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<p>Though the icosahedral quasicrystal phase found in the Mg–Zn–Y alloy exhibits some prominent features, the large potential difference between it and α-Mg matrix limited the improvement of corrosion resistance. Two quasicrystal-reinforced Mg–12Zn–Y (MG) and Mg–12Zn–0.5Y–0.5Gd (MG0.5) alloys were designed and prepared by rheo-squeezing casting (RSC). The roles of Gd addition and RSC process on the microstructure evolution and corrosion resistance were systematically examined. After the replacement of 0.5&#xa0;wt.% Y with 0.5&#xa0;wt.% Gd, the lamellar eutectic structure spacing became smaller, and the I-phase was refined. With the RSC process, the morphology of I-phase was transformed from a large area of lamellar eutectic structure to a thin strip or dot shape. Besides, the solid solubility of Zn in the α-Mg matrix increased, as well as the Mg<sub>7</sub>Zn<sub>3</sub> phase decreased and even disappeared, which resulted in a significant reduction of the potential difference between the second phase and the α-Mg matrix. The MG0.5 alloy fabricated by the RSC process exhibited the optimal corrosion resistance, with its corrosion current density reduced by 64.4% compared with that of the as-cast MG alloy.</p>

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Enhancing Corrosion Properties of Mg–Zn–Y–Gd Alloys via Gd Microalloying and Rheo-Squeeze Casting

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Di Zhang,
  • Qing Li,
  • Dechao Wu,
  • Shifeng Luo,
  • Yong Ma,
  • Youwen Yang,
  • Yong Su,
  • Xiaogang Fang

摘要

Though the icosahedral quasicrystal phase found in the Mg–Zn–Y alloy exhibits some prominent features, the large potential difference between it and α-Mg matrix limited the improvement of corrosion resistance. Two quasicrystal-reinforced Mg–12Zn–Y (MG) and Mg–12Zn–0.5Y–0.5Gd (MG0.5) alloys were designed and prepared by rheo-squeezing casting (RSC). The roles of Gd addition and RSC process on the microstructure evolution and corrosion resistance were systematically examined. After the replacement of 0.5 wt.% Y with 0.5 wt.% Gd, the lamellar eutectic structure spacing became smaller, and the I-phase was refined. With the RSC process, the morphology of I-phase was transformed from a large area of lamellar eutectic structure to a thin strip or dot shape. Besides, the solid solubility of Zn in the α-Mg matrix increased, as well as the Mg7Zn3 phase decreased and even disappeared, which resulted in a significant reduction of the potential difference between the second phase and the α-Mg matrix. The MG0.5 alloy fabricated by the RSC process exhibited the optimal corrosion resistance, with its corrosion current density reduced by 64.4% compared with that of the as-cast MG alloy.