Nanocrystallization kinetics and magnetic properties of the melt spun amorphous (Fe_(0.5)Co_(0.5))_(77)Si_(11)B_9Cu_(0.60Nb_(2.4) alloy

摘要

Kinetics of crystallization in an amorphous (Fe_(0.5)Co_(0.5))_(77)Si_(11)B_9Cu_(0.6)Nb_(2.4) (at.%) alloy was investigated using differential scanning calorimetry (DSC). Transformed fraction as a function of temperature was obtained by accurate DSC measurement and the experimental data analyzed with Vyazovkin modelfree kinetic method. Reconstructed form of the experimental kinetics model, g(α), clearly showed the crystallization mechanism do not belongs to a single model but almost follows the Avrami-Erofe'ev. Magnetic coercivity and hysteresis loss values of the annealed samples at 823K were 7.5 Am~(-1) and 1.2 J m~(-3), compared to 17.1 Am~(-1) and 37.1 J m~(-3) for as spun samples. Magnetic measurements show the annealing reduces both coercivity and hysteresis loss at all frequencies.