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Effect of an electric field applied during the solution heat treatment of the Al–Mg–Si alloy AA6022 on the subsequent natural aging kinetics

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Abstract

The influence of a dc electric field E = 5 kV/cm applied during the solution heat treatment (SHT) of the Al–Mg–Si alloy AA6022 at 475–552 °C on the subsequent natural aging kinetics was determined employing resistivity. It was found that the increase in the as-quenched resistivity which resulted from application of the field during SHT was retained throughout the natural aging process. An Avrami-type analysis of the natural aging kinetics gave n avg. = 0.3 and k avg. = 5 × 10−2 (min−1)0.3. These values are in qualitative accord with those determined for the Al–Mg–Si–Cu alloy AA6111.

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Acknowledgements

This research was supported by the U.S. Army Research Laboratory and the U.S. Army Research Office under Contract No. DAA19021-0315 with Dr. William Mullins as contract monitor. The authors also wish to thank Ms. R. O’Connell for typing the manuscript, Dr. Robert Ramage, Alcoa Technical Center, for providing the AA6022 specimens and Dr. David Lloyd of Novelis Global Technology Centre, for performing the chemical analysis.

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  1. Materials Science and Engineering Department, North Carolina State University, Raleigh, NC, 27695-7907, USA

    Hans Conrad & Kang Jung

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  1. Hans Conrad
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  2. Kang Jung
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Correspondence to Hans Conrad.

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Conrad, H., Jung, K. Effect of an electric field applied during the solution heat treatment of the Al–Mg–Si alloy AA6022 on the subsequent natural aging kinetics. J Mater Sci 42, 1299–1303 (2007). https://doi.org/10.1007/s10853-006-0850-9

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  • DOI: https://doi.org/10.1007/s10853-006-0850-9

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