期刊
CORROSION SCIENCE
卷 52, 期 12, 页码 4073-4080出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.08.024
关键词
Aluminium; Stress Corrosion
资金
- Monash University at the Centre of Excellence for Design in Light Metals
- Australian Research Council
- Australian Government's Defence Future Capability Technology Centre (DFCTC) initiative
There is little or no correlation between grain-boundary, or matrix, microstructures and stress corrosion cracking (SCC) susceptibility. Grain-boundary microchemistry, especially the copper content of grain-boundary precipitates (GBP) is the most important factor. Further evidence for this is a correlation between the initial open-circuit potential of 'fresh' brittle intergranular fracture surfaces, the copper content of GBP, and the plateau SCC velocities of overaged 7079 and 7075 alloys. Preliminary comparisons of overaged (T7) and peak-aged (T651) material have also been made, and support the view that beneficial effects of overaging on SCC resistance is associated with increasing copper content of GBPs. (C) 2010 Elsevier Ltd. All rights reserved.
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