(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 輕質(zhì)高強(qiáng)結(jié)構(gòu)材料國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
3. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 通過(guò)金相顯微鏡(OM)、掃描電鏡(SEM)、室溫導(dǎo)電率及高溫電阻率測(cè)試等方法研究富Ce混合稀土對(duì)鑄態(tài)及均勻化態(tài)鋁合金組織與導(dǎo)電性能的影響。結(jié)果表明：富Ce混合稀土對(duì)鋁合金組織具有細(xì)化、變質(zhì)和凈化的作用，加入量為0.10%時(shí)細(xì)化效果最好；隨著富Ce混合稀土加入量的增加，細(xì)化效果逐漸減弱，但對(duì)含鐵雜質(zhì)相的變質(zhì)作用加強(qiáng)，導(dǎo)電率逐漸升高，加入量為0.30%時(shí)，導(dǎo)電率達(dá)到62.10%IACS；合金在570 ℃均勻化24 h后導(dǎo)電率整體上升，富Ce混合稀土加入量為0.30%時(shí)，導(dǎo)電率達(dá)到62.30%IACS；富Ce混合稀土對(duì)鋁合金的高溫導(dǎo)電性能有不利影響，加入量越多，合金在高溫下的電阻率越大，通過(guò)均勻化處理可以減小合金的高溫電阻率，降低合金電阻率對(duì)溫度的敏感性。
關(guān)鍵字: 富Ce混合稀土；鋁合金；顯微組織；室溫導(dǎo)電性能；高溫導(dǎo)電性能
（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
