The structure evolution and low-field magnetic properties (i.e. the magnetic susceptibility and its disaccommodation) during transformation of the Fe sub 85.4 Zr sub 6.8-x Nb sub x B sub 6.8 Cu sub 1 ...(x = 0, 1) alloys from the amorphous to the nanocrystalline state are investigated. It was stated that at early stages of crystallization, the iron content in the amorphous matrix does not change. However, the interfacial layer is poorer in iron in comparison with the amorphous matrix. The annealing of the amorphous samples below the crystallization temperature leads to the decrease of the hyperfine field due to the invar effect. Moreover, at early stages of crystallization, the samples exhibit 'magnetic hardening'. The magnetic susceptibility disaccommodation of the investigated alloys is mainly connected with relaxation processes occurring in the amorphous phase.
The structure evolution and low-field magnetic properties (i.e. the magnetic susceptibility and its disaccommodation) during transformation of the Fe
85.4Zr
6.8−
x
Nb
x
B
6.8Cu
1 (
x=0,1) alloys from ...the amorphous to the nanocrystalline state are investigated. It was stated that at early stages of crystallization, the iron content in the amorphous matrix does not change. However, the interfacial layer is poorer in iron in comparison with the amorphous matrix. The annealing of the amorphous samples below the crystallization temperature leads to the decrease of the hyperfine field due to the invar effect. Moreover, at early stages of crystallization, the samples exhibit “magnetic hardening”. The magnetic susceptibility disaccommodation of the investigated alloys is mainly connected with relaxation processes occurring in the amorphous phase.
Summary form only given. The nanocrystallization process of the amorphous Fe/sub 85.4/Zr/sub 6.8-x/Nb/sub x/B/sub 6.8/Cu/sub 1/ (x=0, 1) alloys was studied by the differential scanning calorimetry, ...Mossbauer spectroscopy and transmission electron microscopy. Moreover, the authors have measured the magnetic properties, i.e. magnetic susceptibility, its disaccommodation and core losses, of samples annealed in the temperature range from 688 K to 800 K. From DSC studies, using the Kissinger method, they have found that the replacement of 1% of Zr atoms by Nb atoms in the Fe/sub 85.4/Zr/sub 6.8/B/sub 6.8/Cu/sub 1/ alloy leads to the decrease of the primary crystallization activation energy from 118 kJ/mol to 94 kJ/mol. The crystalline grains of the /spl alpha/-Fe phase in the nanocrystalline Fe/sub 85.4/Zr/sub 5.8/Nb/sub 1/B/sub 6.8/Cu/sub 1/ alloy are more refined.
