Columnar-to-equiaxed transition in solidification processing of ALSi7 alloys in microgravity-the CETSOL project

Gerhard Zimmermann 1 Laszlo Sturz 1 Bernard Billia 2 Nathalie Mangelinck-Noël 2 Dong Rong Liu 2 Henri Nguyen- Thi 2 Nathalie Bergeon 2 Charles-André Gandin 3 David J. Browne 4 Christoph Beckermann 5 Damien Tourret 6 Alain Karma 6
1 ACCESS EV
2 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
3 CEMEF - Centre de Mise en Forme des Matériaux
4 UCD - University College Dublin [Dublin]
5 University of Iowa [Iowa City]
6 Northeastern University [Boston]
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.
keyword : Aluminium-Silicon Alloy Grain Structure Columnar-to-Equiaxed Transition Microgravity Solidification
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01024435
Contributeur : Magalie Prudon <>
Soumis le : mercredi 16 juillet 2014 - 10:31:52
Dernière modification le : mercredi 15 janvier 2020 - 11:00:45

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UNIV-TLN | CNRS | ENSMP | ENSMP_CEMEF | PARISTECH | UNIV-AMU | INSTITUT-TELECOM | PSL | IM2NP

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Gerhard Zimmermann, Laszlo Sturz, Bernard Billia, Nathalie Mangelinck-Noël, Dong Rong Liu, et al.. Columnar-to-equiaxed transition in solidification processing of ALSi7 alloys in microgravity-the CETSOL project. Materials Science Forum, Trans Tech Publications Inc., 2014, 790-791, pp.12-21. ⟨10.4028/www.scientific.net/MSF.790-791.12⟩. ⟨hal-01024435⟩

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