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Title: Corrosion behaviour of banded microstructure within nugget of friction stir welds in AA2024-T351
Authors: M. Jariyaboon
A. J. Davenport
R. Ambat
B. J. Connolly
S. W. Williams
D. A. Price
University of Birmingham
Mahidol University
Danmarks Tekniske Universitet
BAE Systems plc
Cranfield University
Keywords: Engineering;Materials Science;Physics and Astronomy
Issue Date: 1-Jan-2011
Citation: Materials Science and Technology. Vol.27, No.1 (2011), 208-213
Abstract: Corrosion behaviour of the banded structure known as 'onion ring' in the nugget of friction stir weld AA2024-T351 was investigated to find the relation to microstructure. A micro-electrochemical cell with a 50 μm diameter glass pipette tip was used for electrochemical measurements. It was found that onion rings consisted of two bands: 'dark' bands that contain fewer constituent particles but show extensive precipitation of S phase and 'light' bands that contain fewer S phase precipitates but greater numbers of constituent particles. Electrochemical results showed that the light band has more noble (less active) open circuit potential compared to the dark band. Microstructurally, this is due to the lower number of S precipitates and therefore the possibility of higher Cu solid solution within the band compared to that of the dark band. © 2011 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute.
ISSN: 17432847
Appears in Collections:Scopus 2011-2015

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