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Article Dans Une Revue Materials Science Forum Année : 2014

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

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Résumé

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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Dates et versions

hal-01024435 , version 1 (30-09-2022)

Licence

Paternité - Pas d'utilisation commerciale - CC BY 4.0

Identifiants

Citer

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, 2014, 790-791, pp.12-21. ⟨10.4028/www.scientific.net/MSF.790-791.12⟩. ⟨hal-01024435⟩
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