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摘要
Aiming at a domestic 61.5%IACS high-conductivity heat-resistant aluminum alloy wire, artificial aging at 150-200℃ and low cycle fatigue test of 5000 stress cycles were carried out. The variation law of mechanical properties of the aluminum alloy wire was discussed by tensile mechanical property test and fracture analysis, and its service reliability was evaluated. The results show that the aging of the aluminum alloy wire strand has experienced three stages: under aging, peak aging and over aging. In the under aging and peak aging stages, the strength of the aluminum alloy wire strand increases, while in the over aging stage, the strength decreases, but the plastic change is not obvious in the whole aging stage. During low-cycle fatigue test, the cyclic hardening effect of the aged aluminum alloy wire strand is obvious, its total strain range decreases with the increase of the number of stress cycles, and tends to be stable after 2000 stress cycles. The precipitation and growth of the second phase is the key factor affecting the thermal stability and fatigue properties of the aged aluminum alloy wire strand. Even so, after artificial aging and low cycle fatigue, the strength of the aluminum alloy wire strand remains more than 90% of the original strength, the fracture characteristics of dimple aggregation remain unchanged, and the service reliability is excellent. ? 2022, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.
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