摘要
针对hcp晶系的镁合金,建立了其二维枝晶生长的相场模型.根据该模型编写模拟程序,得到了具有六重对称性的晶粒形貌,并根据模拟结果分析了温度场对其枝晶臂形成的影响;根据该模型耦合热扰动进行镁合金微观组织模拟,从计算结果中观察到了枝晶臂相互竞争、改变优先生长方向、颈缩、熔断、融合等现象;计算得到的枝晶形貌与实验结果较为吻合.同时还研究了参数的选取对镁合金枝晶发育的影响.
A phase field model of 2D dendritic growth in magnesium alloys with hcp structure was established. Based on the model, a program was developed by VC＋＋, and the simulation results showed sixfold symmetry. On the basis of simulation results, the influence of temperature field on the dendritic arms was analyzed. The process of dendritic growth of magnesium alloys was simulated by using the model coupled with thermal noise. The simulation results showed that some phenomena of dendritic growth were found, such as necking and competitive growth, and there is a high consistency of dendritic morphologies between simulation and experiment. Meanwhile, the influence of parameters on dendritic morphology of magnesium alloys was analyzed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期483-488,共6页
Acta Metallurgica Sinica
基金
国家重点基础研究发展计划项目2005CB724105和2006CB605208资助~~
关键词
相场
镁合金
枝晶形貌
数值模拟
phase field, magnesium alloy, dendritic morphology, numerical simulation
