Fe_73.5Cu₁Nb₃Si_13.5B₉合金の磁気特性の熱処理による変化

抄録

The typical nanocrystalline Fe_73.5Cu₁Nb₃Si_13.5B₉ alloy called “Finemet” has been studied in regard to the dependence of the magnetic properties on the annealing condition and the relationship between the magnetic properties and the formed phase microstructure.
The annealing condition under which the bcc phase is formed in the alloy leads to excellent soft megnetic properties. However, the formation of a compound phase deteriorates soft magnetic properties. The residual amorphous phase appears to decrease with rising annealing temperature. The small magnetostriction and the ultrafine grain structure lead to excellent soft magnetic properties. The grain boundary phase which has lower magnetic induction than the gain phase influences soft magnetic properties.