Samples of copper-aluminum reinforced metal matrix composite (MMC) were prepared by liquid metallurgy method using micron–sized silicon carbide (SiC) particulate. The resultant MMC samples were characterized to determine their thermal, electrical and mechanical properties in respect to varying particle sizes (212, 425, 710 and 1200 mm) of the SiC. The analyses of the results obtained showed that the thermal conductivity of the composite increased with decrease in particle size and volume fraction of the SiC. Also with decrease in grains size, high thermal conductivity was achieved by increasing the volume fraction. The results obtained in this study showed that alloying Cu matrix with aluminium is effective in reducing the interfacial reactions of a typical Cu-SiC matrix composite. The synthesized MMC samples also possessed a combination of high thermal and electrical conductivities with a low coefficient of thermal expansions which is synonymous to a low tensile strain at a maximum load. These properties were achieved for a 60%Cu/Al(40%SiC) at 212 µm, 50%Cu/Al(50%SiC at 12 µm and 70%Cu/Al(30%SiC) at 710 µm. The microstructural evaluation using optical microscopy (OM) indicated good dispersion of the SiC particles in all the samples which consequently enhanced the microhardness obtained in the MMC samples.
The tribological characteristics of Ti alloys containing beta stabilisers such as Mo, Nb, Ta, Zr, and Sn have seldom been explored despite their applicability for metallic biomaterials requiring good wear and surface degradation resistance. Using sliding wear contact, the influence of these alloying components on Ti-Mo biomedical alloys in simulated physiological fluid was examined. Microalloying influences microstructure, hardness, and wear. Nb-microalloyed samples with metastable -phase increased anti-wear and frictional resistance while keeping frictional resistance. Orthorhombic α ′′ phase-rich samples were the least wear resistance. The findings contribute to a better understanding of the interaction between Ti-based biomaterials' micro-alloying and their tribological properties. The stabilised TiMo (Nb,Ta, Zr, or Sn) alloys outperformed CP-Ti, the original Ti92Mo8, and the regularly used biomedical Ti6Al-4V alloys in terms of corrosion resistance. This indicates that alloying tuning may be used to enhance biomedical prosthesis and increase the service life of bio-implants and components.
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