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<p>This study examines the influence of Si element on the mechanical properties of cast Al–xSi and Al–xSi–5Fe alloys, where Si contents at 0, 7.5, 12.6, and 15% are added, i.e., both hypo- and hypereutectic compositions. In hypoeutectic Al–7.5Si alloys, eutectic Si is formed around <i>α</i>–Al phase, while, in hypereutectic Al–15Si alloys, plate-like eutectic and coarsening of primary Si phases are created. In hypoeutectic Al–7.5Si with 5%Fe addition (Al–7.5Si–5Fe), enlarged and plate-shaped <i>β</i>–Al<sub>5</sub>FeSi are created, while refined <i>β</i>–Al<sub>5</sub>FeSi and primary Si phases are detected in Al–15Si–5Fe alloy. Such change of eutectic structures is attributed to the mechanical properties. The ultimate tensile strength (UTS) of Al–xSi alloys increases to more than twice that of pure Al. However, the UTS of the hypereutectic Al–15Si alloy remained comparable to that of the hypoeutectic Al–xSi alloys despite the differences in microstructure. This behavior may be explained by two competing effects. In the Al–15Si alloy, refinement of the eutectic Si phase enhances the UTS, whereas an increased amount of primary Si reduces it, resulting in a net negligible change in UTS. On the contrary, the UTS of Al–xSi–5Fe alloys decreases with increasing Si content up to 12.5%, whereas it increases for the Al–15Si–5Fe alloy. This occurrence is attributed to the refinement of the β–Al<sub>5</sub>FeSi phase. The mechanical properties of both Al–Si and Al–Si–Fe alloys were systematically investigated in the present study.</p>

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Effect of Si Content on the Mechanical Properties of Cast Al–xSi and Al–xSi–5Fe Alloys

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Mitsuhiro Okayasu,
  • Hiroya Nakamura,
  • Shuhei Takeuchi

摘要

This study examines the influence of Si element on the mechanical properties of cast Al–xSi and Al–xSi–5Fe alloys, where Si contents at 0, 7.5, 12.6, and 15% are added, i.e., both hypo- and hypereutectic compositions. In hypoeutectic Al–7.5Si alloys, eutectic Si is formed around α–Al phase, while, in hypereutectic Al–15Si alloys, plate-like eutectic and coarsening of primary Si phases are created. In hypoeutectic Al–7.5Si with 5%Fe addition (Al–7.5Si–5Fe), enlarged and plate-shaped β–Al5FeSi are created, while refined β–Al5FeSi and primary Si phases are detected in Al–15Si–5Fe alloy. Such change of eutectic structures is attributed to the mechanical properties. The ultimate tensile strength (UTS) of Al–xSi alloys increases to more than twice that of pure Al. However, the UTS of the hypereutectic Al–15Si alloy remained comparable to that of the hypoeutectic Al–xSi alloys despite the differences in microstructure. This behavior may be explained by two competing effects. In the Al–15Si alloy, refinement of the eutectic Si phase enhances the UTS, whereas an increased amount of primary Si reduces it, resulting in a net negligible change in UTS. On the contrary, the UTS of Al–xSi–5Fe alloys decreases with increasing Si content up to 12.5%, whereas it increases for the Al–15Si–5Fe alloy. This occurrence is attributed to the refinement of the β–Al5FeSi phase. The mechanical properties of both Al–Si and Al–Si–Fe alloys were systematically investigated in the present study.