Non-isothermal crystallization kinetics and soft magnetic properties of the Fe67Nb5B28 metallic glasses

Differential scanning calorimetry (DSC) was used to investigate the thermal behavior and non-isothermal crystallization kinetics of the Fe 67 Nb 5 B 28 metallic glasses prepared by melt-spinning method. DSC traces exhibit that the crystallization takes place through a single exothermic reaction, and it processes a good thermal stability in thermodynamics. The activation energies for nucleation and grain growth processes were calculated to be 536 ± 22 and 559 ± 20 kJ mol −1 by Kissinger equation, respectively, and 551 ± 24 and 574 ± 20 kJ mol −1 by Ozawa equation, respectively. It means that the grain growth process is more difficult than the nucleation process. The variation of local Avrami exponent n ( x ) with crystallized fraction x demonstrates that the crystallization mechanism varies at different stages. The n ( x ) is larger than 2.5 at the initial stage of 0