Paper Titles
Experimental Observation of Convection during Equiaxed Solidification of Transparent Alloys
p.157
Control of the Macrosegregations during Solidification of a Binary Alloy by Means of a AC Magnetic Field
p.163
The Effect of Melt Flow on the Dendrite Morphology
p.169
Segregation with Spongy Deformation of the Mushy Zone during Solidification of the Skin of Steel Cast Products
p.175
Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys
p.181
Macrosegregation Caused by Deformation of the Mushy Zone
p.187
Gravity-Induced Convection during Directional Solidification of Hypermonotectic Alloys
p.193
Solidification of AlSi Alloys in the ARTEMIS and ARTEX Facilities Including Rotating Magnetic Fields – A Combined Experimental and Numerical Analysis
p.199
Solidification and Melting – Asymmetries and Consequences
p.205

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

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Abstract:

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.

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Periodical:

Materials Science Forum (Volume 508)

Pages:

181-186

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.508.181

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Online since:

March 2006

Authors:

Henri Nguyen-Thi, Bing Hong Zhou, Guillaume Reinhart, Bernard Billia, Q.S. Liu, C.W. Lan, Tatyana Lyubimova, B. Roux

Keywords:

Cells, Dendrites, Directional Solidification, Forced Convection, Natural Convection, Vibrational Control

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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