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Thermal Stability and Crystallization οf Iron and Cobalt - Based Bulk Amorphous Alloys

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Olszewski J., Zbroszczyk J., Sobczyk K., Ciurzyńska W., Brągiel P., Nabiałek M., Świerczek J., Hasiak M., Łukiewska A.

Acta Physica Polonica A

2008

vol. 114

issue 6

1659-1666

Microstructure by the Mössbauer spectroscopy and approach to magnetic saturation in the bulk amorphous Fe_{61}Co_{10}Me_7Y_2B_{20} (Me_7=Y_7, Y_6Ti_1 or Zr_{2.5}Hf_{2.5}W_2) alloys are investigated. The bulk amorphous Fe_{61}Co_{10}Zr_{2.5}Hf_{2.5}W_2Y_2B_{20} 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 Fe_{61}Co_{10}Y_8Ti_1B_{20} and Fe_{61}Co_{10}Y_9B_{20} alloys after annealing at 750 K and 840 K, respectively.

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1 Acta Physica Polonica A

1 2008

1 Brągiel P.

1 Ciurzyńska W.

1 Hasiak M.

1 Nabiałek M.

1 Olszewski J.

1 Sobczyk K.

1 Zbroszczyk J.

1 Łukiewska A.

1 Świerczek J.

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Thermal Stability and Crystallization οf Iron and Cobalt - Based Bulk Amorphous Alloys