Mechanical properties and corrosion behavior of Mg-HAP composites Articles uri icon

publication date

  • November 2014

start page

  • 238

end page

  • 246

volume

  • 39

international standard serial number (ISSN)

  • 1751-6161

electronic international standard serial number (EISSN)

  • 1878-0180

abstract

  • Mg and Mg-HAP composites containing 5, 10 and 15 wt% of hydroxyapatite have been produced following a powder metallurgy route that consists of mixing raw powders and consolidation by extrusion. The microstructure, texture, mechanical behavior and resistance to corrosion under a PBS solution have been studied. Addition of HAP increases the microhardness of the composites, however the yield strength under compression slightly decreases. Texture analyses reveal a fiber texture for pure Mg that is weakened increasing the HAP fraction. This texture promotes twinning and softening of Mg and Mg-5HAP during the initial deformation stages. Mg-10HAP and Mg-15HAP present a strain-hardening dependence showing no softening. The volume fraction of HAP particles weakens the texture and favors the activation of secondary slip systems. Corrosion experiments in PBS solution have shown that Mg-5HAP exhibits the best resistance to corrosion. Texture and porosity appear to be the main material features controlling the corrosion rates of Mg-HAP composites under the present conditions. (C) 2014 Elsevier Ltd. All rights reserved.

keywords

  • magnesium; hydroxyapatite; composites; bomaterial; corrosion; mechanical properties; biomedical applications; degradation behavior; calcium-phosphate; magnesium alloy; hydroxyapatite; texture; biomaterials; deformation; coatings; al