Abstract
Fe-rich amorphous alloys with FeCo contents above 85 at% were formed by partial replacement of Fe by Co in Fe-Si-B-P alloy system. The resulting alloys exhibit good soft magnetic properties and bending ductility after stress relief annealing. Moreover, the maximum magnetic flux density (B-s) approaches 1.75 T, which is higher than those for previous reported Fe-rich Fe-metalloid alloys. Thus, the partial substitution of Fe by Co caused both Curie temperature (T-C) and Bs exceeding those for the Fe-Si-B-P alloys. Any compositional modification so as to raise T-C was found to be effective for the further increase in the previous maximum value of B-s for the Fe-metalloid amorphous alloy system reported to date. Based on this concept, it is expected that further high B-s exceeding largely 1.75 T is obtained for Fe-based soft magnetic alloys with higher total ferromagnetic element content. (C) 2016 Elsevier B.V. All rights reserved.