Akademik Veri Yönetim Sistemi
Arabian Journal for Science and Engineering, 2024 (SCI-Expanded)
This study investigates the effect of current and duration parameters applied during the powder-mixed electrical discharge machining (PMcEDM) on dimensional accuracy, surface roughness, white layer thickness, material removal rate, and surface microstructures of TiB2 and TiB2 + nanographene-reinforced ZK60 Mg alloys produced by hot pressing powder metallurgy. The samples were processed as sink-blind holes by the PMEDM plunge process with different machining currents and times. Scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, microhardness, and profilometer were used to examine the surfaces and cross sections of the PMEDM machined samples. The analysis revealed that adding TiB2 and nanographene to the ZK60 Mg alloy increased the hardness value, resulting in punched holes with higher dimensional accuracy, decreased material removal rates, and white layer thicknesses. However, the reduced electrical conductivity caused by the ceramic TiB2 and non-metallic nanographene and the regional inhomogeneity in microstructure led to the formation of microcracks, voids, and debris on the surface, increasing surface roughness values, increasing the current values and treatment time, resulting in a continuous increase in damage in all samples. ANOVA, Taguchi, and regression analyses were conducted to assess the impacts of process parameters on experimental outcomes. Optimization data confirmed the validity of these experimental studies, demonstrating significant statistical influence from factors such as processing duration (87.58%), current (3.2%), and material (0.3%). Therefore, additive-reinforced ZK60 Mg alloys, which provide higher mechanical properties, can be easily processed using the PMEDM method.