Optimum and Rapid Annealing of Nanocrystalline Fe73.5Cu1Nb3SixB(22.5-x) Ferromagnets-Correlation Between Magnetic, Mechanic and Thermal Analysis

In this paper we discuss the optimal and rapid treatment of Fe73.5Cu1Nb3SixB22.5-x nanocrystalline alloy. In order to define an optimisation parameter of the coupled temperature/annealing time, several treatments of two alloys (x=13.5% and x=15.5%) have been studied. A rapid annealing (630 ○C with no step) which gives rise to better magnetic properties is proposed. It is shown that the alloy containing 15.5% of silicon is mechanically stronger when rapidly treated. Finally, it is attempted to correlate magnetic, mechanical and thermal analysis showing also how this can help to gain insight into magneto-mechanical coupling through amorphous and crystalline phase.