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mMINING METALLURGY MATERIALS<br />
m m<br />
WWW.UNILEOBEN.AC.AT<br />
Wissenschaftliche Zusammenarbeit mit:<br />
Prof. F. D. Fischer<br />
Institut für Mechanik, <strong>Montanuniversität</strong> <strong>Leoben</strong>.<br />
Prof. M. Militzer<br />
Dofasco Chair in Advanced Steel Processing,<br />
The University of British Columbia, Canada.<br />
Prof. M. Rettenmayr<br />
Professur für Metallische Werkstoffe, IWT,<br />
Friedrich-Schiller Universität Jena, Deutschland.<br />
Schmelz- und Erstarrungskinetik<br />
in binären Systemen<br />
Dr. J. Svoboda<br />
IPM, Brno, Academy of Sciences of the Czech Republic.<br />
Referenzen:<br />
[1] M. Rettenmayr, O. Warkentin, M. Rappaz, H. E.<br />
Exner: Acta mater 2001;49:2499-510.<br />
[2] J. Svoboda, E. Gamsjäger, FD. Fischer, P. Fratzl: Acta<br />
mater 2004;52:959-67.<br />
Literatur zum Poster:<br />
E. Gamsjäger, J. Svoboda, F. D. Fischer, M.Rettenmayr:<br />
„Kinetics of solute driven melting and solidification“<br />
submitted to Acta mater.<br />
Ernst Gamsjäger<br />
Institut für Mechanik<br />
an der MUL seit: 1998<br />
Zur Person:<br />
Technische Physik (TU Graz), Dissertation am Institut für<br />
Mechanik (MU <strong>Leoben</strong>).<br />
Universitätslehrerverband der<br />
<strong>Montanuniversität</strong> <strong>Leoben</strong> (<strong>ULV</strong>)<br />
Abstract:<br />
Rettenmayr et al. [1] investigated solute driven<br />
melting in the Al-Mg-system experimentally. The<br />
assumption of local equilibrium at the moving solid/<br />
liquid interface predicted melting rates that are significantly<br />
lower than those determined experimentally.<br />
A recently developed thermodynamic model [2] has<br />
been applied to describe the kinetics of the melting<br />
process. By means of this sharp interface model,<br />
which is based on the principle of maximum Gibbs<br />
energy dissipation, additional insight into the underlying<br />
physics is provided. The features of the melting<br />
and resolidification process can be described by<br />
considering both diffusion processes in the bulk and<br />
inter facial reactions. It is shown that, except for a<br />
short initial transient stage where the kinetics of melting<br />
is controlled by interfacial reactions, the process<br />
is diffusion and convection controlled.<br />
Forschungsschwerpunkte:<br />
Diffusion in Mehrkomponentensystemen<br />
Phasenumwandlungen in Festkörpern<br />
Fest / flüssig - Phasenumwandlungen
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