Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys


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This paper presents a summary of cellular and dendritic morphologies resulting from the upward directional solidification of Al – Ni alloys in a cylindrical crucible. We analysed the coupling of solid-liquid interface morphology with natural and forced convection. The influence of natural convection was first analyzed as a function of growth parameters (solute concentration, growth rate and thermal gradient). In a second step, the influence of axial vibrations on solidification microstructure was investigated by varying vibration parameters (amplitude and frequency). Experimental results were compared to preliminary numerical simulations and a good agreement is found for natural convection. In this study, the critical role of the mushy zone in the interaction between fluid flow and solidification microstructure is pointed out.



Edited by:

A Roósz, M. Rettenmayr and Z. Gácsi






H. Nguyen-Thi et al., "Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys ", Materials Science Forum, Vol. 508, pp. 181-186, 2006

Online since:

March 2006




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