Effects of Ag Addition on the Precipitation Hardening Behaviour and Properties of Al-Mg-Si Alloys
ZHENG Yaya1,2,3,*, LUO Binghui2, WANG Li1, XIE Wei3
1 College of Energy and Electromechanical Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, Hunan,China 2 College of Materials Science and Engineering, Central South University, Changsha 410083, China 3 Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, Changsha University of Science and Technology, Changsha 410114, China
Abstract: The effects of Ag content on microstructures, intergranular corrosion (IGC), age hardening and precipitation kinetics of Al-Mg-Si alloys were investigated by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), differential scanning calorimetry (DSC) and Vickers hardness test. The results show that at the peak-ageing state, the main strengthening phase is β″ phase in the grain and β′ phase on the grain boundary, while there is a small amount of Al-Fe-Si-(Mn) dispersoid in both grain boundaries and grains. With the increase of Ag content, the peak hardness and age hardening rate increase. Without Ag addition, the density of β′ phase on the grain boundary of the alloy is high, and the corrosion types of the alloy are IGC and local corrosion. The alloy with 0.2% (mass fraction, the same below) Ag has grain boundary β′ phase of low continuity, and shows slight IGC. The addition of excessive Ag leads to the increase of continuity of grain boundary precipitates, and the increase of corrosion sensitivity. The addition of Ag can decrease the strain strength at the interface between MgSi clusters and Al matrix, promote the precipitation of clusters and β″ phase, decrease the precipitation activation energy of β″ phase, significantly accelerate the aging precipitation response of the Al-Mg-Si alloy, and improve the thermodynamic stability of β″ phase.
郑亚亚, 罗兵辉, 汪力, 谢炜. Ag含量对Al-Mg-Si 合金时效析出行为及性能的影响[J]. 材料导报, 2022, 36(13): 20120268-5.
ZHENG Yaya, LUO Binghui, WANG Li, XIE Wei. Effects of Ag Addition on the Precipitation Hardening Behaviour and Properties of Al-Mg-Si Alloys. Materials Reports, 2022, 36(13): 20120268-5.
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2022, Vol. 36 
