Recently, (Fe-Co)-B-Si-Nb bulk metallic glasses (BMGs) were produced. Such BMGs exhibit high glass-forming ability (GFA) as well as good mechanical and magnetic properties (s_f: ~4000 MPa; M_s: ~1 T; µ: ~12000; H_c: ~2 A/m). These alloys are regarded as one of the most attractive candidates for application, because they combine the advantages of functional and structural materials. Their good soft magnetic properties can be even enhanced by small addition of Cu. Studies of crystallization and its effect on the magnetic properties in this system are essential for possible commercial application, similar like in the case of FINEMET-type alloys. However, few works have been devoted to this topic so far. In this paper, {[(Fe_0.5Co_0.5)_0.75Si_0.05B_0.20]_0.96Nb_0.04}_100-xCu_x glassy alloys (x = 1, 2 and 3) were chosen for investigation. The GFA and the thermal stability of these alloys were evaluated. The effects of crystallization during heat-treatement processes on the phase evolution, the kinetic parameters and the magnetic properties, including M_s, H_c and T_c, in these alloys were investigated. The phase analyses were done with the help of the X-ray diffraction patterns recorded in-situ by using the synchrotron radiation in transmission configuration.

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