EFFECTS OF FORCED ELECTROMAGNETIC VIBRATIONS DURING THE SOLIDIFICATION OF ALUMINUM-ALLOYS .1. SOLIDIFICATION IN THE PRESENCE OF CROSSED ALTERNATING ELECTRIC-FIELDS AND STATIONARY MAGNETIC-FIELDS
C. Vives, EFFECTS OF FORCED ELECTROMAGNETIC VIBRATIONS DURING THE SOLIDIFICATION OF ALUMINUM-ALLOYS .1. SOLIDIFICATION IN THE PRESENCE OF CROSSED ALTERNATING ELECTRIC-FIELDS AND STATIONARY MAGNETIC-FIELDS, Metallurgical and materials transactions. B, Process metallurgy and materials processing science, 27(3), 1996, pp. 445-455
Citations number
27
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
A new magnetohydrodynamic method of transmitting forced vibrations to
solidifying aluminum alloy melts has been developed. Contrary to the c
ase of the conventional mechanoacoustic systems, this device lends its
elf 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 pe
ak. In the presence of well-developed cavitation situations, a very fi
ne and homogeneous microstructure has been observed throughout the ing
ot. A laboratory prototype of a new magnetohydrodynamic cavity resonat
or, allowing for significant energy saving and likely to be used for i
ndustrial applications, including the elaboration of metal matrix comp
osites by means of a preform infiltration process, was also the subjec
t of experimentation.