Anisotropy of mechanical property and microstructure in Mn-free 2324 Al alloy fabricated by powder metallurgy
摘要
2324 Al alloy, known for its high strength, low density, and excellent corrosion resistance, is widely used in the lightweight field of aerospace and automotive. In this work, Mn-free 2324 Al alloy plates were prepared using powder metallurgy, followed by hot extrusion and T39 heat treatment. The effects of grain size, texture, and precipitation on the alloy’s anisotropy were systematically investigated. The mechanical properties along different directions of the 2324 Al alloy were evaluated, including the transverse direction (TD), extrusion direction (ED), and a 45° direction. The results revealed significant difference in mechanical properties due to microstructure variation, with higher tensile strength and yield strength in ED, while superior elongation was exhibited in the 45° direction. The difference is attributed to the crystal grain shape, precipitate distribution, and texture evolution. The study emphasizes the critical role of the S-phase (Al2CuMg) in enhancing strength and plasticity through dispersion strengthening and grain boundary reinforcement. Additionally, recrystallization behavior and texture evolution, including the formation of Goss and cube textures, are found to significantly influence the mechanical performance. The findings provide a comprehensive understanding of the anisotropic behavior in the 2324 Al alloy and offer insights into optimizing the processing for industrial applications.