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Título:
THERMODYNAMIC ASPECTS RELATED TO SOLIDIFICATION OF BINARY ALLOYS
Autor/es:
ALICIA ESTHER ARES; SERGIO FABIÁN GUEIJMAN; CARLOS ENRIQUE SCHVEZOV
Lugar:
Berlin. Alemania
Reunión:
Otro; THE TWELFT INTERNATIONAL SUMMER SCHOOL ON CRYSTAL GROWTH, ISSCG-12; 2004
Institución organizadora:
The Institute of Crystal Growth (IKZ)
Resumen:
In order to achieve improved predictions in a solidification process using mathematical modeling, it is necessary to couple the solidification modeling with an accurate thermodynamic model. In the present report, thermodynamics aspects related to solidification of Lead Tin alloys are considered. Such aspects are; the solidification path, the solid fraction vs. temperature, and the enthalpy and the latent heat evolution. A thermodynamic model including the above phenomena is developed and the values of the associated parameters are calculated, particularly the enthalpy of solid and liquid phases of the alloys in the mushy zone, as a function of temperature and alloy concentration. From the calculated enthalpies, the latent heat released during solidification, which is a key input parameter in any solidification model, can be readily obtained. The total integrated heat released for complete solidification of Lead Tin alloys calculated with the present model is in good agreement with reported data. These calculations are also extended to binary aluminum alloys such as Aluminum-Copper, Aluminum-Magnesium, Aluminum Silicon, Aluminum Lithium and other alloys such as Zinc-Aluminum and Nickel-Zirconium in a range of concentrations. The results show similar behavior of the latent heat as observed in Lead Tin alloys that is, with a larger amount of latent heat being released at the beginning of the alloy solidification. In the present research these results are presented and discussed.