Al-0.7Fe-0.1Si系铝合金导线成分优化及组织性能的研究
发布时间：2018-07-14 09:18
【摘要】：8xxx系铝合金导线具有较好的导电能力与力学性能,以及优良的应用价值,已经广泛地应用于电线电缆的输电线路中,对于8xxx系铝合金的研究也已经越来越重要,本文以导电线缆8076铝合金导体为研究基础,通过对合金成分设计、成形及热处理工艺的研究,拟研发出一种微合金化的8xxx合金线材。为了进一步提高合金的导电能力,研究了添加稀土元素Er对合金的组织与性能的影响,在添加Er元素含量不变的情况下,增加Mg元素的含量,进一步探求合金的组织与性能的变化;本次实验研究不同拉拔工艺对合金导线的组织和性能的影响,进而确定最优的拉拔变形工艺;同时深入研究了热处理工艺对合金线材组织和性能的影响,确定合理的热处理工艺制度。添加稀土元素Er的结果表明,当合金中加入稀土元素Er时,Er元素会与基体作用析出Al3Er第二相粒子,会细化合金的组织,提高合金的电学性能,但是对合金的力学性能影响不大,不能实现合金力学性能与电学性能兼得的效果,所以在保持Er元素含量不变时,增加Mg元素含量,结果表明,增加Mg元素含量后,会与基体中的其他合金元素析出化合物,弥散强化合金,使合金的力学性能提高,而对电学性能影响甚微,此时合金的电学性能与力学性能均能达到国家导体材料的性能标准。拉拔工艺表明,最佳的拉拔工艺为:Φ6.40mm/330℃经中间退火的拉拔导线,电导率达61.34%IACS,抗拉强度为270.92MPa,伸长率为10.02%,退火工艺研究表明:冷拔导线经330℃退火5h,随炉冷却,电导率将达到最大值61.88%IACS,此时的抗拉强度为280.56MPa,伸长率为10.36%;而且线材退火后的冷却方式对合金的性能也有一定的影响,结果表明,随炉冷却的方式要比空冷的冷却方式,性能优良。固溶温度和时效工艺不同获得的导线性能也不同,双级时效较单级时效的电导率和伸长率有明显提高;冷拔导线经480℃×1h水淬+180℃×10h时效+100℃×12h时效,线材的性能最大,电导率为60.16%IACS,抗拉强度为204.32MPa,伸长率为13.21%,且双级时效处理较单级时效,电导率和伸长率有提高,抗拉强度变化不大。
[Abstract]:8xxx aluminum alloy conductors have good electrical conductivity, mechanical properties and excellent application value. They have been widely used in transmission lines of wire and cable, and the study of aluminum alloy in 8xxx system has become more and more important. On the basis of conducting cable 8076 aluminum alloy conductor, a microalloyed 8xxx alloy wire was developed through the study of alloy composition design, forming and heat treatment process. In order to further improve the electrical conductivity of the alloy, the effect of the addition of rare earth element er on the microstructure and properties of the alloy was studied. When the content of er element was constant, the content of mg element was increased. The effects of different drawing processes on the microstructure and properties of alloy conductors were studied in this experiment, and the optimal drawing deformation process was determined. At the same time, the effect of heat treatment on the microstructure and properties of alloy wire was studied, and the reasonable heat treatment process was determined. The results of adding rare earth element er show that when the rare earth element er is added to the alloy, the second phase Al _ 3er particles will be precipitated by the addition of er, which will refine the microstructure of the alloy and improve the electrical properties of the alloy, but it has little effect on the mechanical properties of the alloy. The mechanical and electrical properties of the alloy can not be achieved, so the content of mg is increased when the content of er is kept constant. The results show that when the content of mg is increased, the compound can be precipitated from other alloy elements in the matrix. The mechanical properties of the alloys are improved by dispersion strengthening, but the effect on the electrical properties is little. At this time, both the electrical and mechanical properties of the alloys can meet the performance standards of the national conductor materials. The results show that the optimum drawing process is: the drawing wire annealed at 桅 6.40mm/330 鈩，
本文编号：2121188
[Abstract]:8xxx aluminum alloy conductors have good electrical conductivity, mechanical properties and excellent application value. They have been widely used in transmission lines of wire and cable, and the study of aluminum alloy in 8xxx system has become more and more important. On the basis of conducting cable 8076 aluminum alloy conductor, a microalloyed 8xxx alloy wire was developed through the study of alloy composition design, forming and heat treatment process. In order to further improve the electrical conductivity of the alloy, the effect of the addition of rare earth element er on the microstructure and properties of the alloy was studied. When the content of er element was constant, the content of mg element was increased. The effects of different drawing processes on the microstructure and properties of alloy conductors were studied in this experiment, and the optimal drawing deformation process was determined. At the same time, the effect of heat treatment on the microstructure and properties of alloy wire was studied, and the reasonable heat treatment process was determined. The results of adding rare earth element er show that when the rare earth element er is added to the alloy, the second phase Al _ 3er particles will be precipitated by the addition of er, which will refine the microstructure of the alloy and improve the electrical properties of the alloy, but it has little effect on the mechanical properties of the alloy. The mechanical and electrical properties of the alloy can not be achieved, so the content of mg is increased when the content of er is kept constant. The results show that when the content of mg is increased, the compound can be precipitated from other alloy elements in the matrix. The mechanical properties of the alloys are improved by dispersion strengthening, but the effect on the electrical properties is little. At this time, both the electrical and mechanical properties of the alloys can meet the performance standards of the national conductor materials. The results show that the optimum drawing process is: the drawing wire annealed at 桅 6.40mm/330 鈩，
本文编号：2121188
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