Properties of Fe-B-Ga and Fe-B-Si-C-Al amorphous alloys

The crystallization temperature, Curie temperature, saturation magnetization, and coercivity of amorphous alloys in the ternary Fe-B-Ga system are reported. The range of compositions containing Ga for which these alloys can be made amorphous by casting onto a rapidly rotating drum is much more restricted than for Fe-B-C, Fe-B-Si, or Fe-B-Ge alloys; only up to 5 a/o Ga could be substituted for B. On replacing B by Ga the crystallization temperature typically decreases, the Curie temperature increases, the saturation magnetization at low temperatures and at room temperature decreases, and the coercivity increases. Some alloys in the series Fe84-(B, Al)16, Fe84Si2-(B, Al)14, Fe80Si4-(B, Al)16, and Fe82B9C3-(Si, Al)6were also prepared. Aluminum contents of only up to 3 a/o could be used to make amorphous ribbons. In all of these alloys, with increasing Al, the crystallization temperature decreased, the Curie temperature decreased, and the room temperature saturation magnetization decreased.