Bulk Glassy Fe–Co–Ga–P–C–B Alloys with High Glass-Forming Ability, High Saturation Magnetization and Good Soft Magnetic Properties

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Abstract
The effect of ferromagnetic metal Co on the glass-forming ability and magnetic properties for the Fe75−xCoxGa5P12C4B4 glassy alloys was investigated. The additions of 10 to 15 at%Co were found to be effective for the extension of the supercooled liquid region (ΔTx) defined by the difference between the glass transition temperature (Tg) and crystallization temperature (Tx). The ΔTx value is 37 K for the Fe75Ga5P12C4B4 alloy and increases to 48 K for the 10, 12.5 and 15 at%Co alloys. The liquidus temperature (Tl) of the 10, 12.5 and 15 at%Co alloys decreased by the addition of Co and the reduced glass transition temperature (Tg⁄Tl) increased. The largest Tg⁄Tl is 0.61 for the Fe65Co10Ga5P12C4B4 alloy. These glassy ribbon alloys exhibit good soft magnetic properties of 1.15 to 1.33 T for saturation magnetization and 2.4 to 3.6 A/m for coercive force. Based on the large ΔTx and high Tg⁄Tl values, we tried to prepare bulk glassy Fe75−xCoxGa5P12C4B4 (x=10, 12.5, 15) rods in a cylindrical form with different diameters. The glassy single phase was obtained in the diameter of 1.5 mm in the composition range of 10 to 15 at%Co.