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<p>This study designed and fabricated a Mg-Zn-Ni-Gd-Y alloy incorporating a long-period stacking ordered (LPSO) phase, nanoscale β′ precipitates, and trace Mg<sub>2</sub>Ni phase, systematically investigating the effects of hot extrusion temperature and aging treatment on microstructural evolution, mechanical properties, and dissolution behavior. Lower extrusion temperatures were found to preserve a higher volume fraction of the LPSO phase, while a two-stage aging process effectively promoted the formation of intra-granular nanoscale β′ precipitates. The 400T5X alloy, characterized by refined grains with abundant LPSO phases and nanoscale β′ distribution, demonstrated optimal performance: a room temperature tensile strength of 378&#xa0;MPa, yield strength of 318&#xa0;MPa, elongation of 11.6%, and a dissolution rate of 224.3&#xa0;mg·cm<sup>-2</sup>·h<sup>-1</sup> in 3&#xa0;wt.% KCl solution at 93&#xa0;°C. Microstructural analysis revealed that the LPSO phase facilitated dynamic recrystallization while inhibiting grain growth, concurrently accelerating dissolution through micro-galvanic coupling with the Mg matrix and Mg<sub>2</sub>Ni phase. Meanwhile, the nanoscale β′ phase significantly enhanced mechanical properties via intense dislocation pinning. These findings provide insights into designing Mg alloys with balanced strength and controlled dissolution rates for degradable applications.</p>

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High Strength and Degradability in Mg-Zn-Ni-Gd-Y Alloys via LPSO and Nano-Precipitation

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Yibin Jia,
  • Quanan Li,
  • Xiaoya Chen,
  • Dongzhen Wang,
  • Zeng Wu,
  • Mengen Ji,
  • Jian Zeng

摘要

This study designed and fabricated a Mg-Zn-Ni-Gd-Y alloy incorporating a long-period stacking ordered (LPSO) phase, nanoscale β′ precipitates, and trace Mg2Ni phase, systematically investigating the effects of hot extrusion temperature and aging treatment on microstructural evolution, mechanical properties, and dissolution behavior. Lower extrusion temperatures were found to preserve a higher volume fraction of the LPSO phase, while a two-stage aging process effectively promoted the formation of intra-granular nanoscale β′ precipitates. The 400T5X alloy, characterized by refined grains with abundant LPSO phases and nanoscale β′ distribution, demonstrated optimal performance: a room temperature tensile strength of 378 MPa, yield strength of 318 MPa, elongation of 11.6%, and a dissolution rate of 224.3 mg·cm-2·h-1 in 3 wt.% KCl solution at 93 °C. Microstructural analysis revealed that the LPSO phase facilitated dynamic recrystallization while inhibiting grain growth, concurrently accelerating dissolution through micro-galvanic coupling with the Mg matrix and Mg2Ni phase. Meanwhile, the nanoscale β′ phase significantly enhanced mechanical properties via intense dislocation pinning. These findings provide insights into designing Mg alloys with balanced strength and controlled dissolution rates for degradable applications.