Modelling particle dissolution and nucleation during the heat treatment of commercial aluminum alloys
Jos de Zwaan

Site of the project:
Postbox 10.000
1970 CA IJmuiden

start of the project: August 2005

In December 2005 the Interim Thesis has been appeared and a presentation has been given.

The Master project has been finished in August 2006 by the completion of the Masters Thesis and a final presentation has been given. For working address etc. we refer to our alumnipage.

Summary of the master project:
Inhomogeneities in the microstructure of commercial aluminum alloys are the main cause for heat-cracks, orange-skin metallic surfaces and many other material failures. Therefore, the alloys are subject to a thermal treatment at a high temperature just beneath the melting temperature in order to taylor the microstructure in terms of particles. During this heat treatment two important processes, among other processes, take place: The primary and secondary particles have a different composition. The purpose of this MSc project is to model the combination of the two abovementioned processes. The first process is modelled as a Stefan problem, which is a diffusion problem (like a heat problem) with a moving boundary (compare with a solidification or melting problem). The second process is modelled by the use of a concentration dependent nucleation rate from thermodynamic principles. The problems are coupled by the addition of a reactive term to the Stefan problem resulting from a mass-balance. The combination of the two models is a novelty in the modelling of dissolution of primary particles combined with nucleation of tiny secondary particles.

Contact information: Kees Vuik

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