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Metals 2019, 9(3), 310; https://doi.org/10.3390/met9030310

Modeling Electrical Resistivity of Naturally Aged Al–Mg–Si Alloys

1
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2
EEMCS Faculty, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 27 January 2019 / Revised: 23 February 2019 / Accepted: 5 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Heat Treatment of Aluminum Alloys)
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Abstract

Isothermal ageing of Al–Mg–Si alloys, stored at room temperature for more than 5 months, is associated with an unexpected significant increase in the overall electrical resistivity. This unexpected anomalous increase is not observed in alloys with shorter storage (natural ageing) times. This phenomenon is explained with a scenario, based on the evolution of the size distribution of Guinier–Preston (GP) zones during natural ageing and during subsequent artificial ageing. The proposed scenario can explain the contribution of natural ageing atomic clusters to this anomalous increase in the electrical resistivity. A physically based combined precipitation–electrical resistivity model, with the former being based on simultaneous nucleation-growth-coarsening reactions and the latter based on the Bragg scattering of electrons from atomic clusters, has been used to explain the electrical resistivity evolution. It is shown that the proposed model is capable of reproducing the experimental data in both short natural ageing (less than 5 months) and long natural ageing (more than 5 months) regimes. View Full-Text
Keywords: natural ageing; electrical resistivity; Al–Mg–Si alloys; modeling natural ageing; electrical resistivity; Al–Mg–Si alloys; modeling
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Bahrami, A.; Yazdan Mehr, M. Modeling Electrical Resistivity of Naturally Aged Al–Mg–Si Alloys. Metals 2019, 9, 310.

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