Suction-cast rod samples of the diameters 1 and 2 mm and thin walled tubes of the outer diametes 2, 3 and 4 mm as well as the melt-spun ribbon samples of various thicknesses up to 350 μm of Fe₆₁Co_10+xZr₅W_4-xB₂₀ (x=0, 2, 3) alloys, were investigated. X-ray diffraction and DSC analysis revealed fully amorphous structure of ribbon samples up to the thickness of 220 μm. Those results indicate good glass forming abilities of the alloys. The suction-casting process allows to produce the bulk amorphous samples by die-casting to the copper mould. X-ray diffractometry and Mössbauer spectroscopy revealed, that for the Fe₆₁Co₁₀Zr₅W₄B₂₀ alloy, the rod samples up to diameter of 2 mm and thin walled tubes up to 4 mm of outer diameter were also fully amorphous. Measurement of the magnetic properties for the rod and ribbon samples demonstrated relatively high saturation polarization J_s = 0.8 T and low coercivity _JH_c ~ 4 A/m. In the present paper, studies of W content influence on the magnetic properties and glass forming abilities are discussed. Decrease of the W contents results in the increase of the saturation polarization of the ultimate alloy due to the increase of the Co contents. However, drastic reduction of the glass forming abilities is also the consequence of these composition changes.

Work supported by Polish Scientific Research Committee (KBN) (projects no. 3T08A 046 27 and 3T08A028 25)

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