CRYSTALLIZATION KINETICS

Avrami's treatment of nucleation and growth kinetics considers that ac tive nucleation sites are randomly distributed throughout the volume a nd that grains may impinge upon grains grown from other sites, causing growth to cease on the common interface. This treatment resulted in t he well-known Avrami equation. As a result of the reassessment of thes e basic assumptions, an integral equation is proposed for the time-dep endence evaluation of the transformed phase volume fraction in crystal lization processes, instead of the Avrami equation. The proposed model fits very well the whole range of experimental data for NiZr2 and Te9 2Pb8 amorphous to crystalline transformation.