用相场法研究界面动力学各向异性对纯Ni枝晶生长的影响  

Influence of Interface Kinetic Anisotropy onPure Ni Dendrite Growth Using Phase Field Method

作　　者：袁训锋[1,2] 

机构地区：[1]商洛学院电子信息与电气工程学院,陕西商洛726000 [2]商洛学院陕西省尾矿资源综合利用重点实验室,陕西商洛726000

出　　处：《铸造技术》2014年第8期1773-1775,共3页Foundry Technology

基　　金：陕西省教育科学"十二五"规划资助项目(SGH13401);商洛学院博士启动基金资助项目(12SKY01-1)

摘　　要：基于耦合流场的Wheeler模型,对界面各向异性作用下纯镍枝晶生长过程进行模拟,研究了界面动力学各向异性对枝晶形貌及尖端生长行为的影响。结果表明:在仅有界面能各向异性(ε4)时,晶粒以枝晶方式沿<100>方向生长;在仅有界面动力学各向异性(εk)时,晶粒以枝晶方式沿<110>方向生长。界面同时存在ε4、εk时,随着εk的增加,晶粒优先生长方向由<100>过渡到<110>方向,[100]和[-100]方向尖端稳态速度减小,稳态温度升高。当ε4=εk=0.04时,随着凝固时间的推移,晶粒形貌由伞状经类正方形向发达枝晶形貌转变。The pure Ni dendrite growth process was simulated under the effect of interface anisotropy based on Wheeler model of coupling flow field. The effects of interface kinetic anisotropy on dendrite morphology and tip growth behaviour were studied. The results show that the dendrite growth orientation along the 〈100〉 and 〈110〉 when there only exists interface energy anisotropy（E4） and only exists interface kinetic anisotropy（ek）, respectively. When the interface concurrence 64 and εk, the preferred growth directions of dendrite change from 〈100〉 to 〈110〉 as εk increases, the tip velocities decrease and temperature increase at 〈100〉 and 〈-100〉 directions in steady state. With increasing solidification time, the dendrite morphologies change from umbrella shape to square-like shape, and finally change to the developed dendrite morpholo.gy when ε4=εk =0.04.

关 键 词：相场模型 强制流动 枝晶生长 界面动力学各向异性 

分 类 号：TG146.15[一般工业技术—材料科学与工程]