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Columnar-to-Equiaxed Transition in Solidification Processing of AlSi7 Alloys in Microgravity the CETSOL Project

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Abstract:

This paper gives an overview of the experiments on-board the International Space Station (ISS) performed so far by the CETSOL team. Al-7 wt% Si alloys with and without grain refiners were solidified in microgravity. Detailed grain structure analysis showed columnar growth in case of non-refined alloy, but the existence of a columnar to equiaxed transition (CET) in refined alloy. One main result is a sharp CET when increasing the solidification velocity and a progressive CET for lowering the temperature gradient. Applying a front tracking model this behavior was confirmed numerically for sharp CET. Using a CAFE model both segregation and grain structures were numerically modeled and show a fair agreement with the experimental findings.

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Periodical:

Materials Science Forum (Volumes 790-791)

Pages:

12-21

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.790-791.12

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Online since:

May 2014

Authors:

Gerhard Zimmermann*, L. Sturz, B. Billia, N. Mangelinck-Noël, D.R. Liu, H. Nguyen Thi, N. Bergeon, C.A. Gandin, D.J. Browne, C. Beckermann, D. Tourret, A. Karma

Keywords:

Aluminium-Silicon Alloy, Columnar-To-Equiaxed Transition, Grain Structure, Microgravity, Solidification

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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