Effects of Al8Cu4 Er Phase on Corrosion Behavior of Al–Cu–Mg alloy with Er addition
来源期刊：Acta Metallurgica Sinica2020年第10期
论文作者：Wei-Ning Shi Hai-Fei Zhou Xin-Fang Zhang
文章页码：1379 - 1387
摘 要：The effect of Al8Cu4 Er 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 Al8Cu4 Er phase. The Al8Cu4 Er 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 Al8Cu4 Er 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.
Wei-Ning Shi1，Hai-Fei Zhou2，Xin-Fang Zhang1
1. State Key Laboratory of Advanced Metallurgy,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing2. Zhejiang Electric Power Corporation Research Institute
摘 要：The effect of Al8Cu4 Er 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 Al8Cu4 Er phase. The Al8Cu4 Er 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 Al8Cu4 Er 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.
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