强迫对流下各相场参数对枝晶生长的影响

利用耦合流场的相场模型,以N-iCu二元合金为例研究各相场参数对金属凝固过程中枝晶生长的影响。结果表明:对流对枝晶形貌影响很大,上游枝晶的枝晶臂最长,下游枝晶臂最短,整个枝晶呈现非对称形貌;对流速度越大,上游枝晶生长越快;各向异性系数越大,主枝枝晶臂越瘦长;扰动的引入可以促进枝晶二次枝晶臂的生长,但基本上不影响枝晶尖端稳态行为。

Effects of phase field parameters on dendritic growth under a forced convection

The phase-field model which couples the flow field is used to simulate the dendrite growth in a Ni-Cu binary alloy.The effects of Phase-field parameters on dendritic crystal growth were studied.The result shows that: the dendritic shape changed dramatically,the branch of upstream dendritic crystal was the longest while the downstream the shortest,and the horizontal branch was between the two;the larger velocity of convection was,the quicker of the dendrite tip velocity;the larger anisotropy parameter was,th...