Jia X, Li Y, Wu L, et al. AIP Advances, 2018, 8(5): 056110.

Abstract:

Addition of minor Mn effectively improves the amorphous-forming ability and thermal stability of the Fe₈₅Si₂B₈P₄Cu₁ alloy. With increasing the Mn content from 0 to 3 at.%, the critical thickness for amorphous formation and onset temperature of the primary crystallization increase from 14 μm and 659 K to 27 μm and 668 K, respectively. The fine nanocrystalline structure with α-Fe grains in size (D) of < 20 nm was obtained for the annealed amorphous alloys, which show excellent soft magnetic properties. The alloying of Mn reduces the coercivity (H_c) by decreasing the D value and widens the optimum annealing temperature range for obtaining low H_c, although the saturation magnetic flux density (B_s) is decreased slightly. The Fe₈₃Mn₂Si₂B₈P₄Cu₁ nanocrystalline alloy possesses fine structure with a D of～17.5 nm, and exhibits a high B_s of～1.75 T and a low H_c of～5.9 A/m. The mechanism related to the alloying effects on the structure and magnetic properties was discussed in term of the crystallization activation energy.

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