NANOCRYSTALLIZATION STUDIES OF RAPIDLY QUENCHED Fe85.4-xCoxZr6.8-yNbyB6.8Cu1 (x = 0 OR 42.7, y = 0 OR 1) ALLOYS

Jacek Olszewski1, Józef Zbroszczyk1, Wanda Ciurzyńska1, Hirotoshi Fukunaga2, Bolesław Wysłocki1, Kamila Perduta1, Agnieszka Łukiewska1, Alina Młyńczyk1, Józef Lelątko3, Jan Świerczek1

1Institute of Physics, Technical University of Częstochowa, 19 Armii Krajowej Str., 42-200 Częstochowa, Poland,
2Electrical Engineering Department, University of Nagasaki, Nagasaki, Japan,
3Institute of Physics, University of Silesia, 12 Bankowa Str., 40-007 Katowice, Poland

The microstructure of amorphous and nanocrystalline Fe42.7Co42.7Zr6.8-xNbxB6.8Cu1 (x = 0 or 1) alloys was investigated. We have stated that the nanocrystalline samples consist of the crystalline a-FeCo grains about 8 nm in diameter embedded in an amorphous matrix which is rich in cobalt. From Mössbauer spectroscopy studies we have found that the crystalline a-FeCo phase in the nanocrystalline samples obtained by the conventional annealing is atomically ordered. Moreover, the order degree depends on the annealing time. As for the samples partially crystallized during rapid quenching, the crystalline a-FeCo phase is atomically disordered.