纯Ni枝晶生长过程的相场法数值模拟  

Simulation of Dendritic Crystal Growth of Pure Ni Using the Phase-field Model

作　　者：赵宇宏[1,2] 周力[1,2] 王明光[1,2] 牛晓峰[2,3] 赵宇辉[1,2] 侯华[1,2] 任巨良[2,4] 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]中北大学液态成形技术研究中心,山西太原030051 [3]太原理工大学材料与工程学院,山西太原030024 [4]山西泫氏铸业有限公司,山西高平048400

出　　处：《铸造技术》2010年第2期221-224,共4页Foundry Technology

基　　金：国家自然科学基金(50975263);山西省留学基金(2008061);山西省科技创新计划(2008102009)项目资助

摘　　要：采用凝固过程相场模型,对纯Ni过冷熔体中的枝晶生长过程进行了计算模拟,研究了各向异性强度、过冷度、扰动等对枝晶生长的影响.结果表明:随着各向异性强度的增大,枝晶尖端生长速度加快,枝晶结构特征愈加明显;随着过冷度的增加,枝晶尖端稳定性遭到破坏,甚至出现分叉;扰动会促发侧向分枝的形成,但不影响枝晶尖端的稳态生长行为。The phase-field model is used in the numerical simulation of dendritic crystal growth in supercooled melt of pure Ni. The factors of anisotropy, degree of supercooling and thermal noise is investigated in this paper. The simulated result shows that as the degree of anisotropy increases, the growth velocity of dendrite tip is accelerated and characteristic of dendritic structure is more obvious; As the degree of supercooling increases, stability of dendrite tip will be damaged, the dendrite tip branching-off will happen. Stirring power can promote side-branching, but does not affect growth state of dendritic crystal.

关 键 词：相场法 枝晶生长 数值模拟 过冷熔体 

分 类 号：TG111.4[金属学及工艺—物理冶金]