各向异性对过冷熔体中枝晶生长影响的相场法模拟  

Phase-field Simulations of the Effect of Anisotropy on Dendritic Growth in Undercooled Melt

作　　者：何可龙 龙文元[2] 

机构地区：[1]江西省电力科学研究院,南昌330006 [2]南昌航空大学材料科学与工程学院,南昌330034

出　　处：《铸造工程》2007年第2期31-34,共4页Foundry Engineering

基　　金：江西省材料科学与工程研究中心开放基金项目（ZX200301017）

摘　　要：文中采用二元合金的等温相场模型，通过在相场参数中引入界面能各向异性强度参数，以A1-4．5％Cu合金为例模拟了各向异性强度对二元合金凝固过程的枝晶生长的影响。结果表明：各向异性强度小时，枝晶形貌呈海藻态，随着各向异性强度的增大，枝晶形貌从海藻态向枝晶态转变，主枝不再分叉，成为光滑枝晶，枝晶尖端生长速度增大，曲率半径减小并逐渐趋于定值，同时模拟的结果与经典枝晶生长理论相吻合。The effect of anisotropy on the dendritic growth during A1-4.5%Cu binary alloy solidification are simulated using the phase-field model. The results show that the magnitude of anisotropy affects the steady state of the dendritic tip. If the the magnitude of anisotropy is increased, the seaweed morphology is transformed into the dendritic morphology, the tip speed increases, and the tip radius decreases with the magnitude of anisotropy incresaes; Simultaneously the simulation results are agree well with the dendritic growth theory.

关 键 词：相场法 枝晶生长 各向异性 

分 类 号：TG111.4[金属学及工艺—物理冶金]