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    EXPERIMENTAL AND NUMERICAL EXAMINATION OF THE WEAR BEHAVIORS OF AA 7075 ALLOY COATED WITH Al-SiC BY USING HOT PRESS SINTERING METHOD
    (World Scientific Publ Co Pte Ltd, 2023) Ballikaya, H.
    This study was carried out to improve the surface of the AA7075 alloy, which does not resist wear. Therefore Al-SiC composite layer on the surface of AA 7075 material was coated with Al+5vol.% SiC powders under 600 degrees C and 100, 120, 140MPa pressure by the hot pressing sintering method. The microstructure of the transition zone between the coating and the substrate material was analyzed by using optical microscopy (OM), energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) techniques. In addition, XRD measurement and microhardness of the coating layer were obtained. Coating surface was also subject to linear reciprocating wear test and coe +/- cient of friction (COF), wear volume, and mass loss were detected. The results have shown that micro-pores between Al and SiC powders reduced by increasing the pressing pressure. However, although there was a reduction in wear volume and mass loss, microhardness values dramatically increased. Wear test was modeled in ANSYS 2021 R2 package program depending on Archard's law and numerical analysis was conducted. As a result of the experimental results and numerical analysis, the volume loss values occurring in the coating area were found to be compatible with each other.
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    Microstructural and wear properties of the Al-B4C composite coating produced by hot-press sintering on AA-2024 alloy
    (Korean Soc Mechanical Engineers, 2021) Ozay, C.; Ballikaya, H.; Dagdelen, F.; Karlidag, O. E.
    In this study, the surface of an AA-2024 alloy was covered with reinforced composite coating using hotpress sintering method. Al and B4C powders were synthesized through mechanical alloying technique and coated on the AA-2024 substrate at different rates. The microstructure of the intermediate transition region formed between the substrate (AA-2024 Al alloy) and the coating layer (Al/B4C MMCs), the microstructure of the Al/B4C metal matrix composites (MMCs) coating, the microhardness, and the adhesive wear resistance of the Al/B4C MMCs coating layer were investigated. It was observed that B4C powders homogeneously dispersed in the microstructure of the Al/B4C MMCs coating layer, moreover, the Al matrix and B4C reinforcement particles were bonded without a gap. It was also determined that an interface bonding occurred between Al/B4C MMCs coating layer and the AA-2024 substrate. Accordingly, it was determined that with the increase of B4C reinforcement particle ratio, the hardness of the coating layer, and the wear resistance increased.