Modelling particle dissolution and nucleation during the heat
treatment of commercial aluminum alloys
Jos de Zwaan
Site of the project:
1970 CA IJmuiden
start of the project: August 2005
In December 2005 the
Thesis has been appeared
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
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
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
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
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
or melting problem). The second process is modelled by the use of a
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.
- Dissolution of large (primary) particles with a size in the
order of a micrometer;
- Formation (nucleation) and growth of tiny (secondary)
particles with a size in the
order of a nanometer.
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