Lysenko A. Kinetics of formation of metastable crystalline and amorphous phases under quenhcing from the melt and laser surface melting

Object - regularities of nonequilibrium metals and alloys crystallisation . The aim - an establishment of interrelations crystallisation kinetics with a thermal regime, parametres of a primary microstructure and processes of metastable structural conditions formation . Methods - the calculate-theoreticall analysis of structure formation processes , X-ray diffraction, optical and raster electronic microscopy, the analysis of Auger electrons spectra , measurements of specific electroresistance, microhardness and resistance to abrasive wear. Within the limitations of approach of effective nucleation and growth speeds of crystals research mass crystallisation kinetics of at rapid cooling of melts. Possibility and thermal regime primary nanocrystallization are defined. The new criteria of metal melts amorphization is offered, its correlation with critical thickness of the layers which are experience noncrystalline solidification, for materials with essentially various glass-forming ability is established. Conditions, a crystal structure and degree of metastability of unknown before polytypes of lungs lanthanides are determined. Experimental proofs, are received, and physical interpretation of a structural heredity effects, and also the leading part of crystallisation in formation of a concentration field which are shown in the conditions of laser chemicothermal processing is given. Sphere - educational process, researches in the field of nonequilibrium phase transformations.