Effect of microalloying on crystallization behavior, magnetic properties and bending ductility of high Fe content FeSiBCuPC alloys

Abstract

Effect of microalloying on microstructure, magnetic properties and bending ductility of the Fe85.7-85.8Si0.5B9-9.3P3.5-4Cu0.5-0.8C0.2-0.3 alloy ribbons with high Fe content was systematically investigated. It is found that the substitution of 0.1 at. % Cu or 0.2 at. % Cu for (B+P) content inhibits the crystallization and improves the amorphous forming ability of melt-spun Fe85.7-85.8Si0.5B9-9.3P3.5-3.9Cu0.6-0.7C0.2-0.3 alloys. The first crystallization temperature (Tx1) increases slightly with the addition of C or P content, while the second crystallization temperature (Tx2) exhibits a slightly decrease. All amorphous alloys exhibit a large temperature interval between Tx1 and Tx2, which contributes to the thermal stability and leads to the formation of a single α-Fe phase. In the as-spun state, the amorphous alloys have good bending ductility even at high Fe content. After the optimum heat treatments, the Fe85.7-85.8Si0.5B9-9.3P3.5-3.9Cu0.6-0.7C0.2-0.3 nanocrystalline alloys exhibits the excellent soft magnetic properties, such as the highest Ms of 206.4–210.2 emu/g (Bs ≈ 1.95–1.98 T) and the lowest Hc of 6.5–8.4 A/m.