Solidification of Undercooled Melts of Al-Based Alloys on Earth and in Space

Dieter M. Herlach; Stefan Burggraf; Peter Galenko; Charles-André Gandin; Asuncion Garcia-Escorial; Hani Henein; Christian Karrasch; Andrew Mullis; Markus Rettenmayr; Jonas Valloton

Solidification of Undercooled Melts of Al-Based Alloys on Earth and in Space

Dieter M. Herlach ^{1, 2, *} Stefan Burggraf ^{2, 1} Peter Galenko ³ Charles-André Gandin ⁴ Asuncion Garcia-Escorial ⁵ Hani Henein ⁶ Christian Karrasch ¹ Andrew Mullis ⁷ Markus Rettenmayr ³ Jonas Valloton ⁶

* Auteur correspondant

1 Institut für Experimentalphysik II

2 DLR Institut für Materialphysik im Weltraum

3 Otto-Schott-Institut für Materialforschung

4 CEMEF - Centre de Mise en Forme des Matériaux

5 Dept. Metalurgia Fisica

6 Chemical and Materials Engineering Department

7 School of Chemical and Process Engineering

Abstract : Containerless processing of droplets and drops by atomization and electromagnetic levitation are applied to undercool metallic melts and alloys prior to solidification. Heterogeneous nucleation on crucible walls is completely avoided giving access to large undercoolings. Experiments are performed both under terrestrial (1 g) conditions and in reduced gravity (µg) as well. Microgravity conditions are realized by the free fall of small droplets during atomization of a spray of droplets, individual drops in a drop tube and by electromagnetic levitation of drops during parabolic flights, sounding rocket missions, and using the electro-magnetic levitator multi-user facility on board the International Space Station. The comparison of both sets of experiments in 1 g and µg leads to an estimation of the influence of forced convection on dendrite growth kinetics and microstructure evolution.

Keywords : Solidification Metals

Type de document :

Article dans une revue

Domaine :

Sciences de l'ingénieur [physics] / Matériaux

Liste complète des métadonnées

https://hal-mines-paristech.archives-ouvertes.fr/hal-01555700
Contributeur : Magalie Prudon <>
Soumis le : mardi 4 juillet 2017 - 12:26:10
Dernière modification le : lundi 12 novembre 2018 - 11:04:03

Solidification of Undercooled Melts of Al-Based Alloys on Earth and in Space

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Solidification of Undercooled Melts of Al-Based Alloys on Earth and in Space

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