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<p>In order to decrease the segregation of Al–Sn alloy and enhance its performance, this study adds Sc as a microalloying element and explores the influence of different Sc contents on the microstructure and properties of as-cast Al–Sn alloy. It was found that with the increase of Sc element content, the Sn phase grains were refined, with the average grain size decreasing from 13.39 to 7.42&#xa0;μm, a decrease of 44.59%. The segregation of the Sn phase was improved and dispersed. When the Sc content was 0.2%, The shape of tin-phase grains changes from irregular to filamentary and elliptical. In the range of Sc content [0, 0.2], the alloy hardness and corrosion resistance showed an increasing trend. When the Sc content was 0.2%, the hardness reached 68.2&#xa0;HV, an increase of 129.6% compared to without adding Sc, and the average coefficient of friction reduced from 0.614 to 0.53. The wear mass decreased by 53.6%, and the wear volume decreased to 0.18355&#xa0;mm<sup>3</sup>, a reduction of 55.01%. The wear performance has been significantly improved. Electrochemical corrosion experiments showed that the addition of Sc shifted the Tafel polarization curve of the corrosion potential in the positive direction. When the Sc content was 0.2%, the corrosion current was the smallest, the impedance was the largest, and the corrosion resistance was the best.</p>

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Effect of Rare Earth Scandium on the Microstructure, Hardness, Friction and Corrosion Properties of Al-9Sn Alloy

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Jiang Zhang,
  • Zhi-Bin Yang,
  • Zhi-Xiang Li,
  • Jiang Chang,
  • Xiao-Ting Ju,
  • Jie Huang,
  • Jun-Feng Li

摘要

In order to decrease the segregation of Al–Sn alloy and enhance its performance, this study adds Sc as a microalloying element and explores the influence of different Sc contents on the microstructure and properties of as-cast Al–Sn alloy. It was found that with the increase of Sc element content, the Sn phase grains were refined, with the average grain size decreasing from 13.39 to 7.42 μm, a decrease of 44.59%. The segregation of the Sn phase was improved and dispersed. When the Sc content was 0.2%, The shape of tin-phase grains changes from irregular to filamentary and elliptical. In the range of Sc content [0, 0.2], the alloy hardness and corrosion resistance showed an increasing trend. When the Sc content was 0.2%, the hardness reached 68.2 HV, an increase of 129.6% compared to without adding Sc, and the average coefficient of friction reduced from 0.614 to 0.53. The wear mass decreased by 53.6%, and the wear volume decreased to 0.18355 mm3, a reduction of 55.01%. The wear performance has been significantly improved. Electrochemical corrosion experiments showed that the addition of Sc shifted the Tafel polarization curve of the corrosion potential in the positive direction. When the Sc content was 0.2%, the corrosion current was the smallest, the impedance was the largest, and the corrosion resistance was the best.