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    THE EFFECT OF THIN SECTION CASTING ON THE HARDNESS AND TENSILE STRENGTH OF GGG40
    (Tanger Ltd, 2014) Genc, Serhan Karaman; Cetinarslan, Cem S.; Ozel, Kaan
    Today, ferrous metals include large part of industry in the world although many non-ferrous metals and other materials discovered. Steel and cast iron are the important ferrous metals because of their mechanical, physical properties and behaviors. After the discovery of the nodular cast iron, it began to burst into prominence. Because, its similarity to steels from the point of mechanical properties and to cast irons in terms of chemical and physical properties. Besides, nodular cast iron has low cost, good castability and convenient machinability property. In this study, GGG40, which is widely used in modern industrial production, was chosen as test material. The test specimens with different diameters 20 mm, 25 mm and 30 mm were prepared by casting. Thin section casting is the fundamental point of this study. Then, tensile tests, brinell tests and spectrum analysis were performed and investigated.
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    New Processing Route for the Production of Functionally Graded 7075 Al/SiCp Composites via a Combination of Semisolid Stirring and Sequential Squeeze Casting
    (Mdpi, 2024) Genc, Serhan Karaman; Taskin, Nilhan Urkmez
    Advanced processing techniques are required to produce functionally graded metal matrix composites due to the metallurgical conditions required during production. In this study, we developed a novel approach for this task by using a combination of two different methods to produce functionally graded 7075 Al/SiCp (5-20 wt.%) composites. The first process was direct semisolid stirring, which was used to prevent particle agglomeration, brittle reaction products, floating or settling of the reinforcements, and poor wettability. The second process was sequential squeeze casting, which enabled liquid diffusion between the two composite layers that were used to produce a functionally graded aluminum matrix composite. Thus, a method was developed to eliminate the problems encountered in the production of particle-reinforced metal matrix composite materials using liquid stirring methods and to produce composite materials with the desired functionally graded structure. The resulting functionally graded material was subjected to spectrometer analyses, density measurements, and metallographic examinations to determine the characteristics of its layers and interfacial zones, as well as to assess the formation of the graded structure. The results indicate the potential of using this new combined manufacturing method, which is efficient and controllable, to produce functionally graded metal matrix composites.
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    PRODUCTION OF FG-AL-MMC BY SEMI-SOLID STIRRING AND SEQUENTIAL SQUEEZE CASTING METHODS
    (Tanger Ltd, 2020) Taskin, Nilhan Urkmez; Genc, Serhan Karaman
    In this study, manufacturing of functionally graded ceramic reinforced aluminum matrix composite materials (FG-Al-MMC) by using direct semi-solid stirring and sequential squeeze casting method has been investigated. As a matrix material Al-7075 and as a reinforcement material SiC ceramic particles have been chosen for composite materials of FGM layers. Aluminum composite mixtures with different reinforcement ratios have been prepared by mechanically mixing SiCp reinforcements into semi-solid aluminum alloy and, FG-Al-MMC's have been produced by pouring the composite mixtures into a mold on top of each other in liquid form where each layer has been solidified under pressure. The partial melting of the previous layer due to the added liquid layer and the applied pressure cause bonding between layers with a transition region. This process has been repeated sequentially until a structure with the desired thickness and features were obtained. The structure formed between the layers with this manufacturing method was investigated by taking samples from different layers and transition regions of FG-Al-MMC. Density analyses, spectrometric analyses and optical analyses were carried out to determine the properties of FG-Al-MMC material. As a result, it is observed that successful production of functionally graded aluminum composite materials by the direct semi-solid stirring and sequential squeeze casting methods is possible.