Effect of Cr addition on the glass-forming ability, magnetic properties, and corrosion resistance in FeMoGaPCBSi bulk glassy alloys

The effect of Cr addition on the glass-forming ability (GFA), the magnetic properties, and corrosion resistance in Fe–Mo–Ga–P–C–B–Si glassy alloys was investigated. In addition to a slight increase of supercooled liquid region from $50\text{to}55\mathrm{K}$ , the substitution of a small amount of Fe with Cr was found to be effective for approaching alloy to a eutectic point, resulting in an increase in GFA. By copper mold casting, bulk glassy alloy rods with diameters up to $3\mathrm{mm}$ were produced. These glassy alloys exhibit a rather high saturation magnetization of $0.84–1.11\mathrm{T}$ with good soft-magnetic properties, i.e., low coercive force of $2.3–2.9\mathrm{A}∕\mathrm{m}$ , and high effective permeability of 13 360–15 960 at $1\mathrm{kHz}$ under a field of $1\mathrm{A}∕\mathrm{m}$ . The passive current density of the glassy alloy rod in $3\text{mass}\%$ NaCl solution decreased significantly from $1\times {10}^2\text{to}3\times {10}^{-1}\mathrm{A}∕{\mathrm{m}}^2$ with an increase in Cr content, indicating that the addition of Cr is effective in enhancing the corrosion resistance.