Growth of Multicomponent Cellular Composites from the Melt.

In a series of papers in recent years, Flemings and co-workers have used with success a simple model to describe solute redistribution in dendritic solidification of binary and ternary alloys. Basic assumptions of this model are 1 The solid-liquid interface is at equilibrium. 2 There is negligible constitutional supercooling in intercellular regions. 3 The effect of radius of curvature on the melting point is negligible. In this paper, these same assumptions are used to describe cellular solidification in Al-Cu and Al-Cu-Ni alloys at high GR thermal gradient divided by growth rate. The authors assume that solid state diffusion is negligible and that there is no convection in the bulk liquid or in intercellular spaces. They further consider unidirectional solidification with planar isotherms. Hence, according to the second assumption above, isoconcentrates are also planar.