کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1448970 | 988688 | 2008 | 7 صفحه PDF | دانلود رایگان |
The selection of spacing in directional dendritic solidification is investigated numerically using the phase-field method in two and three dimensions. A criterion for the critical spacing below which no stable array growth can exist is derived from analysis of individual tip shapes. Constricted solute diffusion in the array leads to a deformation of the dendrite tip shape that competes with the deformation due to surface tension anisotropy. At the critical spacing both effects balance and a stable growth solution is destroyed. This mechanism is identified to determine the critical spacing of a dendritic array and leads to a dependence of the spacing on the anisotropy of the solid–liquid interface energy in a similar way as for the dendrite tip radius.
Journal: Acta Materialia - Volume 56, Issue 18, October 2008, Pages 4965–4971