C effect on the amorphous formation and soft magnetic properties of Fe84.3Si4B8P3-C Cu0.7 nanocrystalline alloys

In order to improve the amorphous forming ability (AFA) of the Fe 84.3 Si 4 B 8 P 3 Cu 0.7 alloy with high Fe content without reducing its excellent soft magnetic properties, the effect of C addition on the AFA, thermal stability, nanocrystallization behavior and soft magnetic properties of the Fe 84.3 Si 4 B 8 P 3- x C x Cu 0.7 ( x = 0, 1, 2, 3) alloys were investigated. The results indicate that the both the AFA and the temperature intervals between the first and the second crystallization temperatures are obviously improved. The rapid annealing treatment at T x1 for 150s is suitable for obtaining the nanocrystalline phase with small size in these alloys. For the as-annealed Fe 84.3 Si 4 B 8 P 3- x C x Cu 0.7 ( x = 0, 1, 2, 3) ribbons, the saturation flux density ( B s ) increases from 1.82 to 1.88 T with increasing x from 0 to 3, while coercivity ( H c ) does not have such change tendency. The Fe 84.3 Si 4 B 8 P 1 C 2 Cu 0.7 nanocrystalline ribbon exhibits a higher B s of 1.84 T and the lowest H c of 3.7 A/m, and its excellent soft magnetic properties and low material cost make it have great application potential.