铝合金微观组织模拟及并行计算  

Microstructure simulation of aluminum alloy using parallel processors

作　　者：冯伟明[1] 许庆彦[1] 柳百成[1] 

机构地区：[1]清华大学机械工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2003年第5期605-608,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金重大项目(59990470-3);国家"九七三"重点基础研究项目(G2000067208-3)

摘　　要：微观组织模拟计算规模庞大,对宏观铸件进行整体微观组织模拟存在极大困难,为此该文将CA(cellularau-tomaton)模型与宏观的传热计算相结合,模拟砂型和金属型铝合金铸件的凝固组织形成过程,提出了改进的CA模型,用更接近实际晶粒轮廓的方法对微观组织进行模拟。在串行算法的基础上开发了相应的并行算法,该算法在保证原有计算精度的前提下,极大地提高了计算规模和效率。对试验结果和模拟结果进行了对照分析,二者基本一致。Microstructures simulation in a whole casting is difficult because of the large amount of calculations. The solidied structure of Al castings was simulated using the cellular automaton model coupled with a macro heat transfer model. A modified cellular automaton model, which uses a more similar shape to the crystal shape, was presented to better simulate the microstructure. A parallel computational method was developed which improves the computing efficiency while maintaining the computing precision. The simulation results agree well with experimental results.

关 键 词：铝合金 微观组织模拟 并行计算 CA模型 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]