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Open AccessArticle

Role of Multi-Scale Microstructure in the Degradation of Al Wire for Power Transmission

1
National Quality Supervision & Inspection Center of Electrical Equipment Safety Performance, Zhejiang Huadian Equipment Testing Institute, Hangzhou 310015, China
2
Laboratory of fatigue and fracture for materials, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
3
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(7), 2234; https://doi.org/10.3390/app10072234
Received: 10 March 2020 / Revised: 19 March 2020 / Accepted: 23 March 2020 / Published: 25 March 2020
(This article belongs to the Special Issue Microstructural and Mechanical Properties of Metallic Materials)
As common conductive materials, Al wires are used on overhead transmission lines under long-term heating conditions. In this study, the strength degradation behavior and the strength-electrical conductivity relation of the commercially pure Al wires (CPAWs) and the Al-Fe wires (AFWs) annealed at various temperatures were investigated based on the microstructure evolution. The strength degradation rate of the AFW is always higher than that of the CPAW. A linear trade-off relation between strength and electrical conductivity for the annealed Al wires are clarified. The results reveal that the mechanisms behind the trade-off relation between the strength and the electrical conductivity for the annealed CPAWs and the annealed AFWs are the recovery of dislocations and the obvious increase of grain width, which leads to the decrease of strength and the increase of electrical conductivity. The coalescence of precipitate in the AFW leads to the obvious decrease of strength, which results in the higher strength degradation rate for the AFW as compared with that for the CPAW. Consequently, the principle of microstructure design for anti-degradation of Al wire is presented. View Full-Text
Keywords: commercially pure Al wire; Al-Fe wire; strength degradation; electrical conductivity; annealing treatment commercially pure Al wire; Al-Fe wire; strength degradation; electrical conductivity; annealing treatment
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MDPI and ACS Style

Li, R.; Liu, H.; Ma, H.; Hou, J.; Qian, L.; Wang, Q.; Li, X.; Zhang, Z. Role of Multi-Scale Microstructure in the Degradation of Al Wire for Power Transmission. Appl. Sci. 2020, 10, 2234.

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