Effect of current density on distribution coefficient
of solute at solid-liquid interface
of solute at solid-liquid interface
(1. Department of Materials and Chemical Engineering,
Liaoning Institute of Technology, Jinzhou 121001, China;
2. School of Metallurgy, University of Science and Technology Beijing,
Beijing 100083, China)
Liaoning Institute of Technology, Jinzhou 121001, China;
2. School of Metallurgy, University of Science and Technology Beijing,
Beijing 100083, China)
Abstract: When current passes through the solid-liquid interface, the growth rate of crystal, solid-liquid interface energy and radius of curvature at dendritic tip will change. Based on this fact, the theoretical relation between the distribution of solute at solid-liquid interface and current density was established, and the effect of current on the distribution coefficient of solute through effecting the rate of crystal growth, the solid-liquid interface energy and the radius of curvature at the dendritic tip was discussed. The results show that as the current density increases, the distribution coefficient of solute tends to rise in a whole, and when the former is larger than about 400A/cm2, the latter varies significantly.
Key words: solidification of metals; distribution coefficient; current density; rate of crystal growth; solid-liquid interface energy; radius of curvature at dendritic tip