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<p>The effects of Yb on the microstructure, mechanical properties, and flame resistances of the Mg–Gd–Y–Zn alloys were systematically investigated in this research. The results indicated that the Yb-free alloy mainly consisted of an α-Mg matrix and LPSO phases, while the Mg5RE phases were formed after the addition of Yb. As the Yb content increased, the volume fractions of the LPSO phases decreased while the volume fractions of the Mg<sub>5</sub>RE phases increased. After heat treatment, partial LPSO phases changed from blocky to lamellar, and Mg<sub>5</sub>RE phases changed from reticular to blocky. During the extrusion process, the addition of Yb effectively inhibited dynamic recrystallization of the alloy, refined the grains, and improved the strength of the alloy. The Yb addition also caused the outermost layer of the oxide film to form a thin and dense Yb<sub>2</sub>O<sub>3</sub> layer, which prevented internal oxidation, thereby reducing the residual compressive stress of the oxide film and improving flame resistance. The Mg–1Gd–1Y–1Zn–1Yb alloy exhibited the best comprehensive performance, with a yield strength, ultimate tensile strength, elongation, and ignition temperature of 330&#xa0;MPa, 360&#xa0;MPa, 7.0%, and 850&#xa0;°C, respectively.</p> Graphical Abstract <p></p>

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Effect of Yb Addition on the Microstructure, Mechanical Properties and Flame Resistance of Mg–Gd–Y–Zn Alloys

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Shuai Zhou,
  • Jonghyun Kim,
  • Zhaobin Zhang,
  • Yu Cao,
  • Taekyung Lee,
  • Bin Jiang

摘要

The effects of Yb on the microstructure, mechanical properties, and flame resistances of the Mg–Gd–Y–Zn alloys were systematically investigated in this research. The results indicated that the Yb-free alloy mainly consisted of an α-Mg matrix and LPSO phases, while the Mg5RE phases were formed after the addition of Yb. As the Yb content increased, the volume fractions of the LPSO phases decreased while the volume fractions of the Mg5RE phases increased. After heat treatment, partial LPSO phases changed from blocky to lamellar, and Mg5RE phases changed from reticular to blocky. During the extrusion process, the addition of Yb effectively inhibited dynamic recrystallization of the alloy, refined the grains, and improved the strength of the alloy. The Yb addition also caused the outermost layer of the oxide film to form a thin and dense Yb2O3 layer, which prevented internal oxidation, thereby reducing the residual compressive stress of the oxide film and improving flame resistance. The Mg–1Gd–1Y–1Zn–1Yb alloy exhibited the best comprehensive performance, with a yield strength, ultimate tensile strength, elongation, and ignition temperature of 330 MPa, 360 MPa, 7.0%, and 850 °C, respectively.

Graphical Abstract