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 Al8Cu4 Er 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.
基金
financially supported by the National Natural Science Foundation of China(Nos.51874023,51601011 and U1860206)
the Fundamental Research Funds for the Central Universities,Recruitment Program of Global Experts
the State Grid Scientific
Technological Research Program of China(No.5211DS17001X)。
