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Öğe Effect of Few-Layered Graphene on the Corrosion Behaviour of the Al-Cu Matrix Composites(Springer, 2025) Kaykilarli, Cantekin; Eken, Taha Yasin; Kucukelyas, Burak; Uzunsoy, DenizIn the transportation, maritime and aviation industries, aluminum alloys - particularly those in the 2xxx series (Al-Cu type) - are frequently used because they offer an ideal combination of properties, including toughness, a high strength-to-weight ratio and fatigue resistance. Graphene, a two-dimensional material with a single-atom thickness composed of carbon atoms arranged in a hexagonal lattice, attracts interest due to its remarkable properties and is commonly utilized as a reinforcement in composite materials. Few-layered graphene (FLG) reinforced Al-4 wt.% Cu matrix composites were prepared via mechanical alloying (MA, 500 rpm, ball-to-powder ratio 7 : 1), uniaxial pressing (300 MPa), and conventional sintering (59 degrees C, 3 hours, argon gas flow). The present work investigates corrosion behaviors of FLG (0.25 and 0.5 wt.%) reinforced Al-4 wt.% Cu composites with different MA durations. Open-circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) measurements were carried out in a 3.5% NaCl solution to determine the corrosion behavior. Following the corrosion test, X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) analysis were performed on the specimen that exhibited the optimum results. The data obtained before and after the test were compared to investigate the structural changes that occurred as a result of the corrosion test. The analysis demonstrated that the sample reinforced with 0.5 wt.% FLG and subjected to 7 hours of MA had the highest corrosion resistance.Öğe Electromagnetic Shielding Effectiveness and Impact Test Performance of Carbon Fiber Reinforced Polymer Composites with Hematite and Goethite(John Wiley and Sons Inc, 2024) Eken, Taha Yasin; Kaykilarli, Cantekin; Kucukelyas, Burak; Tabakcioglu, Mehmet BarisCarbon fibers (CFs) are versatile materials widely employed in carbon fiber-reinforced polymer (CFRP) composites, known for their superior mechanical properties and electromagnetic interference (EMI) shielding capabilities. This study focuses on the successful production of 2-layer CFRP composites reinforced with hematite (Fe2O3) particles, in two different sizes (?44 µm (325 mesh) and 50 nm), and goethite (FeO(OH)), utilizing the hand lay-up method. The investigation encompasses EMI shielding effectiveness (SE) within a frequency range of 700 to 6000 MHz, and the drop-impact strength resistance properties (under a 6 J load). Results indicate that the highest EMI SE value, 60.19 dB at 5900 MHz, is achieved with 5 wt.% goethite reinforcements, while with a reduction in drop-impact strength. For hematite-reinforced composites, the highest EMI SE, measuring 57.85 dB at 5800 MHz, is observed for samples containing 15 wt.% hematite particles with a size of 50 nm, which exhibited an overall improvement in impact strength compared to non-reinforced samples. This research highlights the potential of these CFRP composites for EMI shielding applications, with considerations for their impact on mechanical properties, providing valuable insights for applications demanding both EMI protection and structural integrity. © 2023 The Authors. Macromolecular Materials and Engineering published by Wiley-VCH GmbH.Öğe Electromagnetic shielding effectiveness performance of carbon fiber reinforced polymer (CFRP) composites with hematite and goethite in far-field(Pamukkale Univ, 2024) Erbas, Ugur; Kaykilarli, Cantekin; Eken, Taha Yasin; Kucukelyas, Burak; Tabakcioglu, Mehmet BarisCarbon fibers (CFs) are indispensable materials in our daily life. The excellent bearing capacity, remarkable dielectric property, ease of production, and corrosion resistance of CFRP composites distinguish them from all other options in addition to them, CFRPs may also shield from electromagnetic interference (EMI). In this study, two-layer CF reinforced epoxy composites reinforced with two different hematite (alpha- Fe2O3) and goethite (FeO(OH)) particle sizes of 50 nm and 45 mu m (325 mesh) were produced using the manual lay-up method. Then, far field electromagnetic shielding effectiveness (SE) with 700 MHz- 6000 MHz range were examined. The maximum shielding effectiveness was determined to be at 5200 MHz with 39.28 dB for 5 wt.% FeO(OH), at 4700 MHz with 38.38 dB for 10 wt.% Fe2O3(325 mesh), at 3800 MHz with 37.15 dB for 15 wt.% Fe2O3(50 nm).