熱間加工Nd-Fe-B磁石の塑性歪と磁気特性

概要

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Anisotropic Nd-Fe-B magnets can be processed by two different methods. One is traditional powder metallurgy technique in which pulverized particles are aligned by external magnetic field, and the other is melt spinning and hot deformation technique in which crystallographic alignment is induced by plastic deformation. In this report, authors intend to clarify which type of deformation will be favorable to obtain highly anisotropic magnets in the latter technique.Specimens were prepared by several forms of hot deformation (upsetting, backward boring extrusion, forward ring extrusion and bar extrusion) from melt spun ribbons of composition Nd13.5Fe80.5B6.0. Magnetic properties were measured for three orthogonal directions. Plastic strains were estimated by calculation based on a simple model.Magnetic properties, especially remanences, are dependent on the calculated strains of corresponding directions. It is found that highly anisotropic magnets can be obtained in case that hot deformation is conducted under the conditions in which one of the three directional strains is compressive and the others are tensile.
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