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<p>The trade-off between electrical conductivity and strength in conductor alloys has always been an unavoidable dilemma, based on which, Ce (0, 0.1, 0.3 and 0.6&#xa0;wt&#xa0;%) has been added to the Al-0.8Mg-0.5Si alloy, and an effective heat treatment process has been applied to obtain high-strength, high electrical conductivity alloys. The addition of Ce reduces the solubility of Si and Fe in α-Al, thereby enhancing electrical conductivity. Additionally, CeAlSi<sub>2</sub> phases in the form of dots or rods are formed in the alloy, reducing grain size and improving strength. However, excessive Ce atoms can lead to a “ring-like” phenomenon, which reduces the space between the second phases, increases electron scattering and results in a decrease in electrical conductivity. When the Ce content is 0.3&#xa0;wt.%, the alloy exhibits optimal comprehensive performance. After secondary aging, the electrical conductivity is 51.03 ± 0.15% IACS. The ultimate tensile strength of the alloy is 292&#xa0;MPa, and the yield strength is 271&#xa0;MPa.</p>

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Effect of Cerium on Electrical Conductivity and Mechanical Properties of Al-Mg-Si Alloy

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Wenjun Xu,
  • Xiaodan Zhao,
  • Xutong Wang,
  • Yao Liu,
  • Wenxin Hu,
  • Yanling Guo,
  • Guangxin Wu

摘要

The trade-off between electrical conductivity and strength in conductor alloys has always been an unavoidable dilemma, based on which, Ce (0, 0.1, 0.3 and 0.6 wt %) has been added to the Al-0.8Mg-0.5Si alloy, and an effective heat treatment process has been applied to obtain high-strength, high electrical conductivity alloys. The addition of Ce reduces the solubility of Si and Fe in α-Al, thereby enhancing electrical conductivity. Additionally, CeAlSi2 phases in the form of dots or rods are formed in the alloy, reducing grain size and improving strength. However, excessive Ce atoms can lead to a “ring-like” phenomenon, which reduces the space between the second phases, increases electron scattering and results in a decrease in electrical conductivity. When the Ce content is 0.3 wt.%, the alloy exhibits optimal comprehensive performance. After secondary aging, the electrical conductivity is 51.03 ± 0.15% IACS. The ultimate tensile strength of the alloy is 292 MPa, and the yield strength is 271 MPa.