발간논문

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Vol.24, No.6, 705 ~ 712, 1986
Title
An Experimental Study on the Morphological Development of Planar solid - Liquid Interface
한정호Jung Ho Han, 이동희Dong Hi Lee
Abstract
Followings were obtained through the analysis of the morphology of the planar solid-liquid interface developed in the directional solidification of Sn-2 at % Sb alloy. The marginal stability theory was also considered for the analysis. The transition of solid-liquid interface from planar to cellular was observed to be slightly faster than as expected by the theoretical criteria. It was confirmed that the increase in the growth velocity V was the dominant cause for this discrepancy rather than the decrease in the temperature gradients G_l and G_s. However, the solidification process as a whole under this condition appeared to be approximately the steady state. The different degree of the microstructural development was observed in the cross section perpendicular to the growth direction. It is believed that the variation was an intermediate stage to the final morphology of cellular interface. Two possible interpretations for this were also discussed. The critical wavelength of perturbation λ_c evaluated by applying the marginal stability theory was agreed well with the measured value of node spacing λ_n.
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