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The Influence of Annealing on the Structural and Soft Magnetic Properties of (Fe0.4Co0.6)79Nb3B18 Nanocrystalline Alloys

机译:退火对(Fe0.4Co0.6)79Nb3B18纳米晶合金的结构和软磁性能的影响

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摘要

The soft magnetic properties of Fe-based nanocrystalline alloys are determined by their grain size. In the present article, the (Fe0.4Co0.6)79Nb3B18 nanocrystalline alloys have been successfully prepared by isothermal annealing. The variation of soft magnetic properties as a function of annealing temperature and incubation time is investigated in detail. Two distinct crystallization behaviors were found for the (Fe0.4Co0.6)79Nb3B18 alloys. The initial nanocrystallization products comprise a mixture of α-Fe(Co), Fe2B, and Fe23B6-type crystalline metastable phases, and the final crystallization products are composed of α-Fe(Co), Fe2B, and Fe3B crystalline phases. The grain size decreases first and then increases with the increasing annealing temperature in the range of 764–1151 K, and a fine grain size with mean grain size of 12.7 nm can be achieved for alloys annealed at 880 K. As the annealing temperature increases from 764 K to 1151 K, the saturation magnetization increases first and then decreases without a significant increase of the coercivity. The alloys annealed at 880 K exhibit the optimized soft magnetic properties with high Ms of 145 emu g−1 and low Hc of 0.04 Oe.
机译:铁基纳米晶合金的软磁性能取决于其晶粒尺寸。本文通过等温退火成功制备了(Fe0.4Co0.6)79Nb3B18纳米晶合金。详细研究了软磁性能随退火温度和孵育时间的变化。对于(Fe0.4Co0.6)79Nb3B18合金,发现了两种不同的结晶行为。最初的纳米结晶产物包括α-Fe(Co),Fe2B和Fe23B6型结晶亚稳的混合物,最终的结晶产物由α-Fe(Co),Fe2B和Fe3B结晶相组成。随退火温度的升高,在764–1151 K范围内,晶粒尺寸先减小然后增大,对于880 K退火的合金,可以实现平均晶粒尺寸为12.7 nm的细晶粒尺寸。在764 K到1151 K之间,饱和磁化强度先增大,然后减小,而矫顽力没有明显增加。在880 K退火的合金表现出最佳的软磁性能,高Ms为145 emu g -1 ,低H c 为0.04 Oe。

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