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The effect of Al-Mg-Si wire rod heat treatment on its resistivity and strength

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Overhead conductors AAAC (All Aluminium Alloy Conductor) are homogenous conductors, which are made of high-strength aluminium alloys Al-Mg-Si. The above constructions are a substitute for the tradition ACSR conductors (Aluminium Core Steel Conductor), which are made of steel and aluminium wires. The superiority of AAAC conductors over ACSR leads to a significant reduction in the weight of the cable (no steel core), no risk of corrosion between steel wires and aluminium wires and the entire cross-section of the conductor is electrically active. The application of curable-precipitation alloys in this application allows obtaining on the one hand wires with high electrical conductivity and on the other with high tensile strength. The raw material for the production of the Al-Mg-Si wires is wirerod produced in the Continuus Properzi line, which is in the temper T1 (cooled after forming at elevated temperature and after natural aging). The general technologies of shaping mechanical and electrical properties of AlMgSi wirerods consist of two kinds of heat treat-ment: high temperature and low temperature heat treatment.  The high heat treatment includes homogenization process and supersaturation process. Low temperature heat treatment takes place  after supersaturation and includes natural or artificial aging.

This paper presents results of Mg and Si amount influence on the mechanical and electrical properties of EN AW-6101 wire rods after heat treatment. Due to the fact that the general aim of this study was to determine the effect of the material's temper on the mechanical and electrical proper-ties, the research program required taking into account the initial parameters of the starting material researched. These can be modified by means of selecting the chemical composition of the AlMgSi alloy and the value of precipitation hardening obtained by means of artificial aging.

Dr. Beata Smyrak
AGH University of Science and Technology
Additional Authors:
  • Bartosz Jurkiewicz
    AGH University of Science and Technology
  • Małgorzata Zasadzińska
    AGH University of Science and Technology
  • Marek Gniełczyk
    AGH University of Science and Technology