Browsing by Author "Eyici G."

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    Wear characteristics of carbon nanotube reinforced Al2024 composites; [Magnezyum oksit ve karbon nanotüp takviyeli Al2024 kompozitlerin aşınma özellikleri]
    (TUBITAK, 2020) Ergul E.; Kurt H.I.; Civi C.; Eyici G.
    Composite materials have high specific strength and modulus of elasticity compared to traditional materials, thus, over the past 10-20 years, the demand for these kinds of materials has increased significantly due to their specific properties. This means, the weight of the machine component produced from these materials can be reduced. In this study, the mold casting method was used in the production of Al 2024 matrix composite materials. In sample production, 50% MgO and 50% MWCNT are mixed by weight and added to the matrix material in the ratio of 0.2%-0.5%-1%-2%. The hardness and wear behaviors of Al 2024 composites with MgO / MWCNT additive were investigated using Rockwell tester and a ball-on-disc wear tester. The effects of composite materials on the wear properties have been investigated by determining the wear weight loss. 5N load and 250 m distance were chosen as the wear test parameters and percent wear amounts of the samples were examined. It was observed that hardness values of samples increased, and the wear percentage of specimens decreased with the addition of reinforcement. The best ratio for the composite design is the mixing of 50 wt.% + MgO 50 wt.% CNT with 1 wt.%. © 2020, TUBITAK. All rights reserved.
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    Rotating bending fatigue behavior of high-pressure diecast AlSi10MgMn alloy based on T5 heat treatment parameters
    (Walter de Gruyter GmbH, 2024) Gülmez C.Ç.; Çivi C.; Eyici G.
    The study investigates fatigue failure, a common phenomenon in machine elements subjected to cyclic stresses. The analysis emphasizes that the actual stress experienced by materials often falls below their tensile and yield strengths due to repetitive variable stresses, leading to fatigue damage. Fatigue life is measured by the number of cycles endured before failure. This paper focuses on the aluminum alloy of AlSi10MgMn, extensively used in manufacturing due to its strength, low density, and corrosion resistance. Experimental procedures encompassed tensile testing, microstructural examination, SEM analysis, and fatigue testing. Tensile tests provided initial stress values for fatigue testing. Microstructure analyses verified that heat-treated samples exhibited precipitates. SEM analysis disclosed microstructural characteristics, while fracture surface examinations demonstrated higher fatigue resistance in heat-treated specimens. Hardness measurements were conducted, with heat-treated samples showing higher values. Theoretical calculations based on stress and cycle numbers were compared to experimental fatigue results. The derived equations aligned well with the tests. Ultimately, the study underlines the importance of heat treatment on material behavior and fatigue resistance, shedding light on alloy performance and durability enhancement. © 2024 Walter de Gruyter GmbH, Berlin/Boston.
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    The Effect of Heat Treatment on The Wear and Corrosion Behavior of AISI 440B Martensitic Stainless Steel in Different Environments
    (Springer, 2025) Saklakoğlu N.; Eyici G.; Aslan N.; Hocalar Ç.; Çimen O.
    This study demonstrates that the austenitization temperature of AISI 440B martensitic stainless steel crucially influences wear and corrosion resistance. As the austenitization temperature increases, Cr23C6 carbides dissolve, leading to increased Cr and C concentrations in the austenite matrix. Higher Cr content enhances corrosion resistance, while increased C content raises hardness. However, excessively high austenitization temperatures result in increased retained austenite due to lowered Mf temperatures and grain coarsening, which significantly reduces hardness. Electrochemical corrosion tests that have been done in wet wipe solution and NaCl solution have shown that a high carbon content can break the martensitic crystal lattice, destabilizing the protective oxide film and reducing corrosion resistance. This study identifies 1110 °C as the optimal austenitization temperature for AISI 440B martensitic stainless steel, balancing both wear and corrosion resistance effectively. © The Indian Institute of Metals - IIM 2025.