Abstract: The effect of Mg and Si content with fixed Mg/Si ratio on the microstructure and properties of Al-Mg-Si alloy was investigated by mechanical properties testing, intergranular corrosion and electrochemical polarization curve, combined with SEM, EDS, TEM techniques. The experimental results indicate that increasing content of Mg and Si from 0.6wt% and 0.56wt% to 1.6wt% and 1.49wt% can improve mechanical property by promoting the precipitation of metastable β″ precipitates. Continuing to increase the content of Mg and Si can coarsen the MgSi phase which would crack easily under stress and lead to the decline of mechanical property. The corrosion resistance of Al-Mg-Si alloy is in inverse proportion to the content of Mg and Si associated with the density of the second phase. Corrosion always occurs in second phase or the matrix around them, while the quantity of second phase is in direct proportion to the element content, which means the alloy with higher content of Mg and Si is more susceptible to be corroded.
任智炜, 罗兵辉, 郑亚亚, 高阳, 何川. Mg、Si含量对Al-Mg-Si合金显微组织与性能的影响[J]. 材料导报, 2019, 33(18): 3072-3076.
REN Zhiwei, LUO Binghui, ZHENG Yaya, GAO Yang, HE Chuan. Effect of Mg and Si Content on Microstructure and Property of Al-Mg-Si Alloy. Materials Reports, 2019, 33(18): 3072-3076.
Liu C H, Lai Y X, Chen J H, et al. Scripta Materialia, 2016,115,150.
[5]
Jin S X, Ngai T, Zhang G W,et al. Materials Science & Engineering A, 2018, 724,53.
[6]
Ninive P H, Strandlie A, Gulbrandsen-dahl S, et al. Acta Materialia, 2014, 69,126.
[7]
Eckermann F, Suter T, Uggowitzer P J, et al. Electrochimica Acta, 2008, 54(2),844.
[8]
Gupta A K, Lloyd D J, Court S A. Materials Science & Engineering A, 2001, 316(1),11.
[9]
Zeng F L, Wei Z L, Li J F, et al. Transactions of Nonferrous Metals So-ciety of China, 2011, 21(12),2559.
[10]
Wang J, Luo B H, Zheng Y Y. et al. The Chinese Journal of Nonferrous Metals, 2017, 27(6),1091(in Chinese).王姣, 罗兵辉, 郑亚亚, 等.中国有色金属学报, 2017, 27(6),1091.
[11]
Xu X X, Zhao Y, Ye Y L, et al. Materials Characterization, 2016, 119,114.
[12]
Cui Y X, Wang C L. Metal fracture analysis, Harbin Institute of Techno-logy Press, China, 1998(in Chinese).崔约贤, 王长利. 金属断口分析, 哈尔滨工业大学出版社, 1998.
[13]
Hou D D, Shan J Q, Cao G H, et al. Heat Treatment of Metals,2017,42(10),209(in Chinese).侯丹丹,单际强,曹国华,等.金属热处理, 2017,42(10),209.
[14]
Zhang S S. Study on microstructure and homogenization treatment of semicontinuous casting ingot of Al-Mg-Si aluminium alloys. Master’s Thesis, Northeastren University, China,2011(in Chinese).张珊珊. Al-Mg-Si合金铸态组织及其铸锭均匀化处理研究.硕士学位论文,东北大学,2011.
[15]
Sang Y, Cheng J H, Liu C H, et al. Journal of Chinese Electron Microscopy Society,2012, 31(5),384(in Chinese).桑益, 陈江华, 刘春辉,等. 电子显微学报, 2012, 31(5),384.
[16]
Liao H, Wu Y, Ding K. Materials Science & Engineering A, 2013, 560(1),811.
[17]
Ding L P, Jia Z H, Liu Y Y, et al. Journal of Alloys and Compounds, 2016, 688,362.
[18]
Li J F, Zheng Z Q, Li S C, et al. Corrosion Science, 2007,49(6), 2436.