Antibacterial and Microstructural Evolution in Silver Modified NiTi Shape Memory Alloy
DOI:
https://doi.org/10.5281/zenodo.16745547Keywords:
NiTiAg alloy, antibacterial, shape memory alloys, antibacterial, shape memory alloysAbstract
This study examines the microstructural properties, phase behavior, and antibacterial activity of nickel-titanium (NiTi) shape memory alloys (SMAs) doped with varying concentrations of silver (Ag). Five distinct alloys were produced through arc melting followed by homogenization. X-ray diffraction (XRD) analysis revealed that increasing Ag content stabilizes the B2 phase and suppresses martensitic transformation. Microstructural evaluations showed that low Ag content promoted grain refinement, whereas higher additions led to the formation of secondary phases. Disk diffusion tests indicated a notable antibacterial effect in the Ag4 sample, particularly against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The results suggest that Ag doping enhances the antimicrobial efficacy of NiTi alloys, making them promising candidates for reducing infection risks in biomedical applications.
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