Soft magnetic properties of ring shape bulk glassy Fe-Al-Ga-P-C-B-Si alloy prepared by copper mold casting

Abstract

Structural and soft magnetic properties were investigated for a bulk glassy Fe70Al5Ga2P9.65C5.75B4.6Si3 alloy in a ring shape form with an outer diameter of 10 mm, an inner diameter of 6 mm and a thickness of 1 mm prepared by copper mold casting. The bulk sample composes of an amorphous single phase. The supercooled liquid region (ΔTx) defined by the difference between the crystallization temperature (Tx) and glass transition temperature (Tg) for the bulk glassy alloy is about 60 K, being in agreement with that of the corresponding amorphous alloy ribbon. Saturation magnetization (σs) and Curie temperature (Tc) for the bulk sample are about 1.2 T and 620 K, respectively, both of which agree with those of the melt-spun ribbon. Furthermore, the maximum permeability (μmax) and the coercivity (Hc) for the bulk glassy sample in as cast state are about 110000 and 2.2 A/m, respectively. These excellent soft magnetic properties are presumably due to a higher degree of structural homogeneity resulting from its high glass-forming ability. It is concluded that the good soft magnetic properties combined with high glass-forming-ability and castability of the Fe-Al-Ga-P-C-B-Si glassy alloy hold promise for its development as a future engineering magnetic material.