Yazar "Yeprem, H. Aygul" seçeneğine göre listele

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    ALUMINIUM OXIDE (Al2O3)-FEW LAYER GRAPHENE (FLG) REINFORCED ALUMINIUM HYBRID COMPOSITES
    (POLISH SOC COMPOSITE MATERIALS, 2022) Kaykılarlı, Cantekin; Altinisik, Zehra; Kilic, E. Can; Uzunsoy, Deniz; Yeprem, H. Aygul
    The present study investigates the microstructural and mechanical properties of few layer graphene (FLG, 0.1 to 5 wt.%) and aluminium oxide (Al2O3, 4 to 20 wt.%) reinforced Al6061 matrix composites prepared via mechanical alloying (MA), uniaxial pressing and pressureless sintering. The effects of the amounts of Al2O3 and FLG were studied. MA was carried out at 300 rpm for 3 h in a planetary ball mill in argon atmosphere. The mechanically alloyed (MAed) powders were compacted via uniaxial pressing (400 MPa) and sintering (620 degrees C, 2 h). The microstructural and mechanical properties of the Al-xAl(2)O(3)-yFLG powders and bulk samples were investigated via X-ray diffraction (XRD), light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), the Archimedes' method and a hardness test. In the XRD analysis, the aluminium carbide (Al4C3) phase was not detected. The SEM, LM micrographs and EDS results show that the produced composites have a homogeneous structure. Based on the Archimedes' method, the densification rates of the rein-forced samples were higher than the unreinforced sample. The Al-20Al(2)O(3)-3FLG sample exhibited the highest relative density, 99.25%. According to the hardness measurements, the highest hardness value was 87.28 HV for the Al-20Al(2)O(3)-1FLG composite and increased twofold compared to Al6061.
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    Production and characterization of Al2O3 and CeO2-reinforced titanium matrix hybrid composites
    (Wiley, 2025) Kaykilarli, Cantekin; Uzunsoy, Deniz; Yeprem, H. Aygul
    Titanium matrix composites (TMCs) offer exceptional properties like high specific modulus, high specific strength, resistance to high temperatures and wear, and the potential to reduce weight. So, TMCs find uses in several industries, including automotive, maritime, aerospace, biomedical, petrochemical, structural, chemical, and advanced military sectors. In the present study, Al2O3 and CeO2-reinforced TMCs were prepared via the powder metallurgy (P/M) method and microstructural, mechanical and tribological features were investigated. An Al2O3 (5 wt.%) and CeO2 (1, 2 and 3 wt.%) were reinforced into the TMCs via mechanical alloying (MA) for 5 h in a high-energy ball mill. The mechanically alloyed (MA'ed) powders were compacted via hydraulic press under uniaxial pressure of 450 MPa. The compacted samples were sintered at 1200 degrees C for 2 h in an argon atmosphere. By adding CeO2, the hardness, relative density and shrinkage were reduced, but the wear resistance and compressive strength were increased.
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    Role of process control agent in the production of Al2O3-reinforced titanium matrix composites
    (Elsevier Sci Ltd, 2024) Kaykilarli, Cantekin; Uzunsoy, Deniz; Yeprem, H. Aygul
    Metal Matrix Composites (MMCs) have recently been preferred over traditional materials in many engineering applications. Titanium matrix composites (TMCs) are used in the automotive, aerospace and defence industries thanks to their exceptional strength, high fatigue strength, good corrosion resistance and high elastic modulus. Some of the most used reinforcement materials for TMCs are SiC, Zr2O3, Al2O3, graphene, carbon nanotube (CNT) and TiC. In this study, TMCs reinforced Al2O3 were produced via conventional powder metallurgy (PM) and ultrasonic-assisted mixing. An Al2O3 in varying amounts (5 and 10 wt%) was incorporated into the TMCs via mechanical alloying (MA) for 5 h in a high-energy ball mill and using different process control agents (PCA, Stearic acid (SA), Polyvinyl Alcohol (PVA), Ethanol). The mechanically alloyed (MA'ed) powders were compacted by a hydraulic press under uniaxial pressure of 450 MPa and sintered at 1200 degrees C for 2 h in an argon atmosphere. The microstructural, mechanical and tribological properties of Ti-xAl2O3 powders and bulk samples were investigated. The highest hardness and the lowest specific wear rate were found in specimens reinforced with 5 wt% Al2O3, using ethanol as PCA, and produced by ultrasonic-assisted mixing, but the same specimen had the lowest compressive strength.