Soft magnetic properties of Fe based amorphous thick sheets with large glass forming ability

Abstract

The thermal stability of the supercooled liquid, glass forming ability (GFA) and magnetic properties were examined for amorphous ${\mathrm{Fe}}_{\text{72−x}}{\mathrm{Al}}_{\mathrm{5}}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{P}}_{\mathrm{11}}{\mathrm{C}}_{\mathrm{6}}{\mathrm{B}}_{\mathrm{4}}{\mathrm{Si}}_x,$ ${\mathrm{Fe}}_{\mathrm{72}}{\mathrm{Al}}_{\mathrm{5}}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{P}}_{\text{11−x}}{\mathrm{C}}_{\mathrm{6}}{\mathrm{B}}_{\mathrm{4}}{\mathrm{Si}}_x,$ and ${\mathrm{Fe}}_{\mathrm{72}}{\mathrm{Al}}_{\mathrm{5}}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{P}}_{\mathrm{11}}{\mathrm{C}}_{\text{6−x}}{\mathrm{B}}_{\mathrm{4}}{\mathrm{Si}}_x$ alloys. The increases in the thermal stability and GFA and the improvement of the soft magnetic properties were recognized in the replacements of $P$ by 1 to 2 at. % Si and of C by 1 at. % Si. The supercooled liquid region ${\mathrm{\Delta T}}_x$ defined by the difference between $T_x$ and $T_g$ increases from 53 K for ${\mathrm{Fe}}_{\mathrm{72}}{\mathrm{Al}}_{\mathrm{5}}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{P}}_{\mathrm{11}}{\mathrm{C}}_{\mathrm{6}}{\mathrm{B}}_{\mathrm{4}}$ to 58 K for ${\mathrm{Fe}}_{\mathrm{72}}{\mathrm{Al}}_{\mathrm{5}}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{P}}_{\mathrm{11}}{\mathrm{C}}_{\mathrm{5}}{\mathrm{B}}_{\mathrm{4}}{\mathrm{Si}}_{\mathrm{1}}$ . The maximum thickness for glass formation ${\mathrm{(t}}_{\max })$ by copper mold casting also increases from 1 mm for the Fe–Al–Ga–P–C–B alloy to 3 mm for the ${\mathrm{Fe}}_{\mathrm{72}}{\mathrm{Al}}_{\mathrm{5}}{\mathrm{Ga}}_{\mathrm{2}}{\mathrm{P}}_{\mathrm{10}}{\mathrm{C}}_{\mathrm{6}}{\mathrm{B}}_{\mathrm{4}}{\mathrm{Si}}_{\mathrm{1}}$ alloy. The increases in ${\mathrm{\Delta T}}_x$ and $t_{\max }$ are presumably because of the increase in the degree of the satisfaction of the three empirical rules for glass formation. The soft magnetic properties are also improved by the replacement of 1% Si through the increase in the squareness ratio of $\mathrm{B–H}$ loop ${\mathrm{(B}}_r{\mathrm{/B}}_s)$ and the decrease in coercive force ${\mathrm{(H}}_c)$ . The best soft magnetic properties for the bulk amorphous alloys are 1.14 T for

Keywords

• COERCIVE FORCE
• IRON ALLOYS
• FERROMAGNETIC MATERIALS
• METALLIC GLASSES
• GLASS TRANSITION
• SOFT MAGNETIC MATERIALS
• AMORPHOUS MAGNETIC MATERIALS
• THERMAL STABILITY
• SUPERCOOLING
• ALUMINIUM ALLOYS
• BORON ALLOYS
• GALLIUM ALLOYS
• PHOSPHORUS ALLOYS
• SILICON ALLOYS
• MAGNETIC HYSTERESIS

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