Correlation of texture and intergranular corrosion in Al-Mg 5xxx series alloys

17th International Conference on Textures of Materials

材料科学;物理学

Engler, O.^1 ; Hentschel, T.^1 ; Brinkman, H.-J.^1

Hydro Aluminium Rolled Products, RandD Bonn, PO Box 2468, Bonn

D-53014, Germany^1

关键词: Al-Mg alloy;    Critical applications;    Crystallographic textures;    Exposed to;    Grain boundary character distributions;    Grain size;    Local Texture;    Series alloys;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012111/pdf
DOI  :  10.1088/1757-899X/82/1/012111

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Aluminium-alloys of the AA 5xxx series with Mg contents in excess of 3% may suffer from intergranular corrosion (IGC) when exposed to temperatures in the range 60 to 200°C. At these temperatures Al-Mg alloys are rendered susceptible to IGC by precipitation of β-Al8Mg5phases along the grain boundaries. Accordingly, susceptibility to IGC will depend on grain size as well as type and orientation of the grain boundaries present in the material, that is, on the crystallographic texture of the material at final gauge. Therefore, it is of great interest to study the correlation of texture and precipitation of β-AlMg phases and, therewith, susceptibility to IGC. For this purpose, different AA 5182 samples were processed so as to produce different crystallographic textures and characterized with respect to microstructure and resistance against IGC. EBSD local texture analysis was applied to provide information about the grain boundary character distribution. Eventually, this may enable Al industry to reduce the susceptibility of Al-Mg alloys to IGC by proper control of the final gauge texture, such that higher Mg-contents may be used in IGC-critical applications.