The bulk amorphous alloys based on iron or cobalt display good soft magnetic properties (low value of coercivity and high saturation of the magnetization). These features lead to wide range of application of these materials. In this work the microstructure, thermal stability and magnetic properties of Fe₆₁Co₁₀Zr_2,5Hf_2,5Me_4-xW₂B₂₀ (where Me = Nb, Mo, Ti, Y, Ni) bulk amorphous alloys were investigated.
Samples were obtained using induction suction method as a 0,5 mm thickness and 1 cm² area plates. The study of the microstructure were performed using X-ray diffraction and mössbauer spectroscopy. It was shown that the Fe₆₁Co₁₀Zr_2,5Hf_2,5Me_4-xW₂B₂₀ (Me = Nb, Mo, Ti, Y, Ni) alloys have amorphous structure in all volume of the samples. The magnetic properties were investigated using LakeShore VSM magnetometer. From analysis of hysteresis loops magnetic parameters were derived.  It was found that coercivity field is less then few teens A/m and saturation of the magnetization is about 106 A/m for all measured samples. Thermal stability of the investigated alloys were obtained using differential scanning calorymetry (DSC). From DSC plots several characteristic temperatures like T_g the glass transition temperature, T_x the crystallization temperature, ΔT_x=T_x-T_g extent of the supercooled liquid region, T₁ the primary crystallization temperature, T₂ the secondary crystallization temperature, ΔT_l=T₁-T_x undercooled temperature, T_m the melting temperature, T_l the liquidus temperature, T_rg=T_g/T_l reduced glass transition temperature, ΔT_m=T_l–T_m interval temperature, modified GFA parameter defined as γm = (2T_xT_g)/T_l were derived. For all measured samples reduced glass transition temperature parametr T_rg have values higher then 0,6 and GFA parameter γ_m higher then 0,7 what prove good glass formability of investigated alloys. 

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