弥散相含量对Al-Pb偏晶合金凝固过程影响的数值分析  

Numerical Analysis of Effects of Dispersed Phase Content on Solidification Process in Al-Pb Monotectic Alloy

作　　者：康智强[1] 张煜博 杨雪[1] 冯国会[1] 张林[2] 

机构地区：[1]沈阳建筑大学市政与环境工程学院 [2]东北大学材料电磁过程研究教育部重点实验室

出　　处：《特种铸造及有色合金》2018年第1期34-37,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51401133);辽宁省科学技术基金资助项目(20141074);辽宁省教育厅科学研究项目(L2014230);沈阳建筑大学博士后基金资助项目(SJZUBSH201620)

摘　　要：采用欧拉-欧拉法建立了Al-Pb偏晶合金难混溶区凝固过程弥散相形核、扩散长大、Ostwald熟化、Marangoni迁移等复杂物理过程的数学模型,并以守恒方程为基础建立了弥散相液滴的密度守恒方程以及两相溶质传输方程。结果表明,Al-5Pb偏晶合金相较于Al-10Pb偏晶合金,其组织内部温度场分布均匀、弥散相平均直径较小。分析认为,弥散相含量的降低促使难混溶区液-液相分离和分解速度降低,较易获得弥散相均匀分布的凝固组织。Based on the Euler-Euler method, the mathematical model of complex physical processes such as dispersed phase nucleation, diffusion growth, Ostwald ripening, Marangoni migration, was established, and dispersed phase droplets conservation equation and the density of the two phases based on solute transport equation was described. The results reveal that compared with Al-10Pb monotectic alloy, the microstructure distribution of Al-SPb monotectic alloy exhibits more uniform, and the average diameter of the dispersed phase is the smaller and volume fraction distribution is more uniform. The decrease of the dispersed phase content leads to the decrease of the liquid-liquid phase separation and decomposition rate in immiscible alloy, and it is easier to obtain a solidified structure in which the dispersed phase is distributed uniformly.

关 键 词：偏晶合金 弥散相 凝固过程 数值模拟 

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