Dendritic Solidification under Electromagnetic Stirring

Abstract

A mathematical model of dendritic solidification is extended to the magnetohydrodynamic field. by adding Maxwell's equations for the electromagnetic field, coupled with the equations of transport of momentum, energy and solute, through the Lorentz's force tenn. The evolution of fraction of solid, concentrations in both phases, temperature and velocities during solidification, is calculated using as an example a Pb-Sn system. It is found that if the intensity and frequency of the applied field are chosen appropiately, the macrosegregation can be diminished when compared with an alloy solidified without magnetic stirring.