基于欧拉多相流技术与元胞自动机方法的Mg-9%Al合金凝固组织模拟  

Simulation on solidification microstructure of Mg-9%Al alloy based on Euler multiphase flow technique and cellular automata method

作　　者：葛鸿浩 王永新 田锡天[1] 陆如辉 GE Hong-hao;WANG Yong-xin;TIAN Xi-tian;LU Ru-hui(School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China;Ningbo Xunhui Electric Appliance Co.,Ltd.,Ningbo 315827,China;School of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]西北工业大学机电学院,西安710072 [2]宁波勋辉电器有限公司,宁波315827 [3]浙江工业大学机械工程学院,杭州310023

出　　处：《中国有色金属学报》2023年第7期2116-2124,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51804274)。

摘　　要：本文基于欧拉多相流技术与元胞自动机方法,构建了镁合金凝固组织演化模型,研究了Mg-9%Al(质量分数)合金单晶粒和多晶粒下的凝固微观组织演化过程;利用本模型研究了熔体流动对晶粒生长的影响;比较分析不同择优生长方向镁合金单晶粒的生长过程。结果表明:晶粒均呈现六重对称结构生长,且各枝晶的生长差异小于10%,验证了模型的可靠性。由于背流区域的溶质传输较慢,形成较小过冷度,导致生长速度减缓,而迎流区域呈现相反的结果。最后,将模型应用到某压铸件肋板处凝固过程分析,获得该区域凝固组织形貌,将模拟结果与实验结果进行比较发现,两者吻合较好。In this article,the solidification microstructure evolution model of magnesium alloy was constructed based on Euler multiphase flow technology and cellular automata method,and the solidification microstructure evolution process of Mg-9%Al alloy under single and multiple grains was studied.In addition,the effect of flow on grain growth was studied by using this model.The growth process of single grain of magnesium alloy with different preferred growth directions was compared and analyzed.The results show that the grain growth shows six fold symmetric structure,and the growth length of dendrites is less than 10%,which verified the reliability of the model.The growth rate is slowed down due to the slow transport of solutes in the backflow region and the formation of small undercooling degree,while the opposite result was found in the oncoming area.Finally,the model was successfully applied to analyze the solidification structure of a die-casting rib,and the non-uniform solidification structure morphology is obtained.The simulation results are in good agreement with the experimental results.

关 键 词：镁合金 组织模拟 欧拉多相流 元胞自动机 

分 类 号：TG111.4[金属学及工艺—物理冶金]