Zagorulko I. Formation of metastable crystalline, conditionally and truly amorphous structures under rapid cooling of melts

The object is the physical regularities of the structuring processes in non-equilibrium conditions of quenching from the liquid state, as well as the heat treatment of QLS products. The purpose is the analysis of the mechanisms and kinetics of the formation of metastable crystalline phases, as well as factors responsible for the suppression of crystallization at the rapid cooling of metal melts. Methods – the calculate-theoretical analysis of structure formation processes, X-ray diffraction, optical and raster electronic microscopy, measurements of specific electroresistance, differential scanning calorimetry. Experimental determinate of concentration ranges and thermal modes of formation of single-phase and two-phase nanocrystalline structures in the La-Ag system alloys. The improve model of competitive crystallization of lanthanum with the participation of two equilibrium and metastable modifications is proposed. On an example of alloys with a significantly different glass-forming ability, a complex approach to the analysis of the conditions for partial and complete suppression of crystallization is realized. The principal possibility of complete suppression of crystallization processes is proved and the critical values of technological factors that provide the formation of truly amorphous states deprived of crystalline phase inclusions, are determined. Sphere - educational process, research in the field of non-equilibrium phase transformations.