Öğe Graphene nanoplatelet-coated electrodes with cellulose binders for 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl-based aqueous proselyte(Taylor & Francis Inc, 2025) Eken, Taha Yasin; Kaykilarli, Cantekin; Tuna, Ali; Parmak, Ebru Devrim Sam; Uzunsoy, Deniz; Peljo, PekkaThis study investigates the development of cellulose-bonded graphene nanoplatelet-coated electrodes for organic flow batteries (OFBs) utilizing 4-Hydroxy-2,2,6,6-Tetramethylpiperidine 1-oxyl (TEMPOL) as the active material. Graphite felt electrodes were coated via an optimized dip-coating process, varying the number of dips (1, 5 and 10). Cyclic voltammetry (CV) showed a 150% increase in oxidation peak current and a 250% increase in reduction peak current for the 10-dipped electrodes compared to pristine ones. Electrochemical impedance spectroscopy (EIS) revealed a 35% reduction in charge transfer resistance (Rp) for the 5-dipped electrodes, indicating enhanced ion transfer efficiency. Surface characterization analyses, including SEM, XRD and Raman spectroscopy, confirmed uniform graphene coatings and structural integrity, while contact angle measurements demonstrated a transition from hydrophobic (157 degrees) to hydrophilic (0 degrees) surfaces, improving wettability and electrolyte interaction. These findings establish cellulose as a sustainable, cost-effective binder, with potential scalability for large-scale energy storage applications.Öğe High entropy alloy reinforcement for superior electromagnetic interference shielding performance in carbon fiber-reinforced polymer composites(Wiley, 2025) Kucukelyas, Burak; Kaykilarli, Cantekin; Eken, Taha Yasin; Erbas, Ugur; Tabakcioglu, Mehmet BarisThis study explores the enhancement of electromagnetic interference (EMI) shielding effectiveness (SE) in carbon fiber-reinforced polymer (CFRP) composites through the integration of equatomic CoCuFeNi high entropy alloy (HEA) particles. Employing mechanical alloying (MA), CoCuFeNi HEA powders were synthesized, revealing a face-centered cubic structure with crystallite and particle sizes of 14.7 nm and 11.62 mu m, respectively. The integration of these HEA particles at concentrations of 5%, 10%, and 15% by weight into epoxy resin, followed by the fabrication of composites using the hand lay-up technique. Detailed structural analysis of HEA particles confirmed the successful synthesis of equatomic HEAs via MA. Structural analysis of the HEA integrated composites revealed vacancy regions at 5% concentration, a uniform distribution at 10%, and particle agglomeration causing inhomogeneity and vacancies at 15%. The composites demonstrated significant improvements in EMI SE, with the 10% HEA sample showing superior performance compared to the other samples. Specifically, the 10% HEA composite achieved a peak SE of 73.09 dB at 4.72 GHz, attributed to the optimized distribution of HEA particles that enhanced electrical conductivity and reflective properties.Highlights CoCuFeNi HEA particles were successfully synthesized via MA. HEA particles were added to epoxy at 5, 10, and 15 wt% for composite fabrication. Voids were observed in HEA5, uniformity in HEA10, and clustering in HEA15. EMI shielding was assessed using VNA, SE, dielectric permittivity, and magnetic permeability. The HEA10 composite achieved peak EMI shielding, 73.09 dB at 4.72 GHz.Öğe Investigation of microstructural, mechanical and corrosion properties of graphene nanoplatelets reinforced Al matrix composites(Iop Publishing Ltd, 2019) Akçamlı, Nazlı; Küçükelyas, Burak; Kaykilarli, Cantekin; Uzunsoy, DenizGraphene nanoplatelets (GNP) were utilized as reinforcement for Al matrix with the aim of exploiting its extremely high mechanical properties. GNP reinforced composites were prepared via powder metallurgical processing route based on mechanical alloying, cold pressing and pressureless sintering. 0.5 to 2 wt% of GNP were incorporated into the aluminum via mechanical alloying up to 8 h in a high-energy ball mill. The mechanically milled powders were compacted by two different methods as uniaxial cold pressing and cold isostatic pressing. The prepared powders and bulk samples were characterized by differential thermal calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX), optical microscopy (OM), and Archimedes density, microhardness and dry sliding wear tests. Additionally, corrosion properties of the Al-GNP composites were determined by the Tafel exploration method. The results showed that the optimum GNP amount could be expected as 0.5 wt%, which enhanced the microhardness and wear resistance values of the Al from 84.5;;1.98 HV and 0.7384 mm(3) to 199.4;;1.88 HV and 0.4476 mm(3), respectively. However, this amount of graphene addition tended to slightly deteriorate the corrosion resistance of Al.