基于CAFE法的纯铝晶粒细化组织演变研究  

Grain Refinement Microstructure Evolution of Pure Al Based on CAFE Module

作　　者：唐佳[1,2] 蔡庆[1] 张亦杰[1] 王浩伟[1] 黄迎九 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海工程技术大学工程实训中心,上海201620 [3]上海紫竹新兴产业技术研究院,上海200240

出　　处：《铸造技术》2015年第4期964-968,共5页Foundry Technology

摘　　要：运用CAFE方法对纯铝晶粒细化过程的宏观晶粒组织演变进行研究,采用非均匀形核模型及改进的KGT模型对形核过程及枝晶长大CET转变过程进行模拟。晶粒细化实验证明模拟结果和实验结果相一致。说明利用Pro CAST的CAFE模块,通过建立合理的体形核密度及过冷度可以实现对纯铝细化前后的晶粒度进行预测。通过模拟与实验结果相结合的方法揭示了微量元素Fe在晶粒细化过程中的作用机理。Based on ProCAST software, the grain macrostructure evolution of pure Al after grain refinement was studied. To improve the accuracy and reliability of simulation, heterogeneous nucleation model and improved KGT model was employed to simulate the columnar to equiaxed transition （CET） of dendrite. More important, simulation results were highly agreed with the experimental results. This indicates that the microstructure prediction of A1 grain can be achieved successfully via proper creation of volume nucleation sites density and supercooling in CAFE module of ProCAST. Combination with simulation and experiment results, the refinement mechanism of Fe on grain was revealed.

关 键 词：晶粒细化 CAFE 模拟 纯铝 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]