Fe-Si-B-Dy非晶合金的形成與軟磁性質

Formation and Magnetic Properties of Fe-Si-B-Dy Amorphous Alloy

林新亮(Hsing-Liang Lin) ； 陳適範(Shih-Fan Chen) ； 簡幼軒(Yu-Hsuen Chien) ； 薄慧雲(Hui-Yun Bor)

《鑄造工程學刊》 34卷4期 (2008/12) Pp. 19-24

https://doi.org/10.29809/JTFS.200812.0003

摘要

本研究以添加微量鏑(Dy)來改善Fe-Si-B非晶質合金之玻璃形成能力及軟磁性質。利用單輥熔射旋淬法(the single roller melt-spinning method)製備成分為(Fe0.75Si0.10B0.15)(下標 100-X)Dy(下標 X)(X=0, 0.5, 1, 2 at%)之多元合金薄帶。當鏑(Dy)含量由x=0 at%增加到x=2 at%時，於x=1 at%時開始在DSC曲線中出現Tg溫度，且由789 K增加到x=2 at%的835 K，而Tx溫度由836 K增加到886 K，x=2 at%時非晶薄帶的ΔTx (=Tx-Tg)值為最大的51 K。隨著Dy含量的增加T(下標 C)溫度由700 K減至653 K，飽和磁化強度(saturation magnetization)MS由1.53 T減至1.28 T，矯頑磁力(coercivity)H(下標 C)由40.38減至20.85 A/m。由實驗結果得知，添加微量的鏑(Dy)，導致在結晶前出現玻璃轉換溫度及產生一穩定的過冷液態區，能有效的改善Fe-Si-B合金的玻璃形成能力並保持良好的軟磁性質。

關鍵字

非晶質合金 ； 玻璃形成能力 ； 磁性

並列摘要

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.

並列關鍵字

Amorphous alloy ； Glass forming ability ； Magnetic properties