Thermal Stability and Crystallization of Iron and Cobalt - Based Bulk Amorphous Alloys |
| J. Olszewski a, J. Zbroszczyk a, K. Sobczyk a, W. Ciurzyńska a, P. Brągiel b, M. Nabiałek a,, J. Świerczek a, M. Hasiak c and A. Łukiewska a a Institute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland b Institute of Physics, Jan Długosz University, al. Armii Krajowej 15, 42-200 Częstochowa, Poland c Institute of Materials Science and Applied Mechanics, Wrocław University of Technology, Smoluchowskiego 25, 50-370 Wrocław, Poland |
| Full Text PDF |
| Received: 08 06 2008 |
| Microstructure by the Mössbauer spectroscopy and approach to magnetic saturation in the bulk amorphous Fe61Co10Me7Y2B20 (Me7=Y7, Y6Ti1 or Zr2.5Hf2.5W2) alloys are investigated. The bulk amorphous Fe61Co10Zr2.5Hf2.5W2Y2B20 alloy exhibits the best thermal stability and remains amorphous up to 901 K. Moreover, the quasi-dislocations dipoles present in this amorphous alloy have the largest width equal to 6.7 nm. After annealing this alloy below the crystallization temperature the enhancement of both the average hyperfine field and its standard deviation is observed which points to the increase in the atom packing density due to the decay of quasi-dislocation dipoles. After the annealing at 901 K the small amount of the crystalline α-FeCo phase is presented in this alloy. The same crystalline phase appears in the bulk Fe61Co10Y8Ti1B20 and Fe61Co10Y9B20 alloys after annealing at 750 K and 840 K, respectively. |
| DOI: 10.12693/APhysPolA.114.1659 PACS numbers: 75.50.Kj, 75.50.Bb, 76.80.+y |