Quasi in situ analytical TEM to investigate electrochemically induced microstructural changes in alloys: AA2024-T3 as an example |
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| Affiliation: | 1. College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;2. Collaborative Innovation Center of Nonferrous Metals Henan Province, Luoyang 471023, China;3. Henan Key Laboratory of Non-ferrous Materials Science & Processing Technology, Luoyang 471023, China;1. Steel Products Research Group 2, POSCO Technical Research Laboratories Pohang Research Lab, Pohang, Gyeongbuk 37859, Republic of Korea;2. Surface Engineering Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 37673, Republic of Korea |
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| Abstract: | A quasi in situ method using a specially developed holder is presented to follow electrochemically induced microstructural changes on a nanometre scale using analytical transmission electron microscopy (TEM). By following a specific specimen area after repeated exposure to oxygen bubbled through aqueous HCl of pH = 3, de-alloying of a grain-boundary precipitate of ∼200 nm was observed by monitoring the changes in the EELS copper L2,3-edge and EFTEM elemental maps. These results, supporting the existing models of de-alloying of copper rich precipitates in aluminium alloys, demonstrate the effectiveness of the quasi in situ specimen holder for analytical TEM studies of corrosion. |
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