Phase field simulation on directional solidification of succinonitrile (SCN)-acetone organic model alloy

Abstract

Phase field simulation on directional solidification of succinonitrile (SCN)- acetone organic model alloy was performed. The development of concentration and phase field profile was calculated in order to clarify the dependences of growth velocity V and temperature gradient G on the morphology of growing crystal. Concerning the primary dendrite arm spacing, λ 1, the relationship between λ 14G 2V/kΔT 0 and V was examined, where k and ΔT 0 are partition coefficient and temperature difference between liquid and solid phases, respectively. The calculated values of λ 14G 2V/kΔT 0 did not show a universal relationship but the trends of the present calculation can be understood by extrapolation from experimental data. The power law index of V for the λ 14G 2V/kΔT 0-V plot took similar values between the experiments and the present calculation for some cases. The λ 1-V relationship did not show dependences on temperature of the low temperature side and nor acetone concentration. For the curvature radius R, the R-V relationship can be fitted by a simple function regardless the value of G. In addition, the calculated values of R and the power low indexes of V for R were compared to the dendrite growth theory and good accordance was confirmed. © 2005 The Japan Institute of Metals.