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Heterogeneous nuclear issue on the discussion


,[link widoczny dla zalogowanych], If the nucleation rate is not large enough,[link widoczny dla zalogowanych], it is impossible to obtain small grains. In addition, the spherical model from the design of the crown starting to discuss the wetting angle ∽) the impact of nucleation that when a l80 with the same homogeneous nucleation. When the 0-hour race while decreasing the volume of the ball decreases the crown, when the nuclei of the wet angle () tends to 0. , Then the ball into a thin crown nuclei,[link widoczny dla zalogowanych], nuclei size tends to 0; and that the radius of curvature of nuclei did not change (see circle 7). ... A _ · Id i 』々 conditions in homogeneous and heterogeneous holding △,. And r 'switch to Figure 5, the ratio changes and the relationship between cold fact, the original design considerations from the model (around 3),[link widoczny dla zalogowanych], when O-, 0, the nucleus radius of curvature has tended to cc, and (AF 【 ],[can not be a flat surface,[link widoczny dla zalogowanych], the surface radius of curvature of the existence of the various pits of varying sizes. Design of the new thermodynamic model for heterogeneous nucleation. On the one hand consider the pit conditions, but also as far as possible the formation of nuclei growth and development, are all spherical or nearly spherical shape. In this way, and the homogeneous nucleation is more convenient when the control (Fig. . From the first】 thermodynamics of Lianghuan Wen: On the issue of non-homogeneous rod of heterogeneous nucleation must meet fy. Ki,, ~, the article 『cattle. Otherwise, even if there is heterogeneous substances. After suffering homogeneous nucleation can reduce the system but also where the free, crystal is not homogeneous nucleation on non-FI issued to them. From Figure 8, the nucleation model, to meet the above conditions, we found ‰ (Sl +),·+· sJ - 0 \Seen from Figure 9, non-homogeneous nucleation of F. And also smaller, so easier to explain the nucleation undercooling is small and the nucleation rate very high (compare with Fig.) Obviously, based on the basis of homogeneous nucleation of pits on the surface of non-thermodynamic model of homogeneous nucleation. In a more favorable compared. Because all of the spherical nucleus. When the same nuclear radius of curvature, representing the same size, draw, and. While reducing the conclusions crown spherical than the thermodynamic model of nucleation is more reasonable and the actual cutting table. Court 6, the size and rate of {Yl love over the net (\resentful one. . 1_'l,, L \ IA ‰, island | a monopoly of wisdom 9Ak 'changes and then model the relationship between the two forms &
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