Within the scope of this study, it was aimed to use AA7075 aluminum alloy as matrix material and SiC and GNP as reinforcement elements. In order to minimize the possible thermal damage of the reinforcement elements at high temperatures, to prevent the formation of the Al4C3 phase at the SiC/Al interface, and to prevent wetting and homogeneous dispersion problems that may occur between the AA7075 matrix and the reinforcement elements, a mechanical alloying method was used, unlike traditional methods. With the applied mechanical alloying method, nano-sized materials were produced due to the continuous deformation, breaking, cold welding, re-breaking and then welding processes occurring in the powder particles. Each fabricated sample was examined by microstructure characterization, X-ray diffraction (XRD) analysis, particle size analysis and scanning electron microscopy (SEM/EDS) analysis. The materials were characterized regarding their mechanical behavior by applying microhardness tests. As a result of the XRD and SEM/EDS analyzes of the composite materials obtained as a result of the application, it was seen that an undesirable Al4C3 phase was formed in the composite material structure, as the amount of reinforcement increased, the amount of agglomeration in the structure increased and accordingly the porous structure increased, and the hardness value decreased. When the mechanical properties of the obtained composites were examined, it was found that the best result in hardness value was obtained with 15% SiC reinforcement by weight, but there was a significant decrease in hardness value with the increase in the amount of GNP reinforcement.
Anahtar Kelimeler: Al7075, Hybrid composite, Hardness
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