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<p>This work investigates magnesium-calcium alloys with varying calcium content (1, 2, and 3 wt.%) produced via powder metallurgy. The study aims to improve their mechanical strength and corrosion resistance for potential biomedical applications. The microstructural investigation demonstrated grain refinement and the emergence of Mg<sub>2</sub>Ca intermetallic phases with elevated calcium concentration. Mechanical testing showed that adding calcium significantly enhanced hardness, with an increase of 48.84% for magnesium-3wt.% calcium compared to pure magnesium. Magnesium-1wt.% calcium exhibited the highest ultimate compressive strength (258&#xa0;MPa) and moderate fracture strain, whereas a higher calcium content reduced ductility due to brittle Mg<sub>2</sub>Ca phases. Electrochemical testing in simulated body fluid indicated that magnesium-1wt.% calcium exhibited the best corrosion resistance with lower I<sub>corr</sub> (219.01&#xa0;µA/cm<sup>2</sup>) and corrosion rate (5.074&#xa0;mm/year). In contrast, the corrosion rate increased from 5.681&#xa0;mm/year for pure Magnesium to 6.225&#xa0;mm/year for magnesium-3 wt.% calcium due to the formation of Mg<sub>2</sub>Ca phases, which accelerated degradation. Overall, the magnesium-1wt.% calcium alloy demonstrated the best combination of strength, hardness, and corrosion resistance, highlighting its potential as a biodegradable implant material.</p>

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Mechanical Properties and Biocorrosion Behavior of Mg-Ca Alloys Fabricated by Powder Metallurgy

  • 期刊论文

  • 发表日期：

    2025年5月9日

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

摘要

This work investigates magnesium-calcium alloys with varying calcium content (1, 2, and 3 wt.%) produced via powder metallurgy. The study aims to improve their mechanical strength and corrosion resistance for potential biomedical applications. The microstructural investigation demonstrated grain refinement and the emergence of Mg2Ca intermetallic phases with elevated calcium concentration. Mechanical testing showed that adding calcium significantly enhanced hardness, with an increase of 48.84% for magnesium-3wt.% calcium compared to pure magnesium. Magnesium-1wt.% calcium exhibited the highest ultimate compressive strength (258 MPa) and moderate fracture strain, whereas a higher calcium content reduced ductility due to brittle Mg2Ca phases. Electrochemical testing in simulated body fluid indicated that magnesium-1wt.% calcium exhibited the best corrosion resistance with lower Icorr (219.01 µA/cm2) and corrosion rate (5.074 mm/year). In contrast, the corrosion rate increased from 5.681 mm/year for pure Magnesium to 6.225 mm/year for magnesium-3 wt.% calcium due to the formation of Mg2Ca phases, which accelerated degradation. Overall, the magnesium-1wt.% calcium alloy demonstrated the best combination of strength, hardness, and corrosion resistance, highlighting its potential as a biodegradable implant material.