In the present work, the heat exchange during the non-equilibrium solidification of eutectic Pb-Sb alloys is measured by differential scanning calorimetry and the structures obtained experimentally analyzed by optical microscopy. Non-equilibrium solidification is monitored by the calorimetric apparatus under continuous cooling conditions. As expected in a solidification process, the onset of crystallization shifts to lower temperatures on increasing the cooling rate. By coupling the continuous cooling experiments with the condensed phase equilibria thermodynamic data, the activation energy for crystal formation is estimated. The microstructure obtained is dependent on the cooling conditions. The solidification processes are simulated by considering the dependence of the nucleation rate on the degree of undercooling and compared to experimental results.
|Journal||Journal de Chimie Physique et de Physico-Chimie Biologique|
|Publication status||Published - 1 Jan 1997|
- Heterogeneous nucleation