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Avwerosuoghene Moses Okoro,Ronald Machaka,Senzeni Sipho Lephuthing,Mary Ajimegoh Awotunde,Peter Apata Olubambi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
In this study, the role of multiwall carbon nanotubes (MWCNT) on the microstructural evolution and mechanical propertiesof Ti6Al4V-based composites was investigated. This was conducted by dispersing different concentrations (0.5, 1.0 and1.5 wt%) of MWCNT into the Ti6Al4V matrix using shift-speed ball milling technique. Thereafter, the Ti6Al4V and thenanocomposites were consolidated via the spark plasma sintering technique. Various characterization techniques; scanningelectron microscopy (SEM), transmission electron microscopy (TEM) and light microscopy were conducted to understandthe microstructural evolution of the samples after the dispersion and sintering process. Subsequently, micromechanical andnanoindentation was carried out to reveal the mechanical properties of the fabricated samples. The morphological examinationusing SEM and TEM revealed the dispersibility of MWCNT dispersed within the Ti6Al4V matrix. Besides, the selectedarea diffraction and the fast Fourier Transform pattern demonstrated that the increase in concentration of the MWCNTexposed the nanotubes to adverse stresses during the dispersion process. Furthermore, the incorporation and increase inconcentration of the MWCNT in the titanium alloy resulted in microstructural and phase changes, which translate to tremendousimprovements in microhardness, nanohardness and elastic modulus up to 46.9%, 150.8%, and 169.5% respectively.
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