摘要
基于实际定向凝固系统的对称性，采用线性近似方法计算了柱坐标系中、扩散控制条件下二元合金走向凝固时微弯曲固液界面导致的溶质径向下均匀分布结果表明溶质径向分凝定性上正比于溶质Peclet数。
Based on the symmetry of an actual unidirectional solidification system, the slightly curved liquid-solid interface related radial solute distribution inhomogeneity during difFusion-controlled steady-state unidirectional solidification of a binary alloy is calculated by means of linear approximation in a cylindrical coordinate system. The results show that the radial solute segregation is qualitatively proportional to the solute Peclet number. relative interface depth h. R-1 and (1-k). where k is the equilibrium solute partition coefficient. Also, it is slightly quantitatively smaller than Coriell et al's result gotten from the planar rectangular coordinate system.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1998年第2期123-127,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金!59672004
关键词
定向凝固
弯曲固液界面
溶质径向分凝
晶体生长
unidirectional solidification, curved liquid-solid interface. radial solute segregation
