Effect of GBCD on IGC susceptibility of solution treated 2024 Al alloy

2nd International Conference on New Material and Chemical Industry

材料科学;化学工业

Li, G.P.^1 ; He, C.L.^1 ; Li, R.^1 ; Shi, J.M.^1 ; Ma, G.F.^1 ; Fu, X.Y.^1 ; Chen, H.Z.^1 ; Wang, J.M.^1

Liaoning Provincial Key Laboratory of Advanced Materials, Shenyang University, Shenyang

110044, China^1

关键词: Al-alloy;    Coincidence site lattices;    Corrosion weight loss;    Electron back-scattered diffraction;    Grain boundary character distributions;    Solution heat treated;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/292/1/012049/pdf
DOI  :  10.1088/1757-899X/292/1/012049

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Grain boundary character distribution (GBCD) of solution heat treated 2024 Al alloy was analyzed by electron backscattered diffraction, and intergranular corrosion (IGC) susceptibility and corrosion weight loss of the 2024 Al were investigated according to ASTM G110-92. The grain boundaries are composed of 12.17% low angle (∑1) boundaries, 10.87% low coincidence site lattice (∑3-∑29) boundaries and 76.96% random (R) boundaries. After corrosion for 6 h, the corroded boundary proportions of ∑1, ∑3, ∑5-∑29 and R boundaries were 10.71%, 11.11%, 21.95% and 25.14%, respectively. This shows that the GBCD has a great effect on IGC susceptibility of the solution treated 2024 Al, and both ∑1 and ∑3 boundaries exhibit much higher IGC resistance than ∑5-∑29 and R boundaries. Among all the boundaries, the R boundaries have the highest IGC susceptibility.