In this study, the effect of Al5Ti1B grain refiners and Al10Sr modifiers on the mechanical and corrosion properties of the A360 aluminum alloy was investigated. For this purpose, varying amounts of Al5Ti1B grain refiner and Al10Sr modifier were added to the molten A360 alloy and the molten metal was poured into a per-manent mold. Subsequently, microstructural investigations, hardness test, tensile strength and corrosion resistance of the samples were examined. The results showed that, the Al5Ti1B grain refiner promotes finer-grained and coaxial solidifi-cation. The Al10Sr modifier, broke down the eutectic particles in the microstruc-ture and caused a more homogeneous distribution in the structure. While the tensile strength and corrosion resistance of the alloy increased both the grain refiner and the modifier added to the A360 alloy, a slight decrease in hardness was observed in the alloys to which only the modifier was added.

Aluminum casting alloys are widely utilized today, particularly in the automotive sector, in line with the pursuit of designing lightweight and energy-efficient vehicles. This widespread application is attributed to their advantageous properties, such as low density, high corrosion resistance, high strength, and superior thermal and electrical conductivity. Porosity, which is one of the most common problems in the products produced by the casting method, renders the product unusable. Since directional solidification is unidirectional heat flow, the effects of solidification parameters, such as temperature gradient, solidification time, solid-liquid interface velocity, on porosity, can be investigated. In this study, the effects of the temperature gradient, solidification time, solid-liquid interface velocity parameters on pore formation were investigated in the one directionally solidified AlSi10Mg alloy at different solidification parameters. Density analysis and microscopic image analysis methods were used according to Archimedes' principle to measure porosity in the samples. When the results obtained are examined one by one, it is seen that the increase in temperature gradient decreases the porosity. However, it has been detected that porosity increases with increasing solid-liquid interface velocity and solidification time. A mathematical model was developed using regression analysis to predict porosity formation with R² = 0.857, showing good correlation between solidification parameters and porosity formation.

This study investigates the decisive role of boron content (0–30 at. %) in the microstructural evolution, phase competition, and tribological performance of Fe-Cr-V-C-B-based hard cladding coatings applied to S235 steel using TIG welding. The integration of experimental characterization (SEM/EDS, XRD) with computational Scheil-Gulliver simulations has revealed the effect of unstable solidification conditions on material behavior. Increasing boron concentration triggered a sharp morphological transition in the matrix structure from a hypoeutectic dendritic form (0B-V) to fine eutectic networks and, ultimately, to a hyper-eutectic composite dominated by coarse-grained VB and M2B primary borides at the 30 at. % B level. The rapid cooling rates characteristic of TIG welding kinetically favored the nucleation of the VB phase, which has a simpler crystal structure, and suppressed equilibrium phases requiring long-range diffusion. This microstructural strengthening provided a linear increase in hardness values from approximately 575 HV to 900 HV; consequently, the resulting rigid boride network formed an effective barrier against the micro-plowing mechanism, reducing the wear rate by approximately 54%. However, tribological analyses showed that a balance between performance parameters must be maintained: while the addition of 30 at. % B maximized hardness, it triggered structural brittleness and third-body wear, increasing the friction coefficient to 0.42. The results confirm that 20 at.% B is the optimal concentration in terms of wear resistance (µ=0.42) and toughness balance and validate Scheil modeling as a reliable prediction tool for alloy design under rapid solidification conditions.

Bu çalışmada Etial 180 alaşımı içerisine ağırlıkça %0-5 oranında bakır ilavesi gerçekleştirilmiştir. Üretilen numunelerin mikroyapısal incelemeleri, sertlik testleri ve korozyon dirençleri ölçülmüştür. Çalışmada bakır ilavesinin Etial180 alaşımının mikroyapısında önemli değişikliklere neden olduğu gözlemlenmiştir. Artan bakır oranı ile mikroyapıda Al2Cu faz yoğunluğunun arttığı görülmüştür. Sertlik testi sonucu Etial180 alaşımına ilave bakırın alaşımın sertliğinde doğrusal bir artışa neden olduğu tespit edilmiştir. Çalışmada en yüksek sertlik değeri ağırlıkça %5 bakır içeren alaşımda 80.2 HB olarak ölçülmüş ve referans numuneye göre sertliği %22 oranında artırdığı tespit edilmiştir. Döküm numunelere gerçekleştirilen potansiyodinamik polorizasyon testi sonucu artan bakır oranının korozyon potansiyellerinde önemli bir değişime neden olmadığı tespit edilmiş fakat akım yoğunluğu değerlerinin genel olarak artan bakır oranı ile arttığı görülmüştür. Çalışmada en düşük korozyon direnci %5 bakır içeren numunede ölçülmüştür.