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Investigating Microstructure, Mechanical Properties and Corrosion Resistance of New Biodegradable Mg-2Zn-xAg-yCu (x=0-0.6,y=0-0.1) Alloys

Asadollahi Avilagh, Mohammad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55154 (07)
  4. University: Sharif University of Technolog
  5. Department: Materials Science and Engineering
  6. Advisor(s): Alizadeh, Reza; Sadrnezhaad, Khatiboleslam
  7. Abstract:
  8. Magnesium has recently been considered as a biocompatible metal with mechanical properties close to bone for use in biological applications. On the other hand, the degradation properties of this metal in the physiological environment have made this metal superior to permanent biomaterials such as stainless steel, titanium alloys. The most important challenge of using this alkaline earth metal in the body environment is its rapid corrosion, which causes problems such as alkaline toxicity and loss of supporting role before complete tissue repair. In this study, Mg-Zn-Ag-Cu alloys were manufactured to improve mechanical strength, corrosion resistance and antibacterial properties. Finally, after casting and alloying, microstructural, mechanical and corrosion studies were performed on the samples in different conditions (as-cast, solid solution and multi-directional forging). The obtained results showed that forging and solution treatments improved the corrosion properties of the alloys. The Mg-2Zn-0.2Ag sample showed the best corrosion properties among copper and silver containing alloys. In addition, mechanical properties of this alloy were suitable for being used as orthopedic biomaterials. Finally, according to the obtained results, a corrosion mechanism was proposed for Mg-2Zn-0.2Ag alloy. In fact, the presence of a double layer of surface film on the T4 and MDF samples of Mg-2Zn-0.2Ag alloy could improve their corrosion resistance compared to the as-cast sample
  9. Keywords:
  10. Magnesium Alloy ; Corrosion Resistance ; Mechanical Properties ; Antibacterial Properties ; Heat Treatment ; Multidirectional Forging ; Biodegradable Magnesium Alloys

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