Effect of annealing temperature on mechanical properties and corrosion resistance of extruded Al-Mg alloy

This study investigates the influence of annealing temperature on the mechanical properties and corrosion resistance of the extruded Al-Mg alloy. The alloy was annealed at various temperatures with a holding time of 1 h. Comprehensive analysis using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and electron backscatter diffraction was conducted alongside mechanical and corrosion tests. Results indicated that recrystallization initiates at 250 degrees C-300 degrees C, accompanied by grain growth and dislocation reduction. Ultimate tensile strength and yield strength declined with increasing annealing temperature; hardness decreased from 86.32 HV to 59.06 HV, and elongation improved from 5.09% to 23.9%. Corrosion resistance analysis revealed that partially recrystallized structures at 300 degrees C exhibited superior resistance compared to fully recrystallized structures. These findings provide valuable insights for optimizing annealing processes to enhance the performance of the Al-Mg alloy in various applications.