ENTHALPY VARIATIONS AND LATENT HEAT EVOLUTION DURING SOLIDIFICATION OF LEAD-TIN ALLOYS

S. F. GUEIJMAN; A. E. ARES; C. E. SCHVEZOV

Nashville, Tennessee, USA.

Simposio; LIGHT METALS 2000; 2000

The Minerals, Metals and Materials Society

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 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 the 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 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.