Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 853, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157228
Keywords
Aluminium; Al2Cu; Grain boundary precipitation; Grain boundary misorientation; Intergranular corrosion
Categories
Funding
- UK Engineering and Physical Sciences Research Council [EP/N007638/1, EP/R001715/1]
- Innovative Foundation of Huazhong University of Science and Technology [2018KFYYXJJ124]
- Fundamental Research Funds for the Cornell University [2019KFYXJJS068]
- National Key Petrol Program of China [2016ZX05016002-004]
- EPSRC [EP/N007638/1] Funding Source: UKRI
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In this study, the influence of trace level Cu on intergranular corrosion in AA6082 alloy was investigated using accelerated corrosion testing and high resolution electron microscopy. It was found that Al2Cu precipitates promoted IGC at the grain boundaries.
In the present work, the influence of trace level Cu on intergranular corrosion (IGC) in AA6082 Al-Mg-Si alloy is studied using correlative accelerated corrosion testing and high resolution electron microscopy. Further, grain boundary structure and its correlation to IGC are also investigated using electron backscatter diffraction (EBSD) and transmission Kikuchi diffraction (TKD). It is found that in AA6082-T6 alloy with very low Cu content (0.06 wt%), about 13% of high angle grain boundaries have Al2Cu precipitates, which promotes IGC at the grain boundaries. (C) 2020 The Authors. Published by Elsevier B.V.
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