Maintaining high saturation magnetic flux density and reducing coercivity of Fe-based amorphous alloys by addition of Sn

摘要

The effect of minor Sn on crystallization behavior, soft magnetic properties and corrosion resistance of Fe83B10-xC3Si3P1Snx (x = 0.25, 0.5 and 0.75) amorphous alloys was investigated. Sn added alloys exhibit excellent saturation magnetic flux density (B-s) of L63-1.72 T, low coercivity of 2.5-5.4 A/m and higher corrosion resistance. Furthermore, coercivity of as-spun alloys is lowered by Sn addition, and mechanisms behind the change of soft magnetic properties were discussed. The finding suggests that soft metal Sn may act as a stress reliever in as-spun alloys, leading to low coercivity while maintaining ductility. This theory was then confirmed in high Co content amorphous alloys with B-s of 1.75 T, in which case Sn addition causes significant reduction of coercivity but no decline of B-s. The present strategy of Sn addition may pave a new and universal way for Fe-based amorphous alloys to simultaneously obtain high B-s, lower H-c and high ductility.