1. Advanced Alloys for Biomedical Implants
College of Engineering & Applied Science
Materials Science and Engineering Department
Advanced Alloys for Biomedical Implants by
Murtatha Jamel

2. Why Mg Physical Properties Compatibility
The density ( g/cm3) is similar to human cortical bone (1.75 g/cm3)
Mechanical properties, E of natural bone (10–20 GPa), Mg (41–45 GPa)
Can reduce stress shielding effect
Compatibility
Mg has no toxic effect
Can be absorbed by the body as vitamins
Intake of Mg 240–420 mg/day
The excess will be excreted by the kidneys and intestine
Stimulates multiple enzyme system
1.Chen (2014), 9. Li (2013)

3. Biodegradable-Nontoxic Mg-Alloying System
Objectives & Novelty
Selecting alloying elements with good biocompatibility
Eliminating the processing defects
Reducing micro segregation by using rapid solidification.
Studying the effect of cooling rate and alloying elements
Studying the relationship between the grain size and alloy performance
Studying the effectiveness of shifting the overall chemical potential of the alloy
Novelty
Biodegradable-Nontoxic Mg-Alloying System

4. Conclusion The grain size was reduced with increasing the cooling rate
Increasing the content of alloying elements refined the structure and prompted more continuous secondary phase
The rapid solidification improved the hardness by 40%
Adding alloying elements further improved the hardness up to 65%
The impact strength was slightly affected by the cooling rate and alloying elements
The fracture morphology showed slightly less deformation with increasing the cooling rate
The deformation and fracture path were significantly reduced with adding alloying elements

5. References
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ASM Specialty Handbook: Magnesium and Magnesium Alloys. ASM International, edited by M. Avedesian and Hugh Baker, Pp15, 51, ,170,
Dietary Reference Intakes (DRIs): Estimated Average Requirements Food and Nutrition Board, Institute of Medicine, National Academies, 2014, table 3.
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Nan Li, Yufeng Zheng . “Novel Magnesium Alloys Developed for Biomedical Application” Journal of Materials Science & Technology, 6/2013, Vol.29(6), pp
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Frank Witte “Reprint of: The history of biodegradable magnesium implants” Acta Biomaterialia, 1 September 2015, Vol.23, pp.S28-S40.
Seelig MG. “A study of magnesium wire as an absorbable suture and ligature material”. Arch Surg 1924;8 (2):669–80.
Andrews EW. “Absorbable metal clips as substitutes for ligatures in wound closure”. JAMA 1917;28:278–81.