HIGH-TEMPERATURE AC MAGNETIC PROPERTIES OF NANOCRYSTALINE FINEMET ALLOYS WITH Co ADDITION
来源期刊：Acta Metallurgica Sinica2007年第5期
论文作者：S.S. Zhao R.C. Ye F.R. Wan X. Liu Y.Q. Chang Y.H. Ding Y. Long
Key words：high temperature; nanocrystalline; permeability spectra;
Abstract: High-temperature AC magnetic properties for (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson peak appears only in the amorphous alloy when Ta ≤ 703K. As Ta increases above 733K, the real part of the complex initial permeability μi' descends gradually, μi' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta=763K has been found to maintain a stable high value of 950 up toa frequency of～ 1 × 105Hz Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.
S.S. Zhao1，R.C. Ye1，F.R. Wan1，X. Liu1，Y.Q. Chang1，Y.H. Ding1，Y. Long1
(1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2.College of Science, Tianjin University of Technology, Tianjin 300191, China)
Abstract:High-temperature AC magnetic properties for (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson peak appears only in the amorphous alloy when Ta ≤ 703K. As Ta increases above 733K, the real part of the complex initial permeability μi'' descends gradually, μi'' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta=763K has been found to maintain a stable high value of 950 up toa frequency of～ 1 × 105Hz Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.
Key words:high temperature; nanocrystalline; permeability spectra;
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