Effects of yttrium on the glass-forming ability and corrosion resistance of Fe_50-xMo₁₄Cr₁₅C₁₅ B₆Y_x amorphous alloys

Fe_50-xMo₁₄Cr₁₅C₁₅ B₆Y_x (x = 0, 2) amorphous alloy ribbons were prepared by single roller method. The structures, glass-forming ability (GFA), thermal stability, crystallization process and corrosion behavior of the amorphous alloys were investigated by means of X-ray diffraction, differential scanning calorimetry, transition electron microscopy and potentiodynamic polarization experiments. The results showed that the Fe_50-xMo₁₄Cr₁₅C₁₅ B₆Y_x (x = 0, 2) alloys can be prepared into amorphous alloy ribbons. The amorphous content, GFA and thermal stability of the amorphous alloys are extremely enhanced with yttrium addition. The predominant crystalline phases precipitated after the crystallization process are α-Fe, Fe₂₃B₆, Cr₂₃C₆ and Fe₃Mo₃C. The amorphous alloys exhibit higher corrosion resistance in 3.5%NaCl aqueous solution compared with stainless steel Cr₁₈Ni₉Ti, and show wider passive region and lower passive current density with yttrium addition.