<![CDATA[This study aims to investigate the effect of adding foundry slag waste from a cupola furnace as a reinforcing particle in Aluminum Metal Matrix Composites (AMMCs) on the casting characteristics of recycled aluminum scrap–based alloys. The cupola slag furnace was added at weight fractions of 2%, 4%, and 6%. The composites were fabricated using the stir casting method, with aluminum scrap frame serving as the matrix and foundry slag as the reinforcement. The aluminum was melted in a gas furnace, and mechanical stirring was initiated 5 minutes before adding the slag into the semi-solid molten metal. After slag addition, stirring was continued for another 5 minutes, followed by the addition of magnesium (Mg) as a wetting agent. The molten composite was then poured into molds to produce test specimens. The experimental evaluation included density measurement, impact toughness testing (J/mm²), and fracture surface observation of the impact-tested specimens. The results revealed that increasing the slag content significantly affected the material’s toughness. At lower concentrations (2–4%), the slag particles were uniformly dispersed within the aluminum matrix and acted as effective micro-reinforcements that hindered crack propagation. However, at higher concentrations (6%), particle agglomeration occurred due to increased surface energy and weakened interfacial bonding, leading to a noticeable decrease in impact toughness.]]>
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