Development of Fe-based amorphous alloys with high B<inf>s</inf> and amorphous-forming ability

Abstract

Soft-magnetic amorphous alloys based on the ferromagnetic elements Fe, Co, Ni and their combination have attracted increasing interests since the discovery of the Fe-P-C system in 1967, because of their excellent soft-magnetic performances including high saturation flux density (B s ), low coercivity (H c ), high permeability, low core loss, and so on. By devoting subsequent great efforts, a variety of ferromagnetic amorphous alloys have been developed and many have been widely used such as various Fe-based, Co-based and FeNi-based amorphous alloys under the trademarks of METGLAS and VITROVAC with different performance[1]. Nevertheless, owing to the restriction of amorphous forming ability (GFA), it is hard to further increase the B s by increasing the Fe content[2]. Development of ferromagnetic amorphous alloys with high B s and amorphous-forming ability are tremendous desired.