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    A novel approach for enhancing the mechanical behavior of additively manufactured metal matrix composite structures: Preliminary investigation
    (Sage Publications Ltd, 2024) Yalcin, Hasan; Abdelmoula, Mohamed; Kaya, Duran; Kucukturk, Gokhan; Pul, Muharrem
    Additive Manufacturing is a promising technique for expanding the boundaries of Metal Matrix Composites. In this study, Powder Bed Fusion (PBF) technique, employing Electron Beam as the heat source, was used to print Ti6Al4V metal matrix in different geometric shapes with a new approach for MMC fabrication. Yttria Stabilized Zirconia (YSZ) powder was then incorporated into these pattern shapes, compacted, and sintered to bind the powder particles together. The findings showed that successful sintering was achieved, resulting in the formation of a flexible interface region, with the circular design achieving the best interface region among all pattern designs. Regarding the mechanical performance evaluation of the developed Metal Matrix Composites, it was found that the mechanical strength was significantly increased with the hexagonal and circular patterns achieving the best results. Future research should pay more attention to further design development for the metal matrix model to achieve outstanding performance and create a new field for Metal Matrix Composites using the developed method.
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    Öğe
    Effect of matrix temperature and powder size on the infiltration height of SiO2-reinforced Al 7075 matrix composites produced by vacuum infiltration
    (Walter De Gruyter Gmbh, 2017) Calin, Recep; Pul, Muharrem; Bican, Osman; Kucukturk, Gokhan
    In this study, the effect powder size and matrix temperature on the physical and mechanical properties of SiO2-reinforced Al 7075 matrix composites were investigated. It was observed that with increasing powder size and temperature, infiltration height was increased. Optimum parameters of full infiltration that were determined for particle size and temperature were d(50) = 150 mu m and 800 degrees C, respectively. It was also observed that the porosity of the produced composites changed in the range of 3.2-14.6%, and the lowest porosity was obtained from the composite having 105 mu m SiO2 particle size. The highest fracture strength (263 MPa) was obtained from the composite produced at a matrix temperature of 800 degrees C and a particle size of 420 mu m. It was concluded that particle size and temperature are effective parameters to reach full infiltration, and this method is more suitable for producing the composites that have high reinforcement volume fractions than conventional casting methods.
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    Investigation of the effect of lubricant properties of carbon nanomaterial in Cu/MWCNT composites on wear
    (Frontiers Media Sa, 2024) Pul, Muharrem; Yilmazel, Rustem; Erten, Mustafa Yasin; Kucukturk, Gokhan; Kaya, Duran; Salunkhe, Sachin; Zumrut, Yavuz
    This experimental study investigated the abrasive wear behaviour of pure copper-based and multi-walled carbon nanotube (MWCNT) doped composites synthesized by the powder metallurgy technique. Composite structures were formed by reinforcing MWCNT at different ratios between 1% and 8% in 99.9% pure copper by powder metallurgy. The microstructures of the nanocomposite samples were analyzed by X-ray diffraction. Then, density and hardness measurements and abrasive wear tests were performed to determine their mechanical properties. The collected data were evaluated with scanning electron microscopy images. It has been determined that copper's nano-sized carbon reinforcement material has a dry lubricant effect up to a specific ratio, reducing wear losses. On the contrary, wear losses increase as the MWCNT reinforcement ratio increases between 4% and 8%. The best results in lowering wear losses were obtained from the sample with 1% MWCNT reinforcement. Depending on the increase in the amount of nanomaterial reinforcement in the composite structure, it was observed that pore formation enlarges with reinforcement agglomeration. It was concluded that the dense porosity in the composite structure neglects the lubricating properties of the MWCNT reinforcement material and increases the wear losses by having a negative effect.