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- 저자 : Avwerosuoghene Moses Okoro (검색결과 2 건)
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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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Oluwasegun Eso Falodun,Samuel Ranti Oke,Babatunde Abiodun Obadele,Avwerosuoghene Moses Okoro,Peter Apata Olubambi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
The titanium-based composite was fabricated by strengthening Ti6Al4V alloy with addition of SiAlON ceramics utilizingspark plasma sintering technique. Ti6Al4V and SiAlON powders were mixed in a T2F Turbula mixer with different proportions(5, 10, 15 and 20 vol%) and the admixed powders were consolidated using spark plasma sintering to produce titaniummatrix composites. The characterization of the sintered composites was performed using X-ray diffraction, optical microscopyand scanning electron microscopy. The influence of SiAlON additions on densification, microstructure, microhardness andfracture morphology were investigated on the sintered composites. The experimental results revealed that the densificationof the sintered titanium matrix composites was in the range of 95%–98%, which decreased with an increase in SiAlONaddition. However, an increase in microhardness values ranging from 363 to 574 HV0.1 was achieved. The microstructureshows that the SiAlON ceramic particle was uniformly distributed within the titanium matrix composites which comprisesof a mixture of lamellar colonies with β grain boundaries. The fracture features of all composites exhibit mixed fracture ofboth intergranular and transgranular fracture mechanism.
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