Co-Fe合金の減衰能と磁気弾性的性質に及ぼす熱処理効果

Abstract

The damping capacity and magnetoelastic properties were investigated for 64 mass%Co-Fe and 68 mass%Co-Fe alloys. The alloys were heat-treated for 7.2 ks at 1123 K, and then cooled with and without magnetic field of 16 kA/m. Measurements of the logarithmic decrement (δ) and ΔE effect (ΔE⁄E0) were carried out using a cantilever method, and the magnetic hysteresis loop was measured using a direct current BH tracer. The δ and ΔE⁄E0 of alloys heat-treated without a magnetic field showed low values; the magnetic hysteresis loop exihibited a “bulge” in the low magnetic field range and the coercive force (Hc) value was relatively large. The δ and ΔE⁄E0 values of alloys heat-treated in a magnetic field were considerably higher; the magnetic hysteresis loop had a “normal” shape and the Hc value was small. This indicates a close relationship between the damping capacity and magnetoelastic properties of the alloys.