Effect of isothermal annealing on microstructure and properties of 8030 aluminum alloy wire

doi:10.13251/j.issn.0254-6051.2020.02.030

Abstract

Abstract:

Effects of different isothermal annealing processes on the microstructure and properties of 8030 aluminum alloy wire were studied. The results show that the aluminum alloy wires are both composed of α-Al matrix and Al₆Fe phase before and after the isothermal annealing. After the isothermal annealing, at the same isothermal temperature, the microstructure gradually becomes uniform with the extension of the isothermal time. Under the same isothermal time, as the isothermal temperature increases, the isothermal time at which the structure tends to be uniform is shortened. After isothermal annealing, the electrical conductivity of aluminum alloy wires is improved. After uniform annealing at 470 ℃ for 24 h and then at 240 ℃ for 4 h, the electrical conductivity of the alloy reaches the highest value of 57.21%IACS, which is 2.4%IACS higher than that of the untreated samples. After the isothermal annealing, the hardness and tensile strength of the aluminum alloy wire are reduced, but the plasticity is greatly improved. After annealing at 470 ℃ for 24 h and then isothermal treated at 260 ℃ for 8 h, the elongation of the alloy is up to 23.64 %. Before and after heat treatment, the alloys before and after heat treatment are both plastic fracture.

Key words: 8030 aluminum alloy, isothermal annealing treatment, microstructure, electrical conductivity, mechanical properties

CLC Number:

TG156.2

Han Xi, Li Ying, Pang Hua, Li Chun, Cui Le, Wang Jinli, Liu Yanfeng. Effect of isothermal annealing on microstructure and properties of 8030 aluminum alloy wire[J]. HTM, 2020, 45(2): 154-160.

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