INFLUENCE OF CHEMICAL COMPOSITION ON THE HOT TEARING SUSCEPTIBILITY OF WROUGHT 6005 ALUMINUM ALLOYS

Hot tearing is one of the most critical casting defects that affect the castability of an alloy and the final integrity of a component. Despite being extensively studied over the past 70 years, multiple theories persist regarding the mechanism that control the crack development and the key influencing phenomena. Most of the theories concur that the susceptibility is influenced by factors such as the chemical composition of the alloy, the cooling rate, and the microstructure of the alloy. This work aims to investigate the hot tearing susceptibility of wrought Al alloys. Using the Kou criterion based on thermodynamic calculations, the influence of different levels of alloying elements and impurities, such as Mg, Si, Fe, and Mn on the alloy hot tearing susceptibility has been investigated.Thermodynamic simulation results have shown that variations in the chemical composition of the alloy lead to discrete changes in the hot tearing susceptibility index. Furthermore, the obtained results emphasized the critical role of selecting the solid fraction range, identified as the most vulnerable region for hot cracking formation. This selection proves key role in obtaining results that are reflected in industrial practices. These findings offer insight into the castability of wrought alloys and present a method for optimizing industrial process design.