High Strength and Good Soft Magnetic Properties of Bulk Glassy Fe–Mo–Ga–P–C–B Alloys with High Glass-Forming Ability

Abstract

The effect of the addition of the transitional metal Mo, on the glass-forming ability, mechanical strength and magnetic properties of Fe_78−xMo_xGa₂P₁₂C₄B₄ glassy alloys was investigated. The addition of 4 to 6 at%Mo was found to be effective for the extension of the supercooled liquid region (ΔT_x) defined by the difference between the glass transition temperature (T_g) and crystallization temperature (T_x). The ΔT_x value is 30 K for the Fe₇₈Ga₂P₁₂C₄B₄ alloy and increases to 60 K for the 4 at%Mo alloy. These glassy ribbon alloys exhibit good soft magnetic properties of 1.13 to 1.34 T for saturation magnetization and 2.2 to 3.8 A/m for coercive force. Based on the large ΔT_x values, we tried to prepare bulk glassy Fe₇₄Mo₄Ga₂P₁₂C₄B₄ rods in a cylindrical form with different diameters. The glassy single phase was obtained in the diameter range of 1.0 to 2.0 mm. These bulk glassy alloys also exhibit high saturation magnetizations of about 1.20 T as well as a high compressive strength of 2685 MPa.