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-  2016 

Y对耐热铝导体材料铸态组织和性能的影响

DOI: 10.11951/j.issn.1005-0299.20160512

Keywords: Y,铝导体,晶粒细化,电导率,硬度
Yttrium
,aluminum,conductor,grain,refinement,electrical,conductivity,hardness

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Abstract:

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.
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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