Browsing by Author "Gariba A.M.M."

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Microstructural and Mechanical Properties of Ti-B4C/CNF Functionally Graded Materials
(2022-10-01) Gariba A.M.M.; Islak S.; Hraam H.R.H.; Akkaş M.
This study aims to investigate the microstructural and mechanical properties of titanium (Ti) matrix boron carbide (B4C) + carbon nanofiber (CNF)-reinforced functional-graded materials (FGMs) produced using the powder metallurgy method. B4C was added to the Ti matrix at different rates, namely, 5, 10, and 15% by volume, and CNF was added at a rate of 0.5% by volume. The effect of B4C and CNF on the properties of these composite layers was then investigated. In addition, the mechanical properties of the FGMs were compared with the mechanical properties of non-layered structures. In addition, the microstructural, phase formation, hardness, and transverse rupture strength properties of the samples were investigated in detail. The microstructural investigation revealed that the B4C and CNF were homogeneously distributed throughout the Ti matrix and that the layers had bonded properly. With the addition of B4C and CNF, the hardness of the materials increased significantly. The transverse rupture strengths of the FGMs were higher than those of the non-layered samples (with the exception of pure Ti), indicating that the middle layers increased the toughness of the materials.
Microstructure and Mechanical Properties of Ti-Cu-Based Materials Produced by Using Reactive Melt Infiltration and Liquid Phase Sintering Techniques
(2023-08-01) Hraam H.R.H.; Islak S.; Gariba A.M.M.
Wear and Microstructural Properties of Ni-B4C/CNF Composites
(2022-01-01) Islak S.; Koç V.; Gariba A.M.M.
The aim of this study is to investigate the microstructure and wear properties of nickel (Ni) matrix boron carbide (B4C) and carbon nanofiber (CNF)-reinforced composite materials. Microstructure and phase composition of the composites manufactured by powder metallurgy (PM) method were determined by SEM-EDS and XRD analysis. While hardness values of the composites were determined by Vickers hardness measurement method, their wear properties were determined by using pin-on-disc method. SEM images showed that B4C was homogeneously distributed, but CNF accumulated in some areas, even though it was slight. Addition of B4C and CNF to the matrix significantly increased it. The increase was quite high in B4C addition, and hardness was slightly lower in the addition of CNF. According to the results of the wear test carried out under dry conditions, the reinforcement to the Ni matrix reduced the wear rate and friction coefficient.