Relationship between crystallization process and magnetic properties of Fe-(Cu-Nb)-Si-B amorphous alloys

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Abstract
The effect of Cu and/or Nb addition on crystallization processes and soft magnetic properties for Fe‐Si‐B alloys has been investigated. For Fe‐Si‐B, Fe‐Cu‐Si‐B, and Fe‐Nb‐Si‐B alloys annealed at various temperatures, the effective permeabilities were very low and decreased considerably as they crystallized, while for Fe‐Cu‐Nb‐Si‐B alloy annealed at a temperature above Tx , a very good soft magnetic property was obtained. From DTA analysis of Fe‐Cu‐Nb‐Si‐B alloys, it became clear that the combined addition of Cu and Nb expanded largely the temperature range over 100 °C where a single phase of α‐Fe solid solution can exist. Above 580 °C, the second crystalline phase such as Fe2 B and some unidentified phases other than the α‐Fe phase precipitated, and soft magnetic properties deteriorated rapidly. It is concluded that the combined addition of Cu and Nb makes the α‐Fe single phase stable in a broad temperature range, which is considered to be the necessary condition for the superior soft magnetic properties.

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