Browsing by Author "Civi C."

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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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    The effect of welding on reliability of mechanical properties of AISI 1020 and AISI 6150 steel materials
    (CSIC Consejo Superior de Investigaciones Cientificas, 2021) Civi C.; Iren E.
    Welding is one of the most important manufacturing and repair method of today s technology. Though it is known that it can reduced the mechanical properties of materials, it is a necessity in many areas and in some cases, it is preferred because of the efficient and fast manufacturing. The widespread use of welding has raised the problem of reliability of welded structure. It is important to carry on reliability analysis especially on critical welded constructions or some critical materials. In this study, two steel material (AISI 1020 and AISI 6150) which different weldability levels were selected. Gas metal arc welding (GMAW), Gas Tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) were chosen as widespread industrial welding techniques. Welded and non-welded mechanical properties of these materials were examined taking into consideration the reliability, and effect of welding and welding methods were investigated. Reliability analyzes revealed that non-predictable mechanical properties and microstructures are main characteristic of welding process especially in some materials or methods. © 2021 CSIC Consejo Superior de Investigaciones Cientificas. All rights reserved.