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<p>This study investigates the fabrication and characterization of magnesium-hydroxyapatite (Mg-HAP) nanocomposites for biodegradable implant applications using powder metallurgy. Mg-HAP nanocomposites with varying hydroxyapatite&#xa0;nanoparticle&#xa0;(HAP<sub>np</sub>) content (1, 2, and 3 wt.%) were synthesized, and their microstructural and mechanical properties were systematically evaluated. The results demonstrate that HAP<sub>np</sub> addition slightly refined grain structure and enhanced mechanical performance. The Mg-2HAP composite exhibited optimal properties, achieving a 32% increase in microhardness and an 8% improvement in compressive strength while maintaining uniform HAP<sub>np</sub> dispersion and low porosity. In contrast, Mg-3HAP exhibited higher mechanical gains (48% in microhardness and 11.9% in compressive strength), but it suffered from nanoparticle agglomeration and reduced ductility. Fractographic analysis showed a transition from shear fracture mode to brittle failure&#xa0;with increasing HAP<sub>np</sub> content. The study concludes that powder metallurgy is a viable route for producing Mg-HAP nanocomposites, and that&#xa0;2 wt.% HAP<sub>np</sub> represents the optimal reinforcement concentration for orthopedic applications.</p>

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Fabrication and Characterization of Mg-HAP Nanocomposites via Powder Metallurgy

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Rawad Yaqoub Aljabr,
  • P. S. C. Bose

摘要

This study investigates the fabrication and characterization of magnesium-hydroxyapatite (Mg-HAP) nanocomposites for biodegradable implant applications using powder metallurgy. Mg-HAP nanocomposites with varying hydroxyapatite nanoparticle (HAPnp) content (1, 2, and 3 wt.%) were synthesized, and their microstructural and mechanical properties were systematically evaluated. The results demonstrate that HAPnp addition slightly refined grain structure and enhanced mechanical performance. The Mg-2HAP composite exhibited optimal properties, achieving a 32% increase in microhardness and an 8% improvement in compressive strength while maintaining uniform HAPnp dispersion and low porosity. In contrast, Mg-3HAP exhibited higher mechanical gains (48% in microhardness and 11.9% in compressive strength), but it suffered from nanoparticle agglomeration and reduced ductility. Fractographic analysis showed a transition from shear fracture mode to brittle failure with increasing HAPnp content. The study concludes that powder metallurgy is a viable route for producing Mg-HAP nanocomposites, and that 2 wt.% HAPnp represents the optimal reinforcement concentration for orthopedic applications.