ABSTRACT
This chapter considers each of the methods of obtaining materials with an amorphous–crystalline structure. When crystallisation of amorphous systems is realized under conditions of melt quenching at a rate close to critical, materials with an amorphous–crystalline structure are obtained. Experiments have shown that the ductility of alloys in the transition amorphous–nanocrystalline state, although considerably lower than in the amorphous state, is substantially higher than in the brittle crystalline state. The production of amorphous–nanocrystalline materials by controlled crystallisation has a number of advantages over other methods of obtaining alloys with an amorphous–nanocrystalline structure. In some cases, the amorphous and amorphous–nanocrystalline metallic alloys require additional heat treatment. The processes of crystallisation and nanocrystallisation have considerable thermodynamic differences. The crystallisation kinetics of the amorphous alloys is a result of the effect of thermodynamic factors and kinetic parameters. When analyzing amorphous–nanocrystalline materials, questions arise about their plastic deformation, the possibility of nucleation and propagation of dislocations in them.
