Abstract
In this work, we have investigated the effect of Molybdenum (Mo) content on the microstructure and magnetic properties of FeSUB77.5/SUBSiSUB11.5/SUBBSUB7/SUBMoSUBx/SUBNbSUB3-x/SUBCu₁ (x = 0~3 at.%) nanocrystalline soft magnetic alloys. Previous studies have reported that transition metal elements have a great effect on improving the glass forming ability (GFA) of amorphous alloys. In particular, Mo is expected to be most effective in improving GFA of amorphous alloys among various transition metal elements because it has a large atomic radius and a negative mixing enthalpy with metalloid elements. In this study, nanocrystalline ribbons with a composition of FeSUB77.5/SUBSiSUB11.5/SUBBSUB7/SUBNbSUB3-x/SUBMoSUBx/SUBCu₁ (x = 0~3) have been fabricated by rapid-quenching melt spinning and thermal annealing. It has been demonstrated that the addition of a small amount of Mo (1~3 at.%) to the alloy improves the GFA and significantly suppresses undesirable surface and internal crystallization during the melt spinning process. Among the alloys investigated in this work, FeSUB77.5/SUBSiSUB11.5/SUBBSUB7/SUBNbSUB0/SUBMo₃Cu₁ nanocrystalline ribbon annealed at 580 ℃ have exhibited excellent soft-magnetic properties including lowest coercivity of 5 A/m, highest maximum relative permeability of 14340, and highest flux density.
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