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

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.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-mines-paristech.archives-ouvertes.fr/hal-01024435
Contributeur : Magalie Prudon <>
Soumis le : mercredi 16 juillet 2014 - 10:31:52
Dernière modification le : vendredi 29 mars 2019 - 10:36:02

Identifiants

Citation

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⟩

Partager

Métriques

Consultations de la notice

598