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A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys

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Abstract

A physically based model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu (7xxx series) alloys is presented. The model includes calculations of the η- and the S-phase solvus (using a regular-solution model), taking account of the capillary effect and η coarsening. It takes account of the conductivity of grains (incorporating dissolved alloying elements, undissolved particles, and precipitates) and solute-depleted areas at the grain boundaries. Data from optical microscopy, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) with energy-dispersive X-ray spectrometry (EDS), and transmission electron microscopy (TEM) are consistent with the model and its predictions. The model has been successfully used to fit and predict the conductivity data of a set of 7xxx alloys including both Zr-containing alloys and Cr-containing alloys under various aging conditions, achieving an accuracy of about 1 pct in predicting unseen conductivity data from this set of alloys.

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Author notes

  1. X. M. Li (Ph.D. Student, Research Fellow)

    Present address: the Materials Research Group, School of Engineering Sciences, University of Southampton, SO17 1BJ, Southampton, United Kingdom

Authors and Affiliations

  1. the Materials Research Group, School of Engineering Sciences, University of Southampton, SO17 1BJ, Southampton, United Kingdom

    M. J. Starink (Reader)

  2. the Department of Dental Materials Science, King’s College London, SE1 9RT, London, United Kingdom

    X. M. Li (Ph.D. Student, Research Fellow)

Authors
  1. M. J. Starink
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  2. X. M. Li
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Starink, M.J., Li, X.M. A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys. Metall Mater Trans A 34, 899–911 (2003). https://doi.org/10.1007/s11661-003-0221-y

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  • DOI: https://doi.org/10.1007/s11661-003-0221-y

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