期刊
CORROSION SCIENCE
卷 143, 期 -, 页码 414-427出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.08.033
关键词
Aluminium; Alloy; STEM; Interfaces; Segregation; Intergranular corrosion
资金
- Woodside Energy
The intergranular corrosion (IGC) of an AA7085-T7452 aluminium alloy forging was determined via ASTM G110 exposure, and rationalised with electron backscattered diffraction and transmission electron microscopy. The alloy microstructure, microchemistry and IGC propensity varied depending on the location within the forging, and thus quarter (t/4) and mid (t/2) thicknesses of the forging were explored herein. The number of IGC fissures and mass loss of specimens was lower in the t/2 position, as a result of higher Cu content in grain boundary precipitates, eta-phase, Mg(Cu-x (=) Zn-0.08-0.32(1-x))(y) (=) (1.4-2.8) and (Zn, Cu)-rich eta-phase, Mg(Cu-x (=) Zn-0.2-0.54(1-x))(y) (=) (4.4-8.5) in the t/2 position, whilst the t/4 position contained eta-phase, Mg(Cu-x (=) Zn-0.09-0.31(1-x))(y) (=) (1.7-2.3) and Zn-rich eta-phase, Mg(Cu-x (=) Zn-0.05-0.12(1-x))(y) (=) (4.4-4.5).
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