NUKLEONIKA 2007, 52(Supplement 1):S29-S32

ORDERING OF a-FeCo PHASE IN THE NANOCRYSTALLINE Fe83-xCoxNb3B13Cu1 (x = 6, 25 OR 41.5) ALLOYS

Józef Zbroszczyk1, Alina Młyńczyk1, Jacek Olszewski1, Wanda Ciurzyńska1, Bolesław Wysłocki1, Kamila Perduta1, Józef Lelątko2, Marcin Nabiałek1

1 Institute of Physics, Częstochowa University of Technology, 19 Armii Krajowej Str., 42-200 Częstochowa, Poland
2 Institute of Materials Science, University of Silesia, 12 Bankowa Str., 40-007 Katowice, Poland

The microstructure and ordering of a-FeCo phase of the nanocrystalline Fe83-xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloys were investigated. We have stated that a-FeCo phase is atomically ordered in the Fe83-xCoxNb3B13Cu1 (x = 25 or 41.5) samples crystallized by the heat treatment in a furnace. However, after flash annealing (by current or laser) that phase is disordered. Moreover, we have found that Co concentration in the crystalline a-FeCo phase strongly depends on Co content in the as-quenched ribbons. The annealing conditions influence also the grain diameter of the crystalline phase. In the nanocrystalline alloys obtained by a flash annealing of the amorphous ribbons finer grains are present.