Non-isothermal Ageing of an Al-Mg-Si Alloy for Enhanced Anticorrosion Performance

7th Annual International Conference on Materials Science and Engineering

Zheng, Yaya^1 ; Luo, Binghui^1 ; Wang, Shuai^1 ; He, Chuan^1

College of Materials Science and Engineering, Central South University, Changsha

410083, China^1

关键词: Anticorrosion performance;    Comprehensive properties;    Grain boundary precipitate;    Heat treatment process;    Intergranular precipitates;    Maximum sensitivity;    Non-isothermal aging;    Strengthening phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012064/pdf
DOI  :  10.1088/1757-899X/562/1/012064

来源: IOP

【 摘 要 】

The effects of different heat treatment processes on the comprehensive properties of Al-Mg-Si were investigated. The results show that the microstructures changes by T6, T73 and non-isothermal aging (NIA) lead to different hardness and electrochemical properties. The β" strengthening phase of T6 alloy has fine dispersion, uniform size and maximum sensitivity to intergranular corrosion (IGC). The hardness of alloy crystal is the lowest after T73 treatment. The number of β" phases in the crystals of the NIA-treated alloy is the largest, but there is a small amount of coarsened β" phase, and the grain boundary precipitates are intermittently distributed. The IGC sensitivity is the lowest. The NIA-treated alloy has both high strength and good corrosion resistance, which is related to the formation of a large amount of precipitates in the crystal at low temperatures and the growth and coarsening of intergranular precipitates at high temperatures.