Abstract
Eutectic microstructures are one of the most common solidification patterns in the binary or multi-component alloy systems. Due to the fine periodic microstructures of the eutectic alloys, the commercial applications of the eutectic alloys can improve the mechanical properties of the castings. The solidification mechanism of eutectic alloys has been widely stud- ied by a lot of experimental works and theoretical analysis over the years. Recently, numerical models were used to study the mechanisms of formation of phase patterns and selection dynamics of the lamellar eutectic, such as phase field (PF) and cellular automaton (CA) model, which can promote the development of eutectic growth theory. Based on the existing CA method for binary primary α phase, a modified cellular automaton (MCA) model was developed for the simulation of binary eutectic growth. In this model, the influence of constitutional and curvature undercooling on the interface morphology was considered. The growth rate of eutectic interface was calcu- lated by the solute conservation at the α/liquid and β/liquid interfaces. The model could simulate the phenomenon of overgrowth, splitting and steady state growth of the eutectic lamellar. CBr4-C2Cl6
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