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.

中文翻译：

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Al 8 Cu 4 Er相对掺Er的Al–Cu–Mg合金腐蚀行为的影响。

研究了Al ₈ Cu ₄ Er相对欠时效添加稀土Er的Al–Cu–Mg合金腐蚀行为的影响。结果表明，在Al–Cu–Mg合金中添加Er诱导了Al ₈ Cu ₄ Er相的形成。Al ₈ Cu ₄ Er相可以在再结晶过程中显着细化晶粒，从而抑制S相在晶界的连续析出，并提高了抗晶间腐蚀的能力。相反，大尺寸的Al ₈ Cu ₄ Er相周围局部区域的腐蚀敏感性高于AlCuFeMnSi相，但小于AlCuFeMnSi相。θ相，导致抗点蚀性降低。