Journal
ACTA MATERIALIA
Volume 58, Issue 18, Pages 5941-5948Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.07.010
Keywords
Aluminum, Corrosion; HR-STEM, Nanostructure, Alloy design
Funding
- Australian Research Council (ARC) Centre of Excellence for Design in Light Metals
- Department of Innovation, Industry and Regional Development of the Victorian Government
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The effect of precipitate size and state on the combinations of yield strength and corrosion pit susceptibility exhibited by a model aluminum alloy Al-2.5Cu-1.5 Mg (wt.%) has been measured for the first time For aging times less than 2 h at 200 degrees C, It is shown that the fine nanoscale precipitates that form strongly affect the yield stress of the alloy but do not contribute to electrochemical heterogeneity that leads to corrosion susceptibility This illustrates that a precipitate size range exists where the usually observed Inverse correlation between strength and corrosion resistance can be broken. At longer aging times, when the precipitates become larger, a three orders of magnitude increase in the pitting rate is observed between aging times of 2 h and 9 h. The step change in pitting rate corresponds with a critical precipitate size lying between similar to 3 nm and 8 nm and it is hypothesized that this size corresponds to a critical size above which it is not possible for the formation of a continuous protective passive oxide film to occur (C) 2010 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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