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<p>Herein, Al-Zn-Mg-Cu alloys with different Zn contents were designed to investigate. The microstructural evolution of 0Zn and 5.5Zn alloys during solidification, casting, and homogenization was examined, along with the effect of residual eutectic phases on mechanical properties after homogenization. The results show that the addition of Zn increases the solidification temperature range of the alloy by 29.59&#xa0;°C. In addition, the non-equilibrium phase in as-cast 5.5Zn alloys was identified as the Mg(Zn, Cu, Al)<sub>2</sub> phase. After homogenization, the Mg(Zn, Cu, Al)<sub>2</sub> phase was transformed into the <i>S</i>(Al<sub>2</sub>CuMg) phase; this phase then served as the primary crack initiation and propagation site during tensile testing. It is worth noting that in the 0Zn alloy, the lamellar <i>S</i>(Al<sub>2</sub>CuMg) phase promoted continuous crack propagation; in the 5.5Zn alloy, the discontinuous distribution of <i>S</i>(Al<sub>2</sub>CuMg) phase at grain boundaries led to more crack initiation and shortened the path of micro-crack propagation, resulting in a decrease in elongation.</p>

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Effect of Zn Addition on Microstructure and Mechanical Properties of Aluminum Alloys

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Yunxiang Zhang,
  • Rensong Huang,
  • Peng Sun,
  • Shanju Zheng,
  • Yawei Peng,
  • Mengnie Li

摘要

Herein, Al-Zn-Mg-Cu alloys with different Zn contents were designed to investigate. The microstructural evolution of 0Zn and 5.5Zn alloys during solidification, casting, and homogenization was examined, along with the effect of residual eutectic phases on mechanical properties after homogenization. The results show that the addition of Zn increases the solidification temperature range of the alloy by 29.59 °C. In addition, the non-equilibrium phase in as-cast 5.5Zn alloys was identified as the Mg(Zn, Cu, Al)2 phase. After homogenization, the Mg(Zn, Cu, Al)2 phase was transformed into the S(Al2CuMg) phase; this phase then served as the primary crack initiation and propagation site during tensile testing. It is worth noting that in the 0Zn alloy, the lamellar S(Al2CuMg) phase promoted continuous crack propagation; in the 5.5Zn alloy, the discontinuous distribution of S(Al2CuMg) phase at grain boundaries led to more crack initiation and shortened the path of micro-crack propagation, resulting in a decrease in elongation.