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Related Experiment Videos

Debao Liu1, Guangquan Xu2, Sina S Jamali3

  • 1School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China; ARC Research Hub for Australian Steel Manufacturing, University of Wollongong, NSW, Australia.

Bioelectrochemistry (Amsterdam, Netherlands)
|June 2, 2019
PubMed
Summary

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This study developed a novel magnesium-matrix composite reinforced with hydroxyapatite (HA) particles for biomedical uses. The resulting biodegradable material shows improved mechanical properties and corrosion resistance, making it suitable for bone implants.

Area of Science:

  • Biomaterials Engineering
  • Materials Science
  • Orthopedic Research

Background:

  • Magnesium alloys offer bone-like elastic modulus and density, ideal for biodegradable implants.
  • Non-toxic elements are crucial for biocompatible degradable materials.
  • Hydroxyapatite (HA) particle reinforcement enhances magnesium alloy properties.

Purpose of the Study:

  • To fabricate a biodegradable HA-particle-reinforced magnesium-matrix composite (Mg-3Zn-0.2Ca-1HA) for biomedical applications.
  • To investigate the microstructure, mechanical properties, corrosion resistance, and cell biocompatibility of the composite.
  • To evaluate the composite's potential as a bone substitute material.

Main Methods:

  • Fabrication using high shear solidification (HSS) and hot extrusion.
Keywords:
CytocompatibilityElectrochemical inhomogeneityHA/Mg-Zn-Ca compositeMechanical properties, bio-corrosion behaviorScanning electrochemical microscopy

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  • Microstructural analysis to observe grain structure refinement.
  • Mechanical testing (yield strength, ultimate tensile strength, elongation).
  • Corrosion evaluation via electrochemical and immersion tests.

    • Main Results:

    • HSS produced a uniform, fine-grained structure in the Mg-3Zn-0.2Ca-1HA composite.
    • Hot extrusion further refined the microstructure.
    • The extruded composite achieved a yield strength of 322 MPa, ultimate tensile strength of 341 MPa, and elongation of 7.6%.
    • Corrosion rate was measured at 1.52 mm/y, with slightly improved corrosion resistance compared to the matrix alloy.

    Conclusions:

    • The Mg-3Zn-0.2Ca-1HA composite fabricated by HSS and hot extrusion exhibits promising mechanical properties and enhanced corrosion resistance.
    • The refined microstructure contributes to improved material performance.
    • This biodegradable composite shows potential for orthopedic and bone regenerative applications.