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Elaboration of semisolid alloys by means of new electromagnetic rheocasting processes

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Abstract

The working principle and the peculiarities of new electromagnetic rheocasters, which are based on the use of rotating permanent magnets and which allow the production of intense stirring in solidifying semisolid alloy slurries, are described. Local measurement techniques are applied to the study of the evolution of the electromagnetic, hydrodynamic, and thermal phenomena with time inside vigorously agitated melt-solid mixtures. Satisfactory performances concerning the microstructure of solidified aluminum thixotropic slurries (homogeneity, crystal shape, grain size, and fraction of primary solid) were obtained.

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Abbreviations

Br, Bθ, Bz :

magnetic field components inr, θ, and z directions, respectively

B0 :

stationary magnetic field

B :

magnetic field vector

fs :

solid fraction

Fr, Fθ, F2 :

electromagnetic body force components inr, θ, andz directions, respectively

H :

free surface height

Jr, Jθ, Jz :

electric current density components inr, θ, and z directions, respectively

N :

rotational speed of the inductor

p :

number of pair of poles

U:

velocity vector

Ur, Uθ, Uz :

velocity components inr, θ, and z directions, respectively

UM :

peak of local velocity

U′ :

linear velocity of the rotating magnetic field

W :

Joule dissipation.

Ν :

kinematic viscosity

ρ:

density of the molten alloy

Σ :

electric conductivity of the alloy

Ω0 :

angular velocity of the rotor

ΩM :

peak of the slurry angular velocity

Ω :

angular velocity of the rotating magnetic field

(U′- UM/U′:

slip

ReΩ = R2ΩM/v :

Reynolds number of rotation

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  1. Faculté des Sciences, Laboratoire de Magnétohydrodynamique, Université d'Avignon, 33 rue Louis Pasteur, 84000, AVIGNON, France

    Charles Vives (Professor)

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  1. Charles Vives
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Vives, C. Elaboration of semisolid alloys by means of new electromagnetic rheocasting processes. Metall Trans B 23, 189–206 (1992). https://doi.org/10.1007/BF02651854

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