铝合金电缆连接件用高性能棒材的微合金化研究

Research on Microalloying of High Performance Bars for Aluminum Alloy Cable Connection Fittings

铝合金电缆连接件对材料的抗压蠕变性能和导电性能要求较高。本试验采用力学性能测试、导电率测试、蠕变测试等性能测试手段以及金相显微镜、扫描电镜、XRD分析及能谱分析等微观测试方法,研究水平热顶模半连续铸造和挤压工艺下,Fe、Cu、Zr、Mg等微合金化元素对铝合金电缆连接件用棒材性能的影响。研究表明:Zr元素可明显提高材料的抗压蠕变性能,但Zr元素的添加会恶化材料的导电性能;相比Fe而言,微量Cu元素的添加在一定程度上可提高材料的抗压蠕变性能,同时提高导电性能;Mg元素可极大地改善材料的抗压蠕变性能,特别是Cu、Mg元素的复合添加,所制备的铝合金棒材具有优异的抗压蠕变性能并同时具备良好的导电性能。

The aluminum alloy cable connection fitting has high requirements on the compressive creep property and electrical conductivity of the material With the horizontal hot top die semi-continuous casting process and the extrusion process, the effects of Fe, Cu, Zr, Mg elements on the properties of the bars for aluminum alloy cable connection fittings were investigated by mechanical property testing, electrical conductivity testing, creep testing and other microscopic testing methods such as metallographic microscope, scanning electron microscope, XRD analysis and energy spectrum analysis. The results show that Zr element can obviously improve the compressive creep property of the material, but the addition of Zr element will worsen the electrical conductivity of the material. Compared with Fe element, the addition of trace Cu element can improved to a certain extent the compressive creep property and the electrical conductivity of the material. Mg element can greatly improve the compressive creep property of the material, especially when Cu and Mg elements are simultaneously added in the alloy, the prepared aluminum alloy bars have excellent compressive creep properties and good electrical conductivity.