表面結晶化したFe基非晶質薄帯の磁気特性に及ぼす張力印加効果  [in Japanese] Effect of Tension on the Magnetic Properties of Surface-Crystallized Fe-Based Amorphous Ribbons  [in Japanese]

Fe-based amorphous alloys containgin Al or Ti as impurties become surface-crystallized during casting, with a resultant deterioration in their soft magnetic properties. This phenomenon is known to be caused by compressive stress induced by surface crystallization, but there have been few systematic investigations of this compressive stress. In the present study, the compressive stress was found to range from 1 to 15 MPa, and is proportional to the ratio of the surface crystalline layer thickness to the ribbon thickness. The deterioration of the core losses has been evaluated. This result shows that the deterioration is mainly caused by the compressive stress induced by the surface crystalline layer.