KINETICS OF THE NONISOTHERMAL PRIMARY CRYSTALLIZATION OF METALLIC GLASSES: NANOCRYSTAL DEVELOPMENT IN Fe_(85)B_(15) AMORPHOUS ALLOY

摘要

The formation of the a-Fe solid solution crystallites in the melt-spun Fe_(85)B_(15) metallic glass under constant rate heating has been studied by X-ray diffraction and differential scanning calorimetry (DSC). The model of nonisothermal primary crystallization kinetics based on combination of Kolmogorov kinetic crystallization equation and the relation between the diffusion-controlled crystal growth on the one hand and the temperature and heating rate on the other has been developed. From the comparison of the experimental and calculated rates of crystallization the values of the model parameters have been estimated and the conditions of the nanoscale structure formation in the alloy investigated have been predicted.