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 50to55K, 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 3mm were produced. These glassy alloys exhibit a rather high saturation magnetization of 0.84–1.11T with good soft-magnetic properties, i.e., low coercive force of 2.3–2.9A∕m, and high effective permeability of 13 360–15 960 at 1kHz under a field of 1A∕m. The passive current density of the glassy alloy rod in 3mass% NaCl solution decreased significantly from 1×102to3×10−1A∕m2 with an increase in Cr content, indicating that the addition of Cr is effective in enhancing the corrosion resistance.