Çolak, Murat; Avci, Ömer; Demir, Muhammet Emin

Quality requirements for aluminum alloys are continuously increasing with technological advancements, driving the need for improved alloy design and casting control. Alloying additions and solidification conditions play a decisive role in determining the microstructural characteristics of cast aluminum alloys. In this study, a commercial A380 aluminum alloy was modified with vanadium (V) additions of 0.03, 0.06, and 0.1 wt.% and cast in step permanent molds with section thicknesses ranging from 5 to 30 mm, enabling a systematic investigation of different solidification conditions. Melting, liquid metal treatment, metallographic preparation, SEM/EDS analysis, density measurements, and solidification modeling were employed. The results demonstrate that vanadium addition and solidification time jointly govern the morphology and distribution of eutectic silicon and intermetallic phases. Under the investigated casting conditions, a V addition of 0.06 wt.% resulted in the most homogeneous microstructure, while higher V content led to the formation of coarser intermetallic phases, particularly at longer solidification times. These findings emphasize the importance of considering the combined effects of alloying and solidification parameters when optimizing the microstructure of A380 aluminum castings for industrial applications.

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Durna, İdris; Çatar, Recep; Altun, Hikmet

The AZ31 alloy was first completely coated with pure aluminum in this study using the electric arc spray coating method. Then, considering the existing benefits of the micro-arc oxidation process (MAO), a ceramic oxide coating was formed by applying MAO to the Al-coated surface. Thus, a duplex coating was obtained on the base material. The structural properties of both the Al-coated samples and the duplex coatings obtained after the MAO process were investigated by scanning electron microscopy, energy-dispersive x-ray analysis (EDS), and x-ray diffraction devices. The electrochemical behavior of the coatings was carried out in a 3.5 wt.% NaCl solution. The samples were polarized from the potential value − 0.2 V below the corrosion potential to the maximum value of 2 V at a scanning rate of 1 mV/s, and potentiodynamic polarization curves were recorded. According to the electrochemical experiments, Al coatings and duplex coatings improved the corrosion resistance of AZ31 alloy. The corrosion current density values ​​were 298.23 µA/cm2 for the base material, 0.415 µA/cm2 for the Al coating, and 0.014 µA/cm2 for the duplex coating, respectively. The best corrosion resistance among all samples was obtained in duplex-coated samples obtained by MAO. Due to their low corrosion resistance, magnesium alloys are restricted in many areas, especially aviation, automotive, and biomedical. Therefore, this study aimed to improve the corrosion resistance of AZ31 magnesium alloy.

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