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Xingqun He, Huadong Fu, and Jianxin Xie, Microstructure and properties evolution of in-situ fiber-reinforced Ag–Cu–Ni–Ce alloy during deformation and heat treatment, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-022-2412-9
Cite this article as:
Xingqun He, Huadong Fu, and Jianxin Xie, Microstructure and properties evolution of in-situ fiber-reinforced Ag–Cu–Ni–Ce alloy during deformation and heat treatment, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-022-2412-9
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研究论文

原位复合纤维强化AgCuNiCe合金制备过程的组织性能演变

  • 通讯作者:

    谢建新    E-mail: jxxie@mater.ustb.edu.cn

文章亮点

  • (1)采用大变形量轧制/拉拔和热处理实现了原位复合纤维强化银合金线材的制备。
  • (2)明确了原位复合纤维强化合金制备过程的组织性能演变规律。
  • (3)实现了Ag–11.40Cu–0.66Ni–0.05Ce合金强度和导电性能的同时提升。
  • 银合金是重要的低压和中压电接触材料,力学与导电性能的协同调控一直是银合金电接触材料领域的关键挑战和重点发展方向。本文提出了采用原位复合纤维强化方式调控Ag–11.40Cu–0.66Ni–0.05Ce (质量分数)合金力学与导电性能的思路,明确了原位复合纤维强化合金制备过程的组织性能演变规律。采用场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)和电子背散射衍射(EBSD)对不同变形阶段的微观组织进行了观察。研究结果表明,本文提出的方法可以实现原位复合纤维强化Ag–Cu–Ni–Ce合金的制备。大变形量拉拔后,纤维直径约为100–200 nm,合金室温硬度由铸态的HV 81.6提升到HV 169.3,导电率由铸态的74.3% IACS提升到78.6% IACS。随着变形量的增加,合金表现出两种不同的强化机制,电导率显示出三个阶段的变化速率。相关研究通过原位复合纤维强化机制的引入,实现了银合金电接触材料强度和导电性能的同时提升,为制备高性能银合金电接触材料提供了新的思路。
  • Research Article

    Microstructure and properties evolution of in-situ fiber-reinforced Ag–Cu–Ni–Ce alloy during deformation and heat treatment

    + Author Affiliations
    • Silver-based alloys are significant light-load electrical contact materials (ECMs). The trade-off between mechanical properties and electrical conductivity is always an important issue for the development of silver-based ECMs. In this paper, we proposed an idea for the regulation of the mechanical properties and the electrical conductivity of Ag–11.40Cu–0.66Ni–0.05Ce (wt%) alloy using in-situ composite fiber-reinforcement. The alloy was processed using rolling, heat treatment, and heavy drawing, the strength and electrical conductivity were tested at different deformation stages, and the microstructures during deformation were observed using field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). The results show that the method proposed in this paper can achieve the preparation of in-situ composite fiber-reinforced Ag–Cu–Ni–Ce alloys. After the heavy deformation drawing, the room temperature Vickers hardness of the as-cast alloy increased from HV 81.6 to HV 169.3, and the electrical conductivity improved from 74.3% IACS (IACS i.e., international annealed copper standard) to 78.6% IACS. As the deformation increases, the alloy strength displays two different strengthening mechanisms, and the electrical conductivity has three stages of change. This research provides a new idea for the comprehensive performance control of high-performance silver-based ECMs.
    • The authors declare no conflict of interest.
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