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<p>Presently, electromagnetic stir casting has been successfully applied in industrial production. However, the microstructure and property changes on rare-earth magnesium alloys with various Zn contents cast processed by electromagnetic stirring due to heat treatment remains unclear. The Mg-6Gd-3Y-xZn-0.6Zr (X=1, 1.5, 2, 3) alloy was prepared by electromagnetic stirring (EMS) solidification method, and the alloy was treated with solid solution treatment and aging. This process was followed by an analysis focusing on the microstructural evolution and property changes. The chosen solid solution treatment involved water quenching after maintaining the alloy at 520&#xa0;°C for 8 hours. After the solid solution treatment, the second phase redissolved, increasing plasticity. After aging treatment, the age-hardening curve tends to smooth with increased Zn content. The more residual LPSO phase, the less β' phase precipitated by aging. Compared with the as-cast state, the mechanical properties of the alloy are significantly improved by solid solution and aging treatment. The 1.5Zn alloy aged 48 hours exhibited the best performance, achieving strength and elongation values of 213.5 MPa and 9.7%, respectively.</p>

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Effect of Heat Treatment on Microstructure and Properties of Rare-Earth Magnesium Alloys Cast by Electromagnetic Stirring with Different Zn Contents

  • 期刊论文

  • 发表日期：

    2025年8月24日

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  • He Chen,
  • Hong-Mei Chen,
  • Hao Li,
  • Tao Huang,
  • Qian-Hao Zang,
  • Jing Zhang,
  • Di Feng,
  • Yu-Hang Guo

摘要

Presently, electromagnetic stir casting has been successfully applied in industrial production. However, the microstructure and property changes on rare-earth magnesium alloys with various Zn contents cast processed by electromagnetic stirring due to heat treatment remains unclear. The Mg-6Gd-3Y-xZn-0.6Zr (X=1, 1.5, 2, 3) alloy was prepared by electromagnetic stirring (EMS) solidification method, and the alloy was treated with solid solution treatment and aging. This process was followed by an analysis focusing on the microstructural evolution and property changes. The chosen solid solution treatment involved water quenching after maintaining the alloy at 520 °C for 8 hours. After the solid solution treatment, the second phase redissolved, increasing plasticity. After aging treatment, the age-hardening curve tends to smooth with increased Zn content. The more residual LPSO phase, the less β' phase precipitated by aging. Compared with the as-cast state, the mechanical properties of the alloy are significantly improved by solid solution and aging treatment. The 1.5Zn alloy aged 48 hours exhibited the best performance, achieving strength and elongation values of 213.5 MPa and 9.7%, respectively.