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<p>An array of five Al–7Si–1.2Cu–0.35Mg–0.15Ti–0.24Zr–0.05Sr–xZn alloys with distinctive Zn contents were synthesized to explore the impacts of variable Zn quantities on the microstructural features and mechanical attributes of the alloys. Post the addition of a designated amount of Zn, the α-Al and eutectic Si phases within these alloys underwent refinement. Our investigation unveiled that an apt Zn content facilitated a more uniform dispersal of the θ-Al<sub>2</sub>Cu phase within the matrix, mitigating the congregation of θ-Al<sub>2</sub>Cu phase, thereby averting focal stress accumulations. The clustering of Zn-enriched phases within the eutectic Si phase not only restrained the exorbitant development of the eutectic Si, but also contributed to its refinement, substantially augmenting the alloy’s strength and ductility, and significantly elevating its mechanical capabilities. The alloy reached peak performance upon the inclusion of 0.9% Zn, manifesting an ultimate tensile strength of 246.2&#xa0;MPa, a 6% elevation from the alloy devoid of Zn augmentation; a yield strength of 139.3&#xa0;MPa, a 5.5% enhancement; and a percent elongation of 7.4%, representing a striking 27.6% improvement.</p>

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Effect of Zn Addition on Microstructure and Mechanical Properties of a Hypoeutectic Al–7Si-Based Alloy

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Jinlong Kong,
  • Linbo An,
  • Jiale Zheng,
  • Xiaodong Du

摘要

An array of five Al–7Si–1.2Cu–0.35Mg–0.15Ti–0.24Zr–0.05Sr–xZn alloys with distinctive Zn contents were synthesized to explore the impacts of variable Zn quantities on the microstructural features and mechanical attributes of the alloys. Post the addition of a designated amount of Zn, the α-Al and eutectic Si phases within these alloys underwent refinement. Our investigation unveiled that an apt Zn content facilitated a more uniform dispersal of the θ-Al2Cu phase within the matrix, mitigating the congregation of θ-Al2Cu phase, thereby averting focal stress accumulations. The clustering of Zn-enriched phases within the eutectic Si phase not only restrained the exorbitant development of the eutectic Si, but also contributed to its refinement, substantially augmenting the alloy’s strength and ductility, and significantly elevating its mechanical capabilities. The alloy reached peak performance upon the inclusion of 0.9% Zn, manifesting an ultimate tensile strength of 246.2 MPa, a 6% elevation from the alloy devoid of Zn augmentation; a yield strength of 139.3 MPa, a 5.5% enhancement; and a percent elongation of 7.4%, representing a striking 27.6% improvement.