FeMoGaPCBSi バルクガラス合金の作製と軟磁気特性

抄録

  The addition of 2 at%Mo combined with 2 at%Si was found to be effective for the extension of the supercooled liquid region (ΔT_x) and approaching alloy to a eutectic point in the Fe_77-xMo_xGa₃P₁₀C₄B₄Si₂ alloy system. The ΔT_x value is 33 K for the Fe₇₇Ga₃P₁₂C₄B₄ glassy alloy, and increases to 60 K for the Fe₇₅Mo₂Ga₃P₁₀C₄B₄Si₂ glassy alloy. Besides, this glassy alloy exhibits a high reduced glass transition temperature (T_g/T_l) of 0.6. The large ΔT_x and high T_g/T_l enabled us to prepare the Fe₇₅Mo₂Ga₃P₁₀C₄B₄Si₂ bulk glassy alloy successfully with a diameter of 2 mm and high saturation magnetization (I_s) 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.