The corrosion resistance and mechanical properties of peak-aged AlZnMgCu alloys containing Si and Er elements were investigated with hardness test,tensile test,intergranular corrosion test,exfoliation corrosion test a...The corrosion resistance and mechanical properties of peak-aged AlZnMgCu alloys containing Si and Er elements were investigated with hardness test,tensile test,intergranular corrosion test,exfoliation corrosion test and transmission electron microscopy.The results indicate that peak-aged AlZnMgCuSiEr alloy is strengthened by co-precipitation of η′phases and nano-sized GPB-Ⅱ zones.The yield strength of the AlZnMgCu alloy is increased by 38.5 MPa and the elongation is increased by 4.5%.At the same time,the corrosion resistance of the AlZnMgCuSiEr alloy is enhanced due to the synergistic effect of Er and Si.The maximum intergranular corrosion(IGC)depth decreases from 264.2 to 9.9μm.The fundamental reason is that the co-addition of Si and Er regulates the evolution of precipitated phases in grains and at grain boundaries.展开更多
基金funded by the National Key Research and Development Program of China(Nos.2021YFB3700902,2021YFB3704204,and 2021YFB3704205)the Beijing Lab Project for Modern Transportation Metallic Materials and Processing Technology,China,the Jiangsu Key Laboratory for Clad Materials,China(No.BM2014006)+4 种基金the Doctor Funds of Taiyuan University of Science and Technology,China(No.20222063)the Fundamental Research Program of Shanxi Province,China(No.202303021212216)the Award Fund for Outstanding Doctors in Shanxi Province,China(No.20232045)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province,China(Nos.2022L289,and 2022L280)the Special Project for Transformation of Scientific Achievements,China(No.202204021301025)。
文摘The corrosion resistance and mechanical properties of peak-aged AlZnMgCu alloys containing Si and Er elements were investigated with hardness test,tensile test,intergranular corrosion test,exfoliation corrosion test and transmission electron microscopy.The results indicate that peak-aged AlZnMgCuSiEr alloy is strengthened by co-precipitation of η′phases and nano-sized GPB-Ⅱ zones.The yield strength of the AlZnMgCu alloy is increased by 38.5 MPa and the elongation is increased by 4.5%.At the same time,the corrosion resistance of the AlZnMgCuSiEr alloy is enhanced due to the synergistic effect of Er and Si.The maximum intergranular corrosion(IGC)depth decreases from 264.2 to 9.9μm.The fundamental reason is that the co-addition of Si and Er regulates the evolution of precipitated phases in grains and at grain boundaries.
