Bulk glassy Fe-Ga-P-C-B alloys with high saturation magnetization and good soft magnetic properties synthesized by fluxing treatment and copper mold casting

The effect of fluxing treatment on the glass-forming ability for the Fe75Ga5P12C4B4 glassy alloy was investigated. The fluxing treatment was found to be effective for the elimination of heterogeneous nucleation sites. The glass transition temperature (T-g), crystallization temperature (T-x), supercooled liquid region (DeltaT(x)) and reduced glass transition temperature (T-g/T-m) are all increased by fluxing treatment. The T-g, T-x, DeltaT(x) and T-g/T-m values for Fe75Ga5P12C4B4 glassy alloy are 731 K, 768 K, 37 K and 0.610 respectively before fluxing treatment, increase to 749 K, 805 K, 56 K and 0.625 respectively after fluxing treatment. Bulk glassy Fe75Ga5P12C4B4 alloy rods with high saturated magnetization (I-s) of 1.27 T and good soft magnetic properties of 1.6 A/m for coercive force (H-c) were prepared with diameters range up to 2.5 mm by the copper mold casting method of fluxed alloy melt The glass synthesis consists of preparing the alloy ingot by induction melting, thermal cycling and purifying the melt in B2O3 flux inside a silica tube and then casting the purified alloy into a copper mold. The size of 2.5 mm in diameter of the rod is not an upper limit.