Research On Aluminum Alloy Cable Conductor Materials

With its comprehensive performance and economic advantages,aluminum alloys have become a trend to replace copper conductors.However,during the service process of aluminum alloy cables,frequent power-on and power-off causes stress relaxation at the interface as the operating time increases,resulting in a vicious cycle of increased contact resistance and increased temperature,which poses serious safety risks.In this paper,industrial pure aluminum and Al-Mg-Si alloys are taken as the research object,and 8030 aluminum alloy is used as the reference object.The analysis methods such as tensile strength,yield strength,electrical conductivity,and creep properties are used to study the OM and SEM The effects of annealing process and alloy elements on the strength,plasticity and electrical conductivity of aluminum alloys,and an annealing process with improved creep resistance and high creep resistance aluminum alloys were obtained.The creep properties of Al-Mg-Si alloy,industrial pure aluminum and 8030 aluminum alloy at 120℃ and 15～35MPa were compared and analyzed,and the creep mechanism of the wire under experimental conditions was discussed.The findings are as follows:(1)The two-stage annealing process of low temperature and high temperature can greatly improve the compressive creep performance,electrical conductivity and elongation of aluminum and aluminum alloy wires.(2)The compressive creep performance of the Al-Mg-Si alloy after two-stage annealing is better than that of the normal-processed commercial 8030 aluminum alloy.(3)The creep mechanism of the two-stage annealed Al-Mg-Si alloy and the normally annealed 8030 aluminum alloy at 120℃ and 30-40 MPa is the dislocation slip mechanism.(4)Al-Mg-Si aluminum alloy undergoes two-stage annealing after low temperature and high temperature to eliminate movable dislocations inside the alloy,and Mg and Si atoms dissolved in the aluminum matrix form a dispersedly distributed metastable Mg2Si precipitation phase Pinning dislocations hinder dislocation slip,making the annealed Al-Mg-Si alloy have better creep resistance than 8030.