A model for co-clusters and their strengthening in Al-Cu-Mg based alloys: a comparison with experimental data


Starink, M. J. (2012) A model for co-clusters and their strengthening in Al-Cu-Mg based alloys: a comparison with experimental data. International Journal of Materials Research, 8, 942-947.

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Description/Abstract

A model for the thermodynamics of and strengthening due to Cu–Mg co-clusters in Al–Cu–Mg based alloys is analysed and tested. The formulation uses a single interaction enthalpy between dissimilar alloying elements (e.g. Cu and Mg atoms in an Al–Cu–Mg based alloy) combined with the configurational entropy. The metastable solvus in Al–Cu–Mg based alloys is calculated. Recently published small angle X-ray scattering experiments, 3 dimensional atom probe and yield strength data on these type of alloys support the model. The small angle X-ray scattering and hardness experiments, as well as calorimetry experiments, are sensitive to the main free energy (or enthalpy) changes, which are dominated by Cu–Mg bonds formed by the dimers and the local electron densities related to these bonds. 3 dimensional atom probe is less sensitive to dimers, and will detect agglomeration of dimers to form larger clusters.

Item Type: Article
Additional Information: This paper was presented as an invited plenary lecture at the European Conference for Aluminium Alloys, October, 5-7, 2011, Bremen, Germany; the Deutsche Gesellschaft für Materialkunde (DGM) is gratefully acknowledged for providing funding for conference attendance.
ISSNs: 1862-5282 (print)

Keywords: clusters, co-clusters, precipitation, hardening, calorimetry, enthalpy, entropy, yield strength, 2024, aluminium, GPB, Guinier-Preston
Subjects: Q Science > QC Physics
T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
ePrint ID: 176099
Date Deposited: 03 Mar 2011 11:14
Last Modified: 27 Mar 2014 19:22
URI: http://eprints.soton.ac.uk/id/eprint/176099

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