Bulk glassy Fe-Ga-P-C-B-Si alloys with high glass-forming ability, high saturation magnetization and good soft magnetic properties

摘要

The effect of Si addition on the glass-forming ability and magnetic properties for the Fe{sub}77Ga{sub}3P{sub}(12-x)C{sub}4B{sub}4Si{sub}x glassy alloys was investigated. For the both alloys, the addition of 2.5at%Si was found to be effective for the extension of the supercooled liquid region(ΔT{sub}x) defined by the difference between the glass transition (T{sub}g)and crystallization temperature(T{sub}x). The ΔT{sub}x value is 28 K for Fe{sub}77Ga{sub}3P{sub}12C{sub}4B{sub}4 alloy and increases to 48K for the Fe{sub}77Ga{sub}3P{sub}9.5C{sub}4Si{sub}2.5 alloy. The effectiveness of Si addition can be interpreted in the framework of the three component rules for the formation of bulk glassy alloys and the stabilization of supercooled liquid. The three component rules are satisfied at a high degree of level by the addition of Si. The glassy single phase was obtained in the diameter range up to 2.5mm for the Fe{sub}77Ga{sub}3P{sub}9.5C{sub}4B{sub}4Si{sub}2.5 glassy alloy and 2.0 mm for the Fe{sub}78Ga{sub}2P{sub}9.5C{sub}4B{sub}4Si{sub}2.5 glassy alloy. The glassy alloys exhibited high saturation magnetization(I{sub}s) and good soft magnetic properties, i.e., high I{sub}s of 1.36 and 1.40T, and low coercive force(H{sub}c) of 4.25 and 3.35 A/m, respectively. The high I{sub}s and low H{sub}c as well as high glass-forming ability of the Fe-based bulk glassy alloys are promising as a new type of soft magnetic bulk alloy.