Fe和Cu对6061再生铝合金凝固行为和热裂倾向的影响  

Effect of Fe and Cu on Solidification Behavior and Hot Tearing Sensitivity of Recycled 6061 Aluminum Alloy

作　　者：何健松 史明波 杜军[2] HE Jiansong;SHI Mingbo;DU Jun(Qingyuan Zhengtong Metal Products Limited Company,Qingyuan 511515,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]清远市正通金属制品有限公司,广东清远511515 [2]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《铸造技术》2021年第1期1-4,7,共5页Foundry Technology

基　　金：企业委托项目(20172583)——基于6061再生铝制备高品质耐磨铝合金的关键技术开发。

摘　　要：利用双电偶热分析和约束杆模具热裂评价法,研究了Fe和Cu杂质元素对6061再生铝合金凝固特性和热裂倾向(HTS)的影响。结果表明,随着Fe和Cu元素含量的增加,再生铝合金的热裂倾向逐渐增大。Fe元素主要影响再生铝合金初期凝固行为,提高Al13Fe4富铁相的形核温度和含量,促使凝固过程中枝晶搭接完成,阻碍液相流动补缩。Cu元素主要影响再生铝合金末期凝固行为,低熔点Al5Cu2Mg8Si6相显著降低脆性温度区间的下限,并降低固相线附近糊状区强度,导致热裂性能恶化。The influence of Fe and Cu impurity elements on the solidification characteristics and hot tearing sensitivity(HTS)of 6061 regenerated aluminum alloy was studied by using the double thermocouples thermal analysis and the constrained rod casting mold.The results show that with the increase of Fe and Cu content,the hot tearing sensitivity of recycled aluminum alloy increases gradually.Fe mainly affects the initial solidification behavior of the recycled 6061 aluminum alloy,improves the nucleation temperature and content of the Fe-rich phase of Al13 Fe4,promotes the completion of dendrite lap during solidification,and hinders the liquid phase flow feeding.Cu mainly affects the final solidification behavior of the recycled 6061 aluminum alloy.The low melting point Al5Cu2Mg8Si6 phase significantly reduces the lower limit of the brittle temperature range and the strength of the paste zone near the solid phase line,leading to the deterioration of the thermal cracking performance.

关 键 词：6061再生铝合金 热裂 热分析 合金化 凝固过程 

分 类 号：TG146.2[金属学及工艺—金属材料]