(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 轻质高强结构材料国家级重点实验室，长沙 410083；
3. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 通过金相显微镜(OM)、扫描电镜(SEM)、室温导电率及高温电阻率测试等方法研究富Ce混合稀土对铸态及均匀化态铝合金组织与导电性能的影响。结果表明：富Ce混合稀土对铝合金组织具有细化、变质和净化的作用，加入量为0.10%时细化效果最好；随着富Ce混合稀土加入量的增加，细化效果逐渐减弱，但对含铁杂质相的变质作用加强，导电率逐渐升高，加入量为0.30%时，导电率达到62.10%IACS；合金在570 ℃均匀化24 h后导电率整体上升，富Ce混合稀土加入量为0.30%时，导电率达到62.30%IACS；富Ce混合稀土对铝合金的高温导电性能有不利影响，加入量越多，合金在高温下的电阻率越大，通过均匀化处理可以减小合金的高温电阻率，降低合金电阻率对温度的敏感性。
关键字: 富Ce混合稀土；铝合金；显微组织；室温导电性能；高温导电性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory on Lightweight High-strength Structural Material, Central South University, Changsha 410083, China;
3. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China）
Abstract:The microstructure and electrical conductivity of as-cast and homogenized aluminum alloys with Ce-rich rare earth addition were investigated by OM, SEM, room temperature conductivity and high temperature resistivity test. The results show that RE can refine, modify and purify the microstructure of the aluminum alloy. The grain refinement is the best with 0.10% RE. With the increase of RE addition, the grain refinement is gradually weakened, while the metamorphism of the impurity phase with Fe is strengthened, and the conductivity is gradually increased. When the addition is 0.30%, the electrical conductivity increases to 62.10% IACS. The electrical conductivity increases after homogenization at 570 ℃ for 24 h, and the conductivity can reach 62.30% IACS with 0.30% RE. RE has an adverse effect on the high temperature conductivity of the aluminum alloy, and the more the addition, the greater the resistivity of the alloy at high temperature. The homogenization treatment can reduce the high temperature resistivity and the temperature sensitivity of the alloy.
Key words: RE; aluminum alloy; microstructure; room temperature conductivity; high temperature conductivity