Öğe Mechanical and tribological characterization of graphene nanoplatelets/Al2O3 reinforced epoxy hybrid composites(Taylor & Francis Inc, 2023) Kaykilarli, Cantekin; Yeprem, H. Ayguel; Uzunsoy, DenizThis study aimed to determine the effects of varying Aluminum oxide (Al2O3) and Graphene Nanoplatelets (GNP) concentrations on epoxy-based polymer composites' mechanical and tribological characteristics. Al2O3 (1 to 5 wt.%) and GNP (0 to 1 wt.%) reinforced epoxy matrix composites were produced with sonication and stirring magnetic route. Mechanical, microstructural and tribological properties of composites were investigated via X-ray diffraction (XRD), Archimedes' Method, Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDX), Raman spectroscopy, hardness, impact, tensile, compressive and wear tests. The highest ultimate tensile strength and compressive strength were found at 62.83 and 137 MPa for 3 wt.% reinforced Al2O3 epoxy matrix composites, and it was observed that there was a 38% and 17% increase compared to neat epoxy, respectively. The highest impact strength was found for 3 wt.% Al2O3 and 1 wt.% GNP-reinforced composites and increased by 19% compared to neat epoxy. The best hardness was found for 3 wt.% reinforced Al2O3 and 0.25 wt.% GNP-reinforced composite, and there was a 22% increase in hardness compared to neat epoxy. Also, the highest wear resistance (1.686x10(-6) mm(3)/Nm) and lowest Coefficient of Friction (COF, 0.13755) were determined for the same specimen.Öğe Processing and Characterization of Al-4Cu Matrix Composites Reinforced with Few Layered Graphene(Springer India, 2022) Kaykilarli, Cantekin; Kucukelyas, Burak; Akcamli, Nazli; Uzunsoy, Deniz; Cansever, NurhanFew-layered-graphene (FLG)-reinforced Al-4 wt.% Cu matrix composites were produced via the powder metallurgy (PM). FLG was incorporated into the matrix via a mechanical alloying (MA) process conducted for 5, 7 and 9 h in a planetary ball mill. The mechanically alloyed (MA'ed) powders were consolidated by uniaxial pressing and pressureless sintering. Properties of the Al-4Cu-xFLG composites were examined via Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDX), Archimedes method, microhardness, compressive and wear tests. According to the mechanical characterization, FLG addition relatively improved the hardness, whereas it caused the decline of compressive strength. However, the specific wear ratio of the same sample increased by two times compared to the Al-4Cu.Öğe Production and characterization of Al2O3 and CeO2-reinforced titanium matrix hybrid composites(Wiley, 2025) Kaykilarli, Cantekin; Uzunsoy, Deniz; Yeprem, H. AygulTitanium 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.Öğe Role of process control agent in the production of Al2O3-reinforced titanium matrix composites(Elsevier Sci Ltd, 2024) Kaykilarli, Cantekin; Uzunsoy, Deniz; Yeprem, H. AygulMetal 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.Öğe Synergetic effect of functionalized few-layered graphene on structural, magnetic and electrical conductivity properties of CoCuFeNi high entropy alloys(Elsevier Science Sa, 2025) Kucukelyas, Burak; Caha, Ihsan; Kaykilarli, Cantekin; Peters, James Caleb; Solak, Nuri; Uzunsoy, Deniz; Gurmen, SebahattinThis research investigates the integration of functionalized few-layered graphene (FG) into CoCuFeNi high entropy alloys (HEAs), uncovering notable improvements in their structural, magnetic, and electrical properties. By utilizing a functionalization technique with Triton X-100 as a surfactant, the study addresses graphene agglomeration, enhancing FG dispersion within HEAs during the mechanical alloying (MA) process. The impact of different FG concentrations (0.2 %, 1 %, 2 %, 10 % by weight) on HEA properties was examined. FG incorporation refined the microstructure, reducing crystallite size from 19.48 nm to 9.30 nm at 2 wt% FG, while higher concentrations led to a dual-phase FCC and BCC structure. Magnetic properties were modified, with coercivity increasing from 8.53 Oe in the base alloy to 144 Oe at 10 wt% FG, and saturation magnetization decreasing from 90.22 emu/g to 61.48 emu/g. Electrical conductivity also improved. These enhancements indicate the utility of FG-enriched HEAs in applications demanding robust microstructural refinement, magnetic properties, and high electrical conductivity.
