The cross-section pattern of Fe-based alloy ribbon (Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 ) annealed at different temperatures was investigated by AFM (atomic force microscope), and the effect mechanism of Nb and Cu in Fe-based alloy ribbon annealing was analyzed with XRD diffraction crystal analysis technique and other research results. New concepts of encapsulated grain, Nb vacancy cluster, Nb-B atom cluster and so on were proposed and used to describe the formation mechanism of α-Fe (Si) nanocrystal. Finally, a three-phase (separation phase, encapsulated phase and nanocrystalline phase) interconnected structure model in Fe-based nanocrystalline alloy was established.amorphous, crystallization, nanocrystal, AFM, three-phase structure model Ever since the FINEMET alloy material represented by Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 was prepared by amorphous crystallization by Yoshizawa et al. [1] , its excellent comprehensive soft magnetic properties and giant magneto-impedance effect [2][3][4][5][6] have received great attentions from the scientific community. The special structure and excellent magnetic properties of FINEMET alloy are closely related to the five components of the alloy. The influences of Cu and Nb components on alloy structure and performance are especially of research interest since they are not only important in theory but also practical for material performance improvement and new technique development. Much research has done on the microstructure of nanocrystal by X-ray diffraction, transmission electron microscope, Mössbauer spectrum, EXAFS, and positron annihilation, and much valuable outcome has achieved. The structure and crystallization of FINEMET alloy are almost clear. However, the formation mechanism of nanocrystal and the mechanism of material performance improvement after nanocrystalline formation are still lack of clear images. Many
The mesostructure at the cross section of the Fe-based nanocrystalline (Fe73.sCujNb3Si13.sB9) ribbon was observed with atomic force microscopy (AFM). An apparent mesostructural difference was found between the sticking roller face area (SRFA) and the free face area (FFA) of the ribbon crystallized after annealing. In SRFA there is a preponderance of rough grain gathering in longitudinal arrangement, while in FFA a fine grain gathering arranged transversely dominates. This phenomenon could be due to the different residual stress remained in the different areas of the amorphous ribbon resulting from the single-roller quenching technique.
The mesostructure of Fe-based (Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 ) nanocrystalline ribbon was observed by investigation of the section samples and the molted samples with atomic force microscopy (AFM). The section of the Fe-based crystalline ribbon can be divided into five areas. An apparent mesostructural difference was found in the different areas of the ribbon crystallized after annealing. In RFA, the coarse grains gathering in longitudinal arrangement, while in FFA the fine grains gathering arranged transversely dominates. The size of crystalline grain increases from about 10 nm to about 300 nm with the area gradating from the free surface to the rolled surface. The main reason for such mesostructural difference could be due to the different residual inner stress in the different areas of the amorphous ribbon.
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