented at the first international conference on the microscopy of oxidation, University of Cambridge,1991).Google Scholar
- 8.K. Wefers and C. Misra, Oxides and Hydroxides of Aluminium. Alcoa, USA: Alcoa Laboratories; 1987.Google Scholar
- 10.H. T. Li, PhD Thesis. Brunel University, Uxbridge, UK; 2011.Google Scholar
- 11.H. T. Li, Y. Wang and Z. Fan, Acta Mater, 60 (2012), 1258–1537.Google Scholar
- 13.Z. Fan, Proceedings of the John Hunt Symposium, Brunel University, 2011, p29–44.Google Scholar
- 14.J. Gibbs, In: Collected Works of J. Willard Gibbs, V1. NY: Langman, Green and Co; 1928.Google Scholar