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


Starink, M.J. and Li, X.M. (2003) A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys. Metallurgical and Materials Transactions A, 34A, (4), 899-911.

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Description/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.

Item Type: Article
ISSNs: 1073-5623 (print)
Related URLs:
Subjects: T Technology > T Technology (General)
T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 22453
Date Deposited: 24 Mar 2006
Last Modified: 14 Apr 2014 09:16
Contact Email Address: M.J.Starink@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/22453

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