Abstract:The effect of casting vacuum on thermodynamic and corrosion properties of Fe₆₁Co₇Zr₈Mo₅W₂B₁₇ in shape of cylinder of 3 mm in diameter and ribbon of 20-40 μm in thickness and 2-3 mm in width were investigated with X-ray diffraction (XRD), differential scanning calorimetry (DSC), dilatometer (DIL), scanning electron microscopy (SEM) and electrochemical station. It is found that high casting vacuum can improve the glass forming ability (GFA), the contraction degree during heating, and the pitting resistance of the glassy alloy, which can be ascribed to the fact that the dissolution of tungsten in the melt is improved under the high casting vacuum.

Key words: Fe-based alloys; casting vacuum; dilation; corrosion resistance