SEGREGATION DURING HORIZONTAL BRIDGMAN GROWTH UNDER AN AXIAL MAGNETIC-FIELD

Solute segregation in a dilute metallic alloy is investigated during h orizontal Bridgman growth. Experiments have been carried out under a p ermanent uniform axial magnetic field of intensity up to 1.35 T. The h eld is seen to have a moderate effect on axial segregation. A 2D model for segregation is presented and solved both numerically and in terms of order of magnitude analysis. Accounting for the measurement errors and the 2D nature of the analysis, a good agreement is obtained with the experimental results. The theoretical analyses exhibit a critical value for the magnetic held intensity. Below, the magnetic field has n o effect on solute segregation, while above, the effective partition r atio is increasing with increasing magnetic field intensity.