Al-Si-Mg-Fe-Cu conductive alloy rod and preparation method thereof

Abstract

The invention belongs to the technical field of metal materials, and particularly relates to an Al-Si-Mg-Fe-Cu conductive alloy rod and a preparation method thereof. The conductive alloy rod is composed of, by weight percentage, 3.8-4.0% of silicon, 0.5-0.8% of magnesium, 0.1-0.3% of ferrum, 0.08-0.1% of copper, 0.05-0.1% of boron, 0.01-0.04% of strontium, and the balance aluminium. According to the preparation method, the boron and the strontium are added to carried out boronization and modification composite treatment in the alloy smelting process, a casting is formed through casting, the particle size and distribution of second phases of eutectic silicon, AlFeSi and Mg2Si are changed by means of extrusion deformation, solid solution and aging heat treatment, so that the second phases are in fine particles and distributed in a dispersed mode. The conductive alloy rod has excellent mechanical properties and good conductivity, and is low in cost, simple in process and high in yield.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to an Al-Si-Mg-Fe-Cu conductive alloy rod and a preparation method thereof. Background technique [0002] Aluminum alloy conductive material is one of the important basic materials in electrical industry. Aluminum and aluminum alloys have the advantages of low density, high specific strength, and good electrical and thermal conductivity, and are widely used in automobile manufacturing, aerospace and other fields. In recent years, with the development of the electrical and electrical industry, aluminum and aluminum alloys have been increasingly used in wire and cable, electrical switches and other fields to replace copper and copper alloy conductors that are currently widely used. From the perspective of national resource strategy, expanding the application range of aluminum alloy conductive materials in wire and cable products, "using aluminum to save copper" ha...

AI Technical Summary

Problems solved by technology

However, hypoeutectic Al-Si alloy has poor balance between electrical conductivity and mechanical properties, and it is difficult to meet the performance requirements of overhead transmission lines at the same time, which has become a bottleneck problem that limits its popularization and application.

[0004] Chinese patent CN103397226A discloses an aluminum alloy rod material containing Al, Si, Mg, Fe, Cu, Zn and B. The conductivity of the alloy is only 59.5%-60%, and there is no mention of the mechanical properties of the material

[0005] In the prior art, the content of the constituent elements of the conductive aluminum alloy is low, and the strength of the obtained aluminum alloy rod is not high, which belongs to the medium-strength aluminum alloy, and the scrap rate is high, and the main reason for the scrap is due to the technical performance of the medium-strength aluminum alloy rod Fluctuations cause disconnection, and electrical performance fluctuations cause resistivity to exceed the standard. Such a high scrap rate not only reduces the production efficiency of medium-strength aluminum alloy rods, but also increases the production cost of medium-strength aluminum alloy rods.

Under normal conditions, keeping the content of the constituent elements of the alloy at a low level can ensure that its electrical conductivity meets the requirements for use, but it is difficult to greatly improve the mechanical properties; increasing the content of the constituent elements of the aluminum alloy will easily lead to a rapid decrease in the conductivity of the aluminum alloy, thereby It is difficult to meet the purpose of aluminum alloys to effectively transmit current and increase power loss. Therefore, the matching of conductivity and mechanical properties of aluminum alloys has become a bottleneck problem that limits the development of aluminum alloy rods.

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