纤维增强铝基复合材料凝固偏析模拟研究  

Simulation Study on Solidification Microsegregation in Fiber Reinforced Aluminum Matrix Composites

作　　者：靖青秀[1] 朱应禄[1] 

机构地区：[1]江西理工大学材料与化学工程学院,江西赣州341000

出　　处：《轻合金加工技术》2005年第8期45-47,共3页Light Alloy Fabrication Technology

基　　金：国家教育部科学技术研究重点项目(00191);江西省自然科学基金项目(0150032)

摘　　要：由凝固过程中的三大守恒定律,建立了金属基复合材料凝固数学模型。根据所建立的模型对Al2O3f/Al-4.5Cu复合材料进行数值模拟,并在与模拟计算相同条件下进行了实验验证。模拟结果表明:Al2O3短纤维周围存在第二相偏析;随凝固冷却速度增大,复合材料基体偏析加剧;随复合材料中纤维体积分数增大,基体中偏析减小;模拟结果与实验结果十分吻合。The solidification model of composites was established according to the laws of conservation. The numerical simulation of Al2O3f/Al-4.5Cu composite was carried out with the model. On the same condition as the simulative calculation used, some relative experiments were, performed. The simulative results indicate that the second phases with high solute concentration are concentrated around Al2O3 short fibers. The concentration segregation in the matrix is increased with cooling rate rising and decreased with fiber volume increasing. The nmnerical simulation accords with the experiments very well.

关 键 词：复合材料 凝固 数值模拟 偏析 

分 类 号：TB331[一般工业技术—材料科学与工程]