Effects of Ag addition on the microstructures and properties of Al–Mg–Si–Cu alloys
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第1期
论文作者：Li-zi He Yi-heng Cao Yi-zhou Zhou Jian-zhong Cui
文章页码：62 - 72
摘 要：Effects of Ag addition on the microstructures, aging characteristics, tensile properties, electrochemical properties, and intergranular corrosion（IGC） properties of Al–1.1 Mg–0.8 Si–0.9 Cu–0.35 Mn–0.02 Ti alloy were investigated using scanning electronic microscopy and transmission electronic microscopy. The aging process of Al–Mg–Si–Cu alloys was accelerated by the addition of Ag. The strength of peak-aged Al–Mg–Si–Cu alloys was enhanced by Ag addition because of the high density of β″-and L-phase age-hardening precipitates. The corrosion performance of the Al–Mg–Si–Cu alloy is closely related to the aging conditions and is independent of the Ag content. The IGC susceptibility is serious in the peak-aged alloy because of the continuous distribution of Cu-rich Q-phase precipitates along grain boundaries. Ag addition reduces the size of the grain-boundary-precipitate Q phase and the width of the precipitate-free zone and thus results in decreased IGC susceptibility of Al–Mg–Si–Cu alloys.
Li-zi He1,2，Yi-heng Cao1，Yi-zhou Zhou3，Jian-zhong Cui1,2
1. Key Lab of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University2. School of Materials Science and Engineering,Northeastern University3. Institute of Metal Research,Chinese Academy of Sciences
摘 要：Effects of Ag addition on the microstructures, aging characteristics, tensile properties, electrochemical properties, and intergranular corrosion（IGC） properties of Al–1.1 Mg–0.8 Si–0.9 Cu–0.35 Mn–0.02 Ti alloy were investigated using scanning electronic microscopy and transmission electronic microscopy. The aging process of Al–Mg–Si–Cu alloys was accelerated by the addition of Ag. The strength of peak-aged Al–Mg–Si–Cu alloys was enhanced by Ag addition because of the high density of β″-and L-phase age-hardening precipitates. The corrosion performance of the Al–Mg–Si–Cu alloy is closely related to the aging conditions and is independent of the Ag content. The IGC susceptibility is serious in the peak-aged alloy because of the continuous distribution of Cu-rich Q-phase precipitates along grain boundaries. Ag addition reduces the size of the grain-boundary-precipitate Q phase and the width of the precipitate-free zone and thus results in decreased IGC susceptibility of Al–Mg–Si–Cu alloys.
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