液体急冷Fe-M-Si-Ge (M=Ti, V, Zr, Nb, Ta) およびFe-Hf-Cu合金の結晶粒径と磁気特性

抄録

Grain diameter and magnetic properties of rapidly quenched Fe-M-Si-Ge (M=Ti, V, Zr, Nb, Ta) and Fe-Hf-Cu alloy ribbons were investigated. The grain size of Fe-Ta-Si-Ge alloys decreases rapidly from 2700Å to about 400Å with the addition of Ta up to 3 at%. Coercivity increases rapidly from 2.3 to 30 Oe with the increase of Ta content. For Fe-M-Si-Ge alloy systems, the decreasing of grain diameter and the increasing of coercivity with the addition of M are in order of Ta, Nb, Zr, Ti and V. The grain diameter of Fe-Hf-Cu alloys decreases to about 600Å with the increase of Hf content to 4∼6 at%. The coercivity increases to about 20 Oe with increasing Hf content. Coercivity of these rapidly quenched Fe-based alloys is roughly proportional to the inverse of grain diameter.