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    Change in Si morphology by T6 heat treatment and its effect on tribological properties of Al-Si alloys
    (Springer Heidelberg, 2026) Ozaydin, Merve; Dispinar, Derya; Uludag, Muhammet
    The effect of heat treatment on microstructural and mechanical properties of three different Al-Si alloys was investigated. Both sand and permanent molds were used to produce Al7Si, Al-12Si and Al-17Si alloy samples. Changes in microstructure, hardness, wear and surface roughness were evaluated. In T6 heat treatment, two different temperatures (425 degrees C and 500 degrees C) and three different durations (5, 15, and 30 h) were selected, and after quenching, aging was carried out at 190 degrees C for 16 h. It was found that increasing the heat treatment temperature and duration resulted in smaller silicon phases for all three alloys. This case positively affected the hardness, wear and surface roughness of the alloys. The best parameter for the morphology of Al7Si and Al-12Si alloys in sand casting samples was 500 degrees C solution temperature and 30 h. 425 degrees C solutionizing temperature was found to be insufficient for Si modification.
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    Effects of Grain Refinement, Eutectic Modification, and T6 Heat Treatment on Tribological Properties of Al8Si3Cu Alloys
    (Springer India, 2026) Gurtaran, Mikdat; Uludag, Muhammet
    In this study, the effects of grain refinement and eutectic modification on the wear behaviour of Al8Si3Cu cast alloys produced both before and after degassing were investigated in detail. Grain refinement and eutectic modification were conducted by adding AlTi5B1, Al3B, and AlSr15, respectively. Following the casting process, half of the samples were T6 heat-treated to evaluate the impact of heat treatment on their wear rate. Adhesive wear testing was conducted using a steel ball under a load of 3 N, at a speed of 8 mm/s over 20 m in dry and oily mediums. Microstructural characterisation was performed using optical microscopy and scanning electron microscopy. The results revealed that grain refinement enhances wear resistance by reducing the secondary dendrite arm spacing and strengthening the aluminium matrix. Conversely, while T6 heat treatment significantly promotes the precipitation of secondary phases and intermetallic compounds, improving wear resistance, it also results in more superficial wear on T6-treated samples, which can be attributed to insufficient surface wettability during the solution treatment stage of T6 heat treatment.
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    Study on mechanical and microstructural properties of advanced high-strength welded sheet metal
    (Balkan Scientific Centre, 2023) Damlacik, Serkan; Baydi, Zerrin; Kupeli, Seda; Kaplan, Duygu; Akan, Rabia şevval; Uludag, Muhammet
    Continuous research is carried out in the automotive industry to decrease the weight of automobile bodies without reducing durability. For this purpose, the use of welding sheet metal is one of the successful techniques. Welded sheets are formed by combining two or more flat materials with different thicknesses and different mechanical properties, using the welding method, before being shaped in order to provide superior properties. This situation requires more attention during the shaping stages. It is important to calculate the pressures to be applied to the welding areas and to apply the shaping steps in a way that will not reduce the material strength. For this reason, the production stages of the dies to be used in the manufacture of these parts are just as important. In this study, an innovative die design is carried out for the production of welded sheet metal. The microstructure and mechanical properties of the welded sheet formed by the die were examined. The effect of the forces applied to the welding areas on the material and the mechanical properties of the materials of different thicknesses were determined. Within the scope of the study, microstructure analysis, hardness and tensile tests were carried out and the results were examined. When the results obtained were examined, it was seen that the strength and hardness values of the samples obtained from the welded area were higher than the other areas. © 2023 by the authors. This work is licensed under a Creative Commons Attribution-Non Commercial 4.0 International (CC BY-NC 4.0) license.