Browsing by Author "Armakan E."

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    Investigation and characterization of inclusions in aluminium cast alloys for automotive industry
    (Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association, 2018) Ozaydin O.; Yagci T.; Kaya A.; Culha O.; Armakan E.
    [No abstract available]
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    Investigation and characterisation of inclusions in aluminium cast alloys for the automotive industry
    (Institute of Cast Metals Engineers, 2019) Ozaydin O.; Kaya A.; Armakan E.; Yagci T.; Culha O.
    'Lightweight materials' are widely used in the automotive industry. Not only the demand for fuel efficiency, but also regulations mandating lower emission values lead automotive manufacturers to increase their use of lightweight materials. Considering the low density, better mechanical properties, easier machinability, corrosion resistance and recyclability, Al-Si based alloys are widely used in automotive components such as wheels. Beside these advantages, disadvantages such as impurities, porosity and grain size play a vital role in terms of mechanical properties and surface quality of aluminium alloys. In this study, inclusions were investigated. The SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy) analysis and elemental mapping methods are preferred in the investigation. All critical areas on the samples were defined and analysed by SEM & EDS methods. © 2019 Institute of Cast Metals Engineers. All rights reserved.
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    Effect of chip amount on microstructural and mechanical properties of a356 aluminum casting alloy
    (Polska Akademia Nauk, 2021) Kaya A.Y.; Ozaydin O.; Yagci T.; Korkmaz A.; Armakan E.; Culha O.
    Aluminum casting alloys are widely used in especially automotive, aerospace, and other industrial applications due to providing desired mechanical characteristics and their high specific strength properties. Along with the increase of application areas, the importance of recycling in aluminum alloys is also increasing. The amount of energy required for producing primary ingots is about ten times the amount of energy required for the production of recycled ingots. The large energy savings achieved by using the recycled ingots results in a significant reduction in the amount of greenhouse gas released to nature compared to primary ingot production. Production can be made by adding a certain amount of recycled ingot to the primary ingot so that the desired mechanical properties remain within the boundary conditions. In this study, by using the A356 alloy and chips with five different quantities (100% primary ingots, 30% recycled ingots + 70% primary ingots, 50% recycled ingots + 50% primary ingots, 70% recycled ingots + 30% primary ingots, 100% recycled ingots), the effect on mechanical properties has been examined and the maximum amount of chips that can be used in production has been determined. T6 heat treatment was applied to the samples obtained by the gravity casting method and the mechanical properties were compared depending on the amount of chips. Besides, microstructural examinations were carried out with optical microscopy techniques. As a result, it has been observed that while producing from primary ingots, adding 30% recycled ingot to the alloy composition improves the mechanical properties of the alloy such as yield strength and tensile strength to a certain extent. However, generally a downward pattern was observed with increasing recycled ingot amount. © 2021 Polish Academy of Sciences. All rights reserved.
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    Investigation of metallurgical properties of Al-Si-Mg casting alloys with integrated computational materials engineering for wheel production; [Investigación de las propiedades metalúrgicas de las aleaciones coladas Al-Si-Mg para la producción de llantas utilizando ingeniería de materiales computacional integrada]
    (CSIC Consejo Superior de Investigaciones Cientificas, 2023) Yağcı T.; Cöcen Ü.; Çulha O.; Armakan E.
    In this study, integrated computational materials engineering, which is one of the new generation approaches in materials science, was used in the production of aluminum alloy wheels by low pressure die casting method. In casting alloys, the efficiency of grain refinement provided by master alloys added to the melt decreases with increasing silicon content of the alloy. In this context, as-cast properties of silicon reduced (Si: 5.0 wt.%) alloys with different Mg ratios (Mg: 3.0, 5.0, 7.0 wt.%) are discussed using integrated computational materials engineering approaches. It has been evaluated whether the examined alloys can be an alternative to the AlSi7Mg0.3 alloy, which is currently used traditionally in the production of aluminum-based wheels, with their microstructural and mechanical properties. The study consists of three stages which are computer-aided production, pilot production, testing and characterization studies. In computer-aided production, original sub-eutectic compositions were determined in types and amounts of alloying elements, alloy designs were realized and a database was created with a computational materials engineering software. Then, low pressure die casting analysis were performed in a virtual environment by transferring these data directly to the casting simulation software. Thus, the microstructural and mechanical properties of the wheel were obtained computationally on the basis of the varying alloy composition. In the second stage, the virtually designed alloy compositions were prepared and sample wheels were manufactured by the low pressure die casting method on an industrial scale. In the testing and characterization phase, spectral analyses, macro and microstructural examinations, hardness measurements and tensile tests were carried out. As a result of this study, it was determined that the studied alloys could be used in the production of wheels by the low pressure die casting method considering the metallurgical properties expected from the wheel. In addition, it is thought that the mathematical design of the material with integrated computational materials engineering approaches before casting simulations will play an active role in the competitiveness and sustainability of the aluminum industry in technological conditions. © 2023 CSIC.