Design and characterization of biodegradable Mg-Zn-Ag metallic glasses
In order to develop the Mg-Zn-Ag metallic glasses(MGs)for biodegradable implant applications,the glass formation ability(GFA)and biocompatibility of Mg-Zn-Ag alloys were investigated using a combination of the calculation of phase diagrams(CALPHAD)and experimental measurements.High GFA potentiality of two alloy series,specifically Mg96-xZnxAg4 and Mg94-xZnxAg6(x=17,20,23,26,29,32,35),was predicted theoretically and then substantiated through experimental testing.X-ray diffraction(XRD)and differential scanning calorimetry(DSC)techniques were used to evaluate the crystallinity,GFA,and crystallization characteristics of these alloys.The results showed that compositions between Mg73Zn23Ag4 and Mg64Zn32Ag4 for Mg96-xZnxAg4,Mg66Zn28Ag6 and Mg63Zn31Ag6 for Mg94-xZnxAg6 displayed a superior GFA.Notably,the GFA of the Mg96-xZnxAg4 series was better than that of the Mg94-xZnxAg6 series.Furthermore,the Mg70Zn26Ag4,Mg74Zn20Ag6,and Mg71Zn23Ag6 alloys showed acceptable corrosion rates,good cytocompatibility,and positive effects on cell proliferation.These characteristics make them suitable for applications in medical settings,potentially materials as biodegradable implants.
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