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<p>To concurrently optimize the mechanical and damping performance of A356 aluminum alloy, this study prepared A356 aluminum alloys with varying scandium (Sc) contents by the traditional smelting process, and the impacts of Sc addition on the damping capacity were systematically studied. The study demonstrated that incorporating an appropriate amount of Sc significantly refines α-Al grains and the eutectic Si phases in the A356 aluminum alloy. With Sc additions under 0.4 wt.%, the AlSi<sub>2</sub>Sc<sub>2</sub> phases were not detected in the aluminum matrix. In contrast, at a Sc content of 0.6 wt.%, numerous network-like AlSi<sub>2</sub>Sc<sub>2</sub> phases appeared in the matrix. The Sc-containing A356 alloys exhibited superior mechanical properties compared to the A356 alloy. However, upon increasing the Sc content, the mechanical performance of A356 aluminum alloy showed an initial improvement followed by a decline. The damping performance and comprehensive damping performance of the Sc-containing A356 alloys were markedly improved in comparison with those of the A356 aluminum alloy. At a strain of 0.15%, the internal friction values of A356 alloys containing 0.2, 0.4, and 0.6 wt.% Sc were 18%, 48%, and 37% higher than that of the A356 alloy. At around 250&#xa0;°C, compared to the A356 alloy, the internal friction values of A356 alloys containing 0.2, 0.4, and 0.6 wt.% Sc increased by 24%, 66%, and 41%, respectively. Therefore, introducing Sc into A356 aluminum alloy effectively enhances its mechanical and damping properties, increasing its application potential in the automotive industry for vibration and noise reduction.</p>

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Effect of Rare Earth Sc on Microstructure and Damping Capacity of A356 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Kai Huang,
  • Hongjie Jiang,
  • Chongyu Liu,
  • Maomi Zhao,
  • Lili Wei,
  • Shuhui Liu

摘要

To concurrently optimize the mechanical and damping performance of A356 aluminum alloy, this study prepared A356 aluminum alloys with varying scandium (Sc) contents by the traditional smelting process, and the impacts of Sc addition on the damping capacity were systematically studied. The study demonstrated that incorporating an appropriate amount of Sc significantly refines α-Al grains and the eutectic Si phases in the A356 aluminum alloy. With Sc additions under 0.4 wt.%, the AlSi2Sc2 phases were not detected in the aluminum matrix. In contrast, at a Sc content of 0.6 wt.%, numerous network-like AlSi2Sc2 phases appeared in the matrix. The Sc-containing A356 alloys exhibited superior mechanical properties compared to the A356 alloy. However, upon increasing the Sc content, the mechanical performance of A356 aluminum alloy showed an initial improvement followed by a decline. The damping performance and comprehensive damping performance of the Sc-containing A356 alloys were markedly improved in comparison with those of the A356 aluminum alloy. At a strain of 0.15%, the internal friction values of A356 alloys containing 0.2, 0.4, and 0.6 wt.% Sc were 18%, 48%, and 37% higher than that of the A356 alloy. At around 250 °C, compared to the A356 alloy, the internal friction values of A356 alloys containing 0.2, 0.4, and 0.6 wt.% Sc increased by 24%, 66%, and 41%, respectively. Therefore, introducing Sc into A356 aluminum alloy effectively enhances its mechanical and damping properties, increasing its application potential in the automotive industry for vibration and noise reduction.