Of course, we are greatly interested in the following question: 'why does the stable boride form in annealing the amorphous ribbon at a relatively low temperature and a long annealing time and the already solidified specimen additional annealing carried out at even higher temperature in the same annealing time does not contain this boride?
the metastable boride was not detected in any conditions of temperature-time treatment of the amorphous ribbons of these alloys.
The question of the formation of the boride and of the composition of this boride at this temperature after increasing the annealing time has not been explained because there was another problem associated with the annealing of the amorphous ribbons.
It was therefore necessary to find a method of annealing the amorphous ribbons which would make it possible to avoid oxidation of the specimen and be capable of reducing greatly the heating and cooling time.
Verification shows that the total heating and cooling time in annealing of the amorphous ribbons in the temperature range 350-600[degrees]C is approximately 30 min.
As already mentioned, in [1, 2] it has been shown that the crystals of the metastable boride precipitate only during the crystallisation of the amorphous ribbons of the composition [Fe.
The monocrystalline state was produced by annealing of the amorphous ribbons.
It can be seen that the first stage of solidification of the amorphous ribbons of this composition takes place exclusively in a narrow temperature range in the vicinity of 490[degrees]C.
Nanocrystalline soft magnetic alloys prepared by devitrification of melt-spun amorphous ribbons are interesting because of their magnetic properties superior to previously used materials, offering large inductions and good temperature stability.
Amorphous ribbons (6 mm wide and about 20 [micro]m thick) of the nominal composition of [Fe.
Other possible morphologies include fibrous structures, platelets, amorphous ribbons
, and even dual-phase interpenetrating blends, created by drawing one layer of material through holes in another layer and tacking the two together.