Non-isothermal calorimetric determination of precipitate interfacial energies

Equations suitable for computing specific interfacial energies of precipitates dissolving by a first order transformation were developed on the basis of the singularities taking place at the critical temperature,T _c, under equilibrium conditions. These equations employ data which can be determined by differential scanning calorimetry. Also the conditions for reaching dynamic equilibrium of particle volume fraction belowT _c are analysed in terms of a maximum permissible experimental heating rate. The results obtained for disperse order inCu-Al alloys are in good agreement with those expected from the observed particle features.