Fe-Si-B-Dy非晶合金的形成與軟磁性質

Abstract

In this investigation, we explored the effect of a small dysprosium (Dy) addition in potentially improving the glass forming ability and soft magnetic properties of Fe-Si-B amorphous alloy. Multi-component alloy ribbons with compositions of (Fe0.75Si0.10 B0.15)(subscript 100-X)Dy(subscript X) (X=0, 0.5, 1, 2) were synthesized by the single roller melt-spinning method. Glassy and crystallized structure were examined by X-ray diffraction (XRD). To examine the glass transition temperature (Tg), crystallization temperature (Tx) and Curie temperature (T(subscript C)), the as-quenched ribbon was measured with a differential scanning calorimetry (DSC) and a thermomagnetic analysis (TMA). Magnetic properties were examined by a vibrating sample magnetometer (VSM). The appearance of the glass transition (Tg) until X=1 at%, the Tg and Tx increase from 789 to 835 K and 836 to 886 K, respectively, with increasing Dy content 0.5 to 2 at%. The augmentable rate is more significant for Tx, resulting in a maximum ΔTx(=Tx-Tg) value of 51 K for the 2 at% Dy alloy. The Dy-contenting metallic glassy alloy incurred the Curie temperature (T(subscript C)) was from 700 K to 653 K, the saturation magnetization (M(subscript S)) was from 1.53 to 1.28 T as well as the coercivity (H(subscript C)) was from 40.38 to 20.85 A/m . As the results, adding this minor account of Dy causes the appearance of the glass transition and a supercooled liquid region before crystallization. The small addition of Dy was very effective in improving glass-forming ability and remained the soft magnetic properties of Fe-Si-B alloys.