| 引用本文: | 韩钰,夏延秋,祝志祥,孙远,宾杰,李红英,杨长龙.Y对耐热铝导体材料铸态组织和性能的影响[J].材料科学与工艺,2016,24(5):71-77.DOI:10.11951/j.issn.1005-0299.20160512. |
| HAN Yu,XIA Yanqiu,ZHU Zhixiang,SUN Yuan,BIN Jie,LI Hongying,YANG Changlong.Effect of Yttrium on as-cast microstructure and properties of heat-resistant aluminum conductor[J].Materials Science and Technology,2016,24(5):71-77.DOI:10.11951/j.issn.1005-0299.20160512. |
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| Y对耐热铝导体材料铸态组织和性能的影响 |
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韩钰1,2,夏延秋1,祝志祥2,孙远3,宾杰3,李红英3,杨长龙4
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(1.华北电力大学 能源动力与机械工程学院,北京102206;2. 先进输电技术国家重点实验室(全球能源互联网研究院), 北京102211; 3.中南大学 材料科学与工程学院,长沙410083;4.国网辽宁省电力有限公司,沈阳 110006)
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| 摘要: |
| 随着特高压输电技术在我国的大力发展，铝合金导体材料作为特高压输电线路的主要组成部分，受到业内的广泛关注.本文采用电导率测试、硬度测试、金相显微镜和扫描电镜观察等手段，研究添加不同含量稀土Y对铸态Al-Zr耐热铝导体材料的影响.研究结果表明：Y元素和Fe、Si等杂质元素形成金属间化合物，可净化基体，改变杂质相的形态和分布，使其粒子化、球化和细化.Y元素在枝晶网络和晶界分布，从而细化晶粒和枝晶组织，但添加量达到0.5%时晶粒细化不均匀.当Y含量为0.2%时，电导率达到60%IACS；当Y含量为0.3%时，硬度达到最高值20.9HBS，且电导率并无明显下降.加入0.3% Y可使耐热铝导体材料获得较好的综合性能.
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| 关键词: Y 铝导体 晶粒细化 电导率 硬度 |
| DOI：10.11951/j.issn.1005-0299.20160512 |
| 分类号:TG146.2 |
| 文献标识码:A |
| 基金项目:国家电网公司科技项目(5455DW150015; 5455DW150013; DG71-12-007). |
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| Effect of Yttrium on as-cast microstructure and properties of heat-resistant aluminum conductor |
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HAN Yu1,2, XIA Yanqiu1,ZHU Zhixiang2, SUN Yuan3, BIN Jie3, LI Hongying3, YANG Changlong4
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(1.School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206,China; 2.State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute), Beijing 102211,China; 3.School of Materials Science and Engineering, Central South University, Changsha 410083, China; 4.State Grid Liaoning Electrical Power Company, Shenyang 110006, China)
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| Abstract: |
| With the development of ultrahigh-voltage transmission technology, aluminum conductors, which are important contents for ultrahigh-voltage transmission line, have attracted much attention recently. The microstructure and properties of as-cast heat-resistant Al-Zr conductor with different amounts of Y were studied by means of electrical resistivity measurement, hardness test, optical microscopy and scanning electron microscopy. The results show that intermetallic compound containing Y and impurity Fe and Si are congregated along the grain boundary and dendritic boundary, which can purify the matrix and change the morphology of impurity phase. The Y atoms distributed on grain boundaries and dendrites increased the composition undercooling of the alloy. As a result, a significant grain refinement has been observed. Alloying of Y refines the grain and dendrite of Al-0.15Zr alloy. A proper addition of Y can improve the electrical conductivity and strength of the alloy. The electrical conductivity and strength of alloys reach the maximum values by adding 0.2% and 0.3% Y, respectively. As a result, the comprehensive property of the alloy would be improved by adding 0.3%Y.
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| Key words: Yttrium aluminum conductor grain refinement electrical conductivity hardness |
