Bulk Glassy Fe–Mo–Ga–P–C–B–Si Alloys with High Glass-Forming Ability and Good Soft Magnetic Properties
Masahiro AkibaBaolong ShenAkihisa Inoue
Abstract
The effect of Mo and Si additions on the glass-forming ability (GFA) of Fe77−xMoxGa3P10C4B4Si2 alloys was investigated. The addition of 2 at%Mo combined with 2 at%Si was found to be effective for the extension of the supercooled liquid region (ΔTx) defined by the difference between glass transition temperature (Tg) and crystallization temperature (Tx). The ΔTx value is 33 K for the Fe77Ga3P12C4B4 alloy, and increases to 60 K for the Fe75Mo2Ga3P10C4B4Si2 glassy alloy. In addition, this glassy alloy exhibits a high reduced glass transition temperature (Tg⁄Tl) of 0.6. The large ΔTx and high Tg⁄Tl enabled us to prepare the Fe75Mo2Ga3P10C4B4Si2 bulk glassy alloy successfully with a diameter of 2 mm and high saturation magnetization (Is) of 1.27 T. The Fe75Mo2Ga3P10C4B4Si2 glassy alloy also exhibits good soft magnetic properties, i.e., high effective permeability at 1 kHz of 1.1×104 and low coercive force of 5 A/m.
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