非等温Pb-Sn合金枝晶生长的数值模拟  

Modeling of Non-isothermal Dendrite Growth in Pb-Sn Alloy

作　　者：郝丽梅[1] 陈志[2] 

机构地区：[1]西安科技大学基础部 [2]西北工业大学理学院

出　　处：《特种铸造及有色合金》2008年第5期353-356,共4页Special Casting & Nonferrous Alloys

摘　　要：基于相场法,对二元合金的非等温枝晶生长形貌进行了模拟。以铅锡(Pb-Sn)合金为研究对象,展示了枝晶界面形貌的演化过程,研究了它受相场参数的影响规律。结果表明,过冷度、耦合参数和各向异性参数等均对枝晶形貌有影响;引入反溶质截流(ATC)可以有效抑制溶质截流小包和侧边枝的出现;讨论了各向异性参数和枝晶尖端速度的关系。The modeling of non-isothermal dendrite growth in Pb-Sn alloy was conducted based on the phase field method to visualize the evolution of interface morphology of dendrite and to examine the effects of phase parameters on it. The results indicate that the dendrite mosphology is dependent on the under-cooled degree,coupled parameters and anisotropy value. The trapped melt packets and side branches can be greatly suppressed by an anti-trapping current. Furthermore,the relationship between anisotropy and dendrite tip velocity was described.

关 键 词：相场法 Ph-Sn合金 非等温 枝晶生长 尖端速度 反溶质截流 各向异性 

分 类 号：TG131[一般工业技术—材料科学与工程]