V. D. Aleksandrov, A. P. Zozulya, A. Yu. Sobolev
ABSTRACT
Based on the information obtained during the decoding of the thermograms of heating and cooling of simple substances, the cluster-coagulation model of supercooled melts crystallization has been further developed. Three successive stages of solidification are described in detail: nucleation, coagulation of nucleus and isothermal crystallization. Equations are proposed for calculating the various kinetic and thermodynamic parameters of crystallization (temperature and melting enthalpy and crystallization, incubation period of a new phase nucleation, degree of pre-crystallization supercooling, time and velocity of explosive crystallization, time and velocities of phase transformations etc.). Using the characteristics of the crystallization process found using thermograms, the critical dimensions of the crystal nuclei and the work of their formation, the degree of crystallinity, the nucleation constants and the Avrami parameters, the energy of coagulation of the nucleus, the isothermal precrystallization constants etc.
KEYWORDS:
crystallization, melting, nucleation, thermal analysis, thermogram, supercooling, tin.