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| 1 | Effects of annealing condition and Al content on novel Fe_(73.5)Si_(13.5)B_9Cu_1Nb_(3-x)Al_x alloys显示文摘The annealing condition, Al content, and field amplitude dependences of the complex permeability for Nb-poor Finemet type alloys, Fe73.5Si13.5B9Cu1Nb3-xAlx (x = 0, 0.5, 1.5, 2.0, and 3.0), were investigated using an impedance analyzer and X-ray diffraction. The results show that different Al contents lead to different optimum annealing conditions, and the Al content exerts a distinct effect on microstructure thus resulting in a variety of real permeability value. For the samples annealed at 793 K for 0.5 h, the real permeability increases with an in- crease in Al content when the Al content is below 2.0 at.%; as for those annealed at 793 K for 1 h and at 813 K for 0.5 h, an overall increase in real permeability can be obtained compared to those annealed at 793 K for 0.5 h. The permeability under different field amplitudes is also studied and it is found that the relaxation frequency in the lower frequency region tends to moving toward a higher frequency with an increase in field amplitude. All these might be because of the role of Nb in the annealing process and the solubility of Al in the amorphous matrix and nanocrystallized crystallites. | LIU Haishun DU Youwei MIAO Xiexing HAN Kui SHEN Xiaopeng BU Wankui | 2008 | Rare Metals2008，27，5： | 0 |
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