Effect of large deformation conditions on recrystallization microstructure evolution of aluminum-silicon alloy

Abstract

This study investigates the hot deformation behavior and dynamic recrystallization (DRX) mechanisms of 4047 aluminum-silicon alloy, under varying deformation temperatures and strain rates. The results show that the Zener-Hollomon parameter has a significant influence on dynamic softening and microstructural evolution. The presence of silicon particles promotes continuous dynamic recrystallization, driven by subgrain rotation. When 15.26 < lnZ < 17.57, dynamic recovery dominates, whereas at 22.17 ≤ lnZ < 27.37, DRX grains form near grain boundaries and within grains. Lower deformation temperatures and higher strain rates facilitate the formation of finer DRX grains, while higher temperatures and lower strain rates favor dynamic recovery and the development of coarser grains. These findings provide valuable insights for optimizing processing conditions, controlling microstructure, and enhancing the mechanical properties of 4047 aluminum-silicon alloy for industrial applications.