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Quantitative TEM study of hardening precipitates in 6XXX aluminum alloys

Published online by Cambridge University Press:  17 November 2003

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Abstract

Hardening precipitation in an intergranular-corrosion desensitized alloy, AA6056-T78, is characterized in comparison with that in AA6013 and AA6082 alloys. To extract quantitative information, image-analysis is applied to dark-field images and selected-area diffraction patterns, along with standardless EDX spectroscopy. The central result is that both needle-shaped and lath-shaped precipitates have a similar chemical composition (except for Al content remaining undetermined in this study) to each other and, furthermore, to that of most of the grain boundary precipitates, normally in a more advanced state of precipitation kinetics than those in the grains.

Type
Research Article
Copyright
© La Revue de Métallurgie, 2003

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