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Microstructure of Differently Annealed NanocrystallineFe_(72.7)cu_1nb_(1.8)Mo_2Si_(13)B_(9.5) Alloy

Journal of Materials Science & Technology 1998年第4期14卷 327-330页

作者： YanZhong ZHANG and Huijuan JIN (Shanghai Key Lab. of Metallic Functional Materials, Shanghai Iron and Steel Research Institute,Shanghai 200940, China) Shanghai Key Lab. of Metallic Functional Materials Shanghai Iron and Steel Research Institute Shanghai 200940 China

The microstructure of differently annealed nanocrystalline Fe72.7cu1nb1.8Mo2Si13B9.5 alloy was investigated by using Mssbauer spectroscopy and transmission electron microscope. The specimens were isochronally annealed at temperatures between 480℃ and 600℃ for 0.5 h. The experimental results show that the microstructure mainly consists of the nanoscale bcc α-Fe(Si) grains and the residual amorphous matrix phase. A trace paramagnetic phase was found for annealing about above 500℃. The volume fraction of cr-Fe(Si) grain increases with increasing annealing temperature, whereas the average size of grain is almost unchanged above 480℃ up to 580℃. The calculated thickness of the intergranular layer of the residual amorphous matrix clearly decreases with increasing annealing temperature.

关键词： Mo2Si Microstructure of Differently Annealed NanocrystallineFe Si Alloy cu1nb

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Magnetic Properties and Applications of Newly-developed Fe_(73.5)cu_1nb_(1.5)V_(1.5)Si_(13.5)B_9 Alloy

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Journal of Materials Science & Technology 1998年第6期14卷 538-542页

作者： Yanzhong ZHANG (Major R&D Lab. for Functional Metal Materials, Shanghai Iron and Steel Research Institute, Shanghai 2O0940, China) Major R and D Lab. for Functional Metal Materials Shanghai Iron and Steel Research Institute Shanghai 200940 China

The synthetical soft magnetic properties including d.c. and a.c. magnetic properties and pulse magnetic property are reported for a newly-developed nanocrystalline Fe73.5cu1 nb1.5V1.5Si13.5B9 alloy The new alloy possesses high d.c. relative initial permeability of 12.5×104 and low coerciv ity of 0.54 A/m. Under the conditions of Bm=0.3 T, f=100 kHz and Bm=0.2 T, f=200 kHz the core losses of the new alloy are 543 kW·m-3 and 834 kW.m-3, respectively which can be compa rable with those of nanocrystalline Fe73.5cu1nb3Si13.5B9 alloy. The analyses of core losses have been carried out in the wider range of f=20～104 kHz and Bm=0.0025～0.8 T and the approxi mate expression P(kW·m-3)=1.803 B:f1.77 has been obtained. The analyses of core losses in the range of f=20～104 kHz and Bmf=(10～40)×103(***) have shown that the core loss and the corresponding amplitude permeability roughly vary as P = 2.347×10-6(Bmf)1.97f-0.2231 and μa = 9.56× 105f-0.7464, respectively for the given product B.f. Some practical applica tions have also been mentioned.

关键词： cu1nb Si Magnetic Properties and Applications of Newly-developed Fe B9 Alloy

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