J. Phys. Colloques
Volume 48, Numéro C3, Septembre 19874th International Aluminium Lithium Conference
|Page(s)||C3-109 - C3-115|
J. Phys. Colloques 48 (1987) C3-109-C3-115
GRAIN REFINING IN Al-Li ALLOYS BY ELECTROMAGNETIC STIRRINGC. VIVES1, J. BAS1 et Y. CANS2
1 Laboratoire de Magnéto-Hydrodynamique, Université d'Avignon, F-84000 Avignon, France
2 Cégédur-Péchiney, Centre de Recherches et Développement, B.P. 27. F-38340 Voreppe, France
The role of forced convection during solidification of Al-Li alloys in an annular crucible was studied. The forced convection was generated by electromagnetic stirring. Maps of electromagnetic body forces and velocity fields were obtained for various stirring intensities and various positions of the solidification front. Temperature measurements made it possible to follow the evolution of the temperature distribution inside the bulk liquid with time. These experiments were carried out in the absence and presence of electromagnetic stirring . A discussion is presented relating the metallurgical findings to the heat and fluid flow measurements. It appears that the effect of electromagnetic stirring results both in a spectacular reduction of the diameter of the columnar crystal and in a decided refinement of the equiaxed grain.