The phase transformations of a metastable crystalline phase obtained under
high pressure occurring upon heating are considered: amorphization and subs
equent crystallization. A model for the kinetics of these processes taking
into account the capability for competitive formation of crystalline and am
orphous phases at the boundaries of the grains of the initial phase is cons
tructed. Expressions for the volume fractions as well as for the nucleation
rates and growth velocities of the phases formed are obtained. Differentia
l scanning calorimetry curves are described. A numerical analysis of the eq
uations of the kinetics and a comparison with the results from experiment a
re carried out with reference to Cd43Sb57 alloy.