Evolution law and mechanisms of electrical conductivity of Al-Mg-Si alloy wire

doi:10.13251/j.issn.0254-6051.2021.03.035

Abstract

Abstract: Thermal service environment of Al-Mg-Si alloy wire used for overhead transmission lines was simulated by annealing at different temperatures, the evolution law and mechanisms of electrical conductivity of the Al-Mg-Si alloy wire annealed at different temperatures were investigated. The results show that the electrical conductivity increasing of the annealed Al-Mg-Si alloy wire could be divided into three stages with the increase of annealing temperature. In the first stage (temperature ranges from 90 ℃ to 150 ℃), the electrical conductivity increases slightly, which is caused by the defect recovery. In the second stage (temperature ranges from 150 ℃ to 200 ℃), the growth of precipitates and the precipitation of solid solution atoms lead to the rapid increase of the electrical conductivity. In the third stage (temperature ranges from 200 ℃ to 300 ℃), the grain growth is the main reason for the slow increase of the electrical conductivity.

Key words: Al-Mg-Si alloy wire, annealing treatment, electrical conductivity, grain growth, precipitates

CLC Number:

TG166.3

Chen Qingyin, Sheng Yehong, Li Rui, Hou Jiapeng, Wang Qiang, Zhang Zhefeng. Evolution law and mechanisms of electrical conductivity of Al-Mg-Si alloy wire[J]. Heat Treatment of Metals, 2021, 46(3): 175-179.

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