Structure and properties of melt-spun iron-silicon alloy filaments having single crystalline structure
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Melt-spun iron-silicon (Fe-Si) alloy filaments were obtained by a rapid solidification method using an in-rotating-water spinning apparatus. The silicon content in the alloy composition was selected to be about 6.5% by weight, which is expected to have no magnetostriction and to show the lowest coercive force in the magnetic field. Heat-treated filaments were also investigated in terms of the structure and the mechanical and magnetic properties. It was found that the cross-sectional areas and structures of as-spun filaments were affected by processing conditions, such as spinneret diameter, throughput, etc. In the case of the filaments with diameters less than about 90 μm, well-grown structures having primary dendrite arms oriented towards the direction of the filament length, can be observed in place of the polycrystalline structure. By means of high-temperature heat treatment, the filaments with the above structure were found to show single-crystalline structure without any clear boundary. The single-crystalline filaments were found to have good ductility to bending through 180 ° and excellent magnetic properties such as an almost perfect rectangular loop, low coercive force, and high saturation magnetic flux density in the d.c. magnetization curve.
KeywordsCoercive Force Rapid Solidification Silicon Content Primary Dendrite Polycrystalline Structure
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