Abstract: Taking Al-Mg-Si alloy wire as the research subject, the influence of electrothermal treatment on the properties and microstructure of aluminum-magnesium-silicon alloy wire was systematically explored by implementing two processes:traditional annealing heat treatment and electrothermal treatment. The results show that the tensile strength of the as-drawn alloy wire decreases significantly after annealing at 160 ℃, while the electrical conductivity increases significantly. Compared with annealing heat treatment, the strength of the alloy wire in the electric-heated state is lower and the electrical conductivity is higher. The relationship between strength and electrical conductivity remains mutually trade-off. Heat treatment causes the growth of radial grain, recovery of dislocations and coarsening of precipitates of the Al-Mg-Si alloy wire. Furthermore, electric-heat treatment accelerates the coarsening process of the precipitates. The increase in radial grain size, decrease of dislocation density and coar-sening of precipitates are the key factors in the decrease in strength and the increase in electrical conductivity of the alloy wire after heat treatment. In particular, the local Joule heat generated near the precipitates during the electric-heat treatment process is not only the mechanism of electrothermal damage in the Al-Mg-Si alloy wire but also the main reason for its lower strength than that in the annealed-treated state.
顾建, 李冬青, 刘胜春, 司佳钧. 高强铝镁硅合金线电致热影响规律及机制研究[J]. 材料导报, 2025, 39(23): 24100236-6.
GU Jian, LI Dongqing, LIU Shengchun, SI Jiajun. Study on the Influence of Electrothermal Effect on High-strength Al-Mg-Si Alloy Wire. Materials Reports, 2025, 39(23): 24100236-6.
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2025, Vol. 39 
