Browsing by Author "Bouchareb Nabila"

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    Synthesis, structural, electrochemical and tribological characterization of nanostructured compound based on titanium (Ti-Ni) for biomedical applications
    (2025) Bouchareb Nabila
    Medical implants are essential for improving the quality of life of people who suffer, especially in the orthopedic field. Therefore, the need for biomaterials has increased exponentially as a result of the necessity for replacing or repairing damaged parts of the human body to regain the missing shape or functionality of biological tissue. To achieve the long-term performance of these implants, they must have distinct mechanical, tribological, and electrochemical properties. In this context, this study aims to examine the effect of milling times on the mechanical, tribological, and electrochemical properties of Ti50-Ni50 (or Nitinol), which is one of the most attractive materials in the medical field for orthopedic implants due to its unique properties. Ti50-Ni50 alloys were synthesized using high-energy ball milling under different milling times (2, 6, 12, and 18 h). The size, shape, and uniform chemical composition of the powder particles were examined using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The alloyed particles' structural characteristics were determined through the use of X-ray diffraction (XRD). Mechanical properties were assessed using hardness tests, while tribological behavior was examined using a ball-on-plate tribometer operating in Ringer's Solution under various applied load of 2, 10, and 20 N. The electrochemical properties were characterized by open-circuit potential (OCP) measurement, potentiodynamic polarization (PD), and the Electrochemical Impedance Spectroscopy (EIS) technique. To simulate typical biological conditions, Hank's solution at pH = 7.4 and T = 37 °C were used as the electrolyte. The results revealed that the milling process influences the particle size and shape of powders, where the proportion of fine particles increased with increasing grinding times from 2 h to 18 h due to severe deformation and fracturing. This improvement in particle refinement contributed to enhanced mechanical attributes, wear resistance, and corrosion resistance, making the material useful for bone implants.