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Effects of forced electromagnetic vibrations during the solidification of aluminum alloys: Part I. solidification in the presence of crossed alternating electric fields and stationary magnetic fields

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Abstract

A new magnetohydrodynamic method of transmitting forced vibrations to solidifying aluminum alloy melts has been developed. Contrary to the case of the conventional mechanoacoustic systems, this device lends itself very well to a fundamental investigation. The relatively accurate knowledge of both the electromagnetic pressure and the local velocity peaks has enabled us to reveal the specific effects of the oscillatory flow and of the cavitation phenomena on grain refinement. It has been shown that the cavitation threshold depends both on the surface state of the crucible internal walls and on the electromagnetic pressure peak. In the presence of well-developed cavitation situations, a very fine and homogeneous microstructure has been observed throughout the ingot. A laboratory prototype of a new magnetohydrodynamic cavity resonator, allowing for significant energy saving and likely to be used for industrial applications, including the elaboration of metal matrix composites by means of a preform infiltration process, was also the subject of experimentation.

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Abbreviations

a:

mold width

B 0 :

stationary magnetic field

B:

amplitude of the induced magnetic field

b:

magnetic field induced byj

E 0 :

rms of the electromotive field generated byu and B0

E:

amplitude of the externally imposed electric field

e:

amplitude of the alternating fluid motion

F:

electromagnetic body force

f s :

solid fraction

g:

gravity

h:

mold height

h′:

depth

I:

amplitude of the electric current intensity

i:

variable electric current intensity

J:

amplitude of the electric current density

j:

conduction current density

j d :

displacement current density

L:

mold length

N:

frequency

P:

amplitude of the oscillatory pressure

P*:

normalized pressure amplitude

t:

time

u:

variable velocity

U:

amplitude of the variable velocity

V:

voltage generated byE

V 0 :

voltage generated by E0

γ:

acceleration

μe:

electric permittivity

μ:

magnetic permeability

ρ:

density

σ:

electric conductivity of the alloy

ϕ:

phase angle

ω:

current angular frequency

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Authors and Affiliations

  1. Faculty of Science, Laboratory of Magnetohydrodynamics, University of Avignon, 84000, Avignon, France

    Charles Vivès (Professor)

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  1. Charles Vivès
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Vivès, C. Effects of forced electromagnetic vibrations during the solidification of aluminum alloys: Part I. solidification in the presence of crossed alternating electric fields and stationary magnetic fields. Metall Mater Trans B 27, 445–455 (1996). https://doi.org/10.1007/BF02914909

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  • DOI: https://doi.org/10.1007/BF02914909

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