Effect of recrystallization on intergranular fracture and corrosion of Al-Zn-Mg-Cu-Zr alloy

作者：Fang H C^*; Chao H; Chen K H

来源：Journal of Alloys and Compounds, 2015, 622: 166-173.

DOI：10.1016/j.jallcom.2014.10.044

• Grain boundaries
• Corrosion
• Mechanical properties
• Precipitation
• Alloys

The influence of inhibiting recrystallization on intergranular fracture and corrosion behaviour of Al-Zn-Mg-Cu alloy has been investigated by using four independent localized corrosion tests (accelerated IGC, standard EXCO, DCB and U-bending tests), together with detailed microstructural characterization. Results indicated that the intergranular fracture and corrosion resistance of the peak-aged Al-Zn-Mg-Cu-Zr alloy could be substantially improved by inhibiting recrystallization through erbium and chromium additions. The cracking in ultra-high strength Al-Zn-Mg-Cu alloy preferentially propagated along the recrystallized grain boundaries with continuous and coarser grain boundary precipitates. The predominated fracture mode transformed from intergranular fracture to trans-granular fracture by inhibiting recrystallization.

• 单位
  中南大学