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本文概述了HITPERM型软磁合金Fe(Co)-M-B-Cu(M=Nb, Zr, Hf等)的研究进展,从合金设计、合金制备、微结构分析、性能测试与优化等方面阐述了HITPERM合金的研究概况,并简要介绍了其在高温条件下的应用现状。 相似文献
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D. M. KEPAPTSOGLOU M. PALUGA† M. DEANKO† D. MÜLLER† C. F. CONDE‡ E. HRISTOFOROU D. JANIKOVI† & P. VEC† 《Journal of microscopy》2006,223(3):288-291
The effect of the substitution of Fe by Co on the enhancement of glass‐forming ability limits and subsequent nanocrystallization was studied in a rapidly quenched amorphous system (FexCoy)79Mo8Cu1B12 for y/x ranging from 0 to 1. The effect of Cu on nanocrystallization was investigated by comparison with Cu‐free amorphous Fe80Mo8B12. Systems partially crystallized at the surface layer were prepared for y/x = 0 using different quenching conditions. The effect of heat treatment of master alloys used for ribbon casting was also assessed. The microstructure and surface/bulk crystallization effects were analysed using transmission electron microscopy and electron and X‐ray diffraction in relation to the expected enhancement of high‐temperature soft magnetic properties, drastically reduced grain sizes (~5 nm) and Co content. Unusual surface phenomena were observed, indicating the origin of possible nucleation sites for preferential crystallization in samples with low Co content. 相似文献
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M E McHenry M A Willard H Iwanabe R A Sutton Z Turgut A Hsiao D E Laughlin 《Bulletin of Materials Science》1999,22(3):495-501
Conventional physical metallurgy approaches to improve soft ferromagnetic properties involve tailoring chemistry and optimizing
microstructure. Alloy design involves consideration of induction and Curie temperatures. Significant in the tailoring of microstructure
is the recognition that the coercivity, (H
c) is roughly inversely proportional to the grain size (D
g) for grain sizes exceeding ∼0·1−1 μm (where the grain size exceeds the Bloch wall thickness,δ). In such cases grain boundaries act as impediments to domain wall motion, and thus fine-grained materials are usually harder
than large-grained materials. Significant recent development in the understanding of magnetic coercivity mechanisms have led
to the realization that for very small grain sizesD
g<∼100 nm,H
c decreases sharply with decreasing grain size. This can be rationalized by the extension of random anisotropy models that
were first suggested to explain the magnetic softness of transition-metal-based amorphous alloys. This important concept suggests
that nanocrystalline and amorphous alloys have significant potential as soft magnetic materials. In this paper we have discussed
routes to produce interesting nanocrystalline magnets. These include plasma (arc) production followed by compaction and primary
crystallization of metallic glasses. A new class of nanocrystalline magnetic materials, HITPERM, having high permeabilities
at high temperatures have also been discussed. 相似文献
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