Effect of Iron-Rich Phase on Tensile Fracture Morphology of Al-Cu Alloy

The study found that different types of iron-rich phases are hard and brittle phases that are prone to stress concentration during the tensile process, but relatively speaking, the needle-shaped β-Fe phase is more likely to form a crack source, while the compact α (CuFe) phase has a smaller splitting effect on the matrix, so it has less adverse effects on strength and plasticity. When the Mn/Fe ratio is 1.2, the fracture is mainly composed of tiny dimples and tearing edges, showing ductile fracture characteristics, and only the α (CuFe) phase is observed on the cross section.