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 to 55 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 mm were produced. These glassy alloys exhibit a rather high saturation magnetization of 0.84–1.11 T with good soft-magnetic properties, i.e., low coercive force of 2.3–2.9 A/m, and high effective permeability of 13 360–15 960 at 1 kHz under a field of 1 A/m. The passive current density of the glassy alloy rod in 3 mass % NaCl solution decreased significantly from 1×10² to 3×10^-1 A/m² with an increase in Cr content, indicating that the addition of Cr is effective in enhancing the corrosion resistance.