The kinetics of nanocrystallization and microstructural observations in FINEMET, NANOPERM and HITPERM nanocomposite magnetic materials

This paper presents experimental observations of the nanocrystallization process in materials having Fe-Si (FIN-EMET), alpha-Fe (NANOPERM), and alpha'-FeCo (HITPERM) nanocrystals coupled through an amorphous phase. Crystallization kinetics and chemical partitioning during crystallization are described. Isothermal nanocrystallization is discussed in the framework of the Johnson-Mehl-Avrami-Kolmogorov model and constant heating rate experiments analyzed in the context of the Kissinger model. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.