Effects of Al8Cu4Er Phase on Corrosion Behavior of Al-Cu-Mg alloy with Er addition

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2020,（10）
• 页码范围: 1379-1387
• 页数: 9页
• 语种: 英文

摘要

The effect of Al8Cu4Er phase on the corrosion behavior of Al-Cu-Mg alloy with rare earth Er addition in an under-aging state was studied.The results revealed that the addition Er into the Al-Cu-Mg alloy induced the formation of Al8Cu4Er phase.The Al8Cu4Er phase can significantly refine the grains during recrystallization,thereby suppressing the continuous precipitation of S-phase at grain boundaries and improving the resistance to intergranular corrosion.Conversely,the corrosion susceptibility of local regions around the Al8Cu4Er phase with large dimension was higher than that of the AlCuFeMnSi phase,but weaker than that of θ phase,resulting in decreased pitting corrosion resistance.