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| Effects of Aging on Secondary-phase Precipitation and Properties of High-conductivity Heat-resistant Al Alloy Conductor Wire |
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| DOI：10.7643/issn.1672-9242.2022.06.017 |
| KeyWord:heat-resistant Al alloy conductor wire artificial aging secondary phase conductivity tensile mechanical property fractography |
| Author | Institution |
| FANG Zhen-bang |
Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei , China |
| WANG Ruo-min |
Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei , China;Anhui Xinli Power Technology Consulting Co., Ltd., Hefei , China |
| LI Chen-yu |
School of Materials Science and Engineering, Hefei University of Technology, Hefei , China |
| MIAO Chun-hui |
Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei , China |
| TENG Yue |
Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei , China |
| CHEN Guo-hong |
Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei , China |
| TANG Wen-ming |
School of Materials Science and Engineering, Hefei University of Technology, Hefei , China |
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| Abstract: |
| The precipitation characteristic of the secondary-phases, and the change law of the conductivity and tensile mechanical properties were researched to evaluate the thermal stability of the 61.5% IACS high-conductivity heat-resistant Al alloy conductor wire. After aging at temperature range from 150 ℃ to 230 ℃ for 630 h, the composition, morphology and distribution of the secondary phases was detected, and its effect on the conductivity and tensile mechanical properties of the aging Al alloy conductor wire were revealed. As for aging Al alloy conductor wire, granular and needle-like secondary phases of A13Zr(Y, Er) and A13(Zr(Y)xErl‒x) are distributed in the Al grains and along the Al grain boundaries, and also the Al3Fe particles are distributed dispersively along the Al grain boundaries. During aging, the tensile strength and elongation of the wire initially increase, and then gradually decrease. Meanwhile, the conductivity of the wire initially increases, and then remains stable. Such trends become more obvious as increasing the aging temperature. The evolution of the mechanical properties and conductivity of the aging wire mainly results from the precipitation and growth of the secondary phases. After aging at 230 ℃ for 1 h, the strength retention rate of the Al alloy conductor wire is as high as 94%, meeting the requirement of GB/T 30551‒2014. The conductivity of the wire in all aging conditions is superior to the initial value of the wire. Therefore, it is indicated that the high-conductivity heat-resistant Al alloy conductor wire has a high thermal stability. |
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