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- 저자 : Oluwasegun Eso Falodun (검색결과 2 건)
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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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Falodun Oluwasegun Eso,Oke Samuel Ranti,Akinwamide Olukayode Samuel,Olubambi Peter Apata 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.3
The impacts of Cr-TiB 2 addition on densifi cation, hardness, microstructure, phase transformation, and corrosion were examined. The results indicated an even and uniform dispersion of TiB 2 particles in the titanium matrix, with no noticeable interfaces throughout the sintering process. The relative density of the sintered titanium-based composites dropped, with an increase in TiB 2 percentage. The microhardness result indicated that Ti6Al4V has 326 HV 0.5, while the maximum hardness was 598 HV 0.5, produced from 20 wt.% TiB 2 ceramic particles. The Ti6Al4V alloy depicts α-phase forms parallel plates in the prior β-grain borders and expands into the β-grain to create α-colonies, while the addition of 5–20 wt.% Cr-TiB 2 resulted in a microstructural transformation characterized by equiaxed α-precipitates embedded within the β-phase matrix, for all sam- ples. The electrochemical behaviour revealed that the E corr decreased as TiB 2 increased, while the i corr was higher. However, samples containing 5Cr and 5Cr-5TiB 2 moved to a more positive E corr region, whereas the i corr altered to a more negative area. This meant that the presence of ceramic reinforcements increased the corrosion resistance of the alloys and that higher concentrations of titanium diboride provided less protection against ion attack in a chloride environment.
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