Dependence of Dendritic Side-branches on Parameters in Phase-Field Simulations
Dependence of Dendritic Side-branches on Parameters in Phase-Field Simulations
复制标题
DOI：
10.2320/matertrans.46.15
复制
发表时间：
2005-01
影响因子：
1.2
通讯作者：
Zhu Chang-sheng;Liu Baicheng;Jing Tao;Feng Wenfang
中科院分区：
文献类型：
--
作者：
Zhu Chang-sheng;Liu Baicheng;Jing Tao;Feng Wenfang
采用耦合热噪声的相场模型研究了相场参数对枝晶侧支的影响。计算结果表明，随着过冷度的增大，枝晶周围聚集的热扩散层趋于变薄，有利于侧枝的生长，枝晶呈现发达的侧枝形态；耦合系数λ越小，枝晶尖端速度在格林函数计算中收敛越快，侧分支越发达；各向异性系数E影响枝晶尖端的稳态，E越大，枝晶尖端速度越大，侧分支越发达，DAS越小；热噪声fu的大小对温度场有明显的影响，当fu值适当时，噪声会促进侧支路的出现，但不影响叶尖的工作状态。
The influence of phase-field parameters on dendritic side-branches is studied by using a phase-field model coupled with thermal noise. The result of calculation indicates that, the thermal diffusion layer collected aroundthe dendrite tends to become thinner with the undercooling increasing, which is favorable to the growth of the side-branches and the dendrite takes on the morphology of developed side-branches; The less coupling coefficient λ is, the quicker the dendrite tip velocity converges on the Green function calculation, the more developed the side-branches are; The anisotropy coefficient E influences the steady state of the dendrite tip, the largeris, the greater the dendrite tip velocity is, the more developed the side-branches are and the smaller the DAS is; The magnitude of thermal noise F u has an obvious effect upon temperature field, when appropriate value is assigned to F u , the noise can promote the emergence of side-branches, but it does not influence the tip operating state.