Tailoring soft magnetic properties of Fe-based amorphous alloys through C addition

It is known that developing Fe-based amorphous alloys with the saturation flux density(B) higher than 1.65 T is a major challenge.In present work,effects of C addition on magnetic properties of Fe-based amorphous alloys were systematically studied.It has been found that the addition of C can significantly increase the saturation flux density(B) and the magnetic flux density at 800 A/m(B) of the Fe-B-C-Si-P amorphous alloys.After the addition of C,the Bof the amorphous alloys increase from 1.61 T(FeBSiP) to 1.65-1.71 T(FeBCSiP,x=1.5,2,3 and 4). The FeBCSiPamorphous alloy possesses excellent soft magnetic properties with high Bof 1.71 T and low Hof 1.5 A/m.It shows that density increase of the alloys and weakened metalloid-sp/metal-d bonding caused by C addition contribute to the increment of B.It suggests that the newly developed high-performance amorphous alloys possess great potential in application.