2005 年 46 巻 9 号 p. 2003-2010
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, λ1, the relationship between λ14G2V⁄kΔT0 and V was examined, where k and ΔT0 are partition coefficient and temperature difference between liquid and solid phases, respectively. The calculated values of λ14G2V⁄kΔT0 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 λ14G2V⁄kΔT0–V plot took similar values between the experiments and the present calculation for some cases. The λ1–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.
