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<p>The biocompatibility and appropriate degradation rates of zinc-based alloys have garnered increasing attention for their potential application in biodegradable implants. However, their limited mechanical performance restricts their broader utilization. This study aims to enhance the performance of Zn-3Mg-0.5Zr composites, fabricated via spark plasma sintering (SPS), for biomedical applications by examining the effects of yttrium (Y) addition on their mechanical properties and microstructure. Yttrium was incorporated into the Zn-Mg-Zr matrix in varying weight percentages (0.1–0.5&#xa0;wt.%). Microstructural analysis employing X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and scanning electron microscopy (SEM) revealed Y-rich intermetallic phases and significant grain refinement. These phases contribute to strengthening through mechanisms such as dispersion hardening, solid-solution strengthening, and grain boundary pinning. The sample with 0.3&#xa0;wt.% Y exhibited the highest ductility, with an elongation of 4.59%, whereas the composite with 0.5 wt.% Y demonstrated the greatest compressive strength (241.87&#xa0;MPa) and Vickers hardness (48–50 HV). The XRD peak shifts further confirmed the lattice deformation and the onset of precipitation hardening. However, SPS-induced texturing was identified as the cause of mechanical anisotropy. The addition of Y significantly enhanced the mechanical properties of the Zn-3Mg-0.5Zr composites through synergistic strengthening mechanisms. These improvements suggest that Y-alloyed Zn composites are promising as bioresorbable implant materials. Nonetheless, further investigation into the tensile and fatigue behaviors, as well as comprehensive biological evaluations, is required to confirm their therapeutic efficacy.</p>

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Microstructural Evolution and Mechanical Performance of Y-doped Zn-3Mg-0.5Zr Composites for Biodegradable Implants

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • K. S. Kadam,
  • V. S. Gadakh,
  • S. Ponnapureddy

摘要

The biocompatibility and appropriate degradation rates of zinc-based alloys have garnered increasing attention for their potential application in biodegradable implants. However, their limited mechanical performance restricts their broader utilization. This study aims to enhance the performance of Zn-3Mg-0.5Zr composites, fabricated via spark plasma sintering (SPS), for biomedical applications by examining the effects of yttrium (Y) addition on their mechanical properties and microstructure. Yttrium was incorporated into the Zn-Mg-Zr matrix in varying weight percentages (0.1–0.5 wt.%). Microstructural analysis employing X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and scanning electron microscopy (SEM) revealed Y-rich intermetallic phases and significant grain refinement. These phases contribute to strengthening through mechanisms such as dispersion hardening, solid-solution strengthening, and grain boundary pinning. The sample with 0.3 wt.% Y exhibited the highest ductility, with an elongation of 4.59%, whereas the composite with 0.5 wt.% Y demonstrated the greatest compressive strength (241.87 MPa) and Vickers hardness (48–50 HV). The XRD peak shifts further confirmed the lattice deformation and the onset of precipitation hardening. However, SPS-induced texturing was identified as the cause of mechanical anisotropy. The addition of Y significantly enhanced the mechanical properties of the Zn-3Mg-0.5Zr composites through synergistic strengthening mechanisms. These improvements suggest that Y-alloyed Zn composites are promising as bioresorbable implant materials. Nonetheless, further investigation into the tensile and fatigue behaviors, as well as comprehensive biological evaluations, is required to confirm their therapeutic efficacy.