Improving Comprehensive Properties of Aluminum Conductor via Hierarchical Compositions and Microstructures

IF 2.7 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Mechanica Solida Sinica Pub Date : 2025-02-27 DOI:10.1007/s10338-025-00591-y

S. L. Cai, S. Wu, G. Ding, Y. Liu, J. Gu, L. H. Dai, M. Q. Jiang

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Abstract

The development and deployment of aluminum conductor have been significantly hampered by the contradiction of yield strength, uniform elongation, and electrical conductivity. Herein, we successfully fabricated a pure aluminum (Al) clad aluminum alloy (AA) rod with hierarchical compositions and microstructures. The proposed pure Al clad AA rod showcases an optimized combination of yield strength, uniform elongation, and electrical conductivity, i.e., easing the restriction on improving yield strength, uniform elongation, and electrical conductivity. Compared to existing experiments, uniform elongation improved fourfold, while yield strength increased by 13% and electrical conductivity improved by 2% in terms of the international annealed copper standard (IACS). Microstructural characterizations and theoretical analyses revealed that the optimal performance of the Al clad AA arose from low-density low-angle grain boundaries (LAGBs) in the outer Al and high-density LAGBs with nanoscale precipitations in the inner AA. Our findings offer a compelling strategy for fabricating high-performance aluminum conductors, thereby laying a solid technical foundation for their wide application in power delivery systems.

Graphical Abstract

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通过分层成分和微观结构改善铝导体综合性能

屈服强度、均匀伸长率和导电性的矛盾严重阻碍了铝导体的发展和应用。在此，我们成功地制备了具有分层成分和微观结构的纯铝（Al）包覆铝合金（AA）棒。提出的纯铝包覆AA棒展示了屈服强度、均匀伸长率和导电性的优化组合，即减轻了提高屈服强度、均匀伸长率和导电性的限制。与现有实验相比，根据国际退火铜标准（IACS），均匀伸长率提高了4倍，屈服强度提高了13%，电导率提高了2%。显微组织表征和理论分析表明，铝包层AA的最佳性能源于外层Al的低密度低角晶界（LAGBs）和内部AA的高密度低角晶界（LAGBs）。我们的研究结果为制造高性能铝导体提供了一个令人信服的策略，从而为其在电力输送系统中的广泛应用奠定了坚实的技术基础。图形抽象

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来源期刊

Acta Mechanica Solida Sinica 物理-材料科学：综合

CiteScore

3.80

自引率

9.10%

发文量

1088

审稿时长

9 months

期刊介绍： Acta Mechanica Solida Sinica aims to become the best journal of solid mechanics in China and a worldwide well-known one in the field of mechanics, by providing original, perspective and even breakthrough theories and methods for the research on solid mechanics. The Journal is devoted to the publication of research papers in English in all fields of solid-state mechanics and its related disciplines in science, technology and engineering, with a balanced coverage on analytical, experimental, numerical and applied investigations. Articles, Short Communications, Discussions on previously published papers, and invitation-based Reviews are published bimonthly. The maximum length of an article is 30 pages, including equations, figures and tables