Fe-Nb-B-Hf非晶質合金玻璃成形及軟磁性質之研究

The Glass Forming Ability and Soft Magnetic Properties of Fe-Nb-B-Hf Amorphous Alloys

簡幼軒(Yu-Shun Chien)

指導教授 ： 陳適範

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2009年)

摘要

本研究以添加適量鉿(Hf)來改善鐵鈮硼非晶質合金之玻璃形成能力並維持良好的軟磁性質。以單輥熔射旋淬法製備成份為(Fe72Nb4B24)100-xHfx (X=0，1，2，3，4，5及6 at.%)之四元合金薄帶。熱性質分析是以加熱速率為0.33 K/s之示差掃描熱分析儀(DSC)檢測鑄態合金薄帶的玻璃轉換溫度(Tg)、結晶溫度(Tx)、熔化溫度(Tm)、液相點(Tl)等特性溫度點作為判斷依據。結構分析則藉由X光繞射儀(XRD)及掃描式電子顯微鏡(SEM)鑑定試片之微觀結構。軟磁性質的量測則以外加磁場2000 Oe之振動樣品磁力儀(VSM)進行試片的飽和磁化強度(Ms)及矯頑磁力(Hc)分析。居里溫度(Tc)則是利用外加磁場110 Oe及加熱速率為0.33 K/s之熱重分析計(TMA)量測之。當Hf含量由0 at%增加到4 at%時，可藉XRD及SEM觀察到合金薄帶皆為非晶質結構；DSC的結果則顯示當Hf的含量為3at%時，合金薄帶的過冷液態區間為最大的80.69 K，而Hf添加量為2 at%時則有最大的Trg以及γ值；此外，隨著Hf含量由0 at%增加至4 at%，Tc由545.70 K減至417.22 K，Ms則由1.15 T減至0.65 T，Hc由26.57 A/m減至12.81 A/m再向上增加至46.87 A/m。由實驗結果可得知，添加Hf在2 at%時會有最佳的玻璃成形能力並維持一定的軟磁性質，因此鉿的添加可有效的改善Fe-Nb-B非晶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軟磁性質

並列摘要

The effects of glass forming ability and soft magnetic properties by Hafnium addition on Fe-Nb-B amorphous alloy was investigated in this study. The multi-component alloy ribbons with compositions of (Fe72Nb4B24)100-xHfx (X=0,1,2,3,4,5 and 6 at.%) were prepared by single roller melt-spinning method, and the alloy rods were prepared by inductance casting. Thermal properties were measured by a differential scanning calorimetry (DSC) and high-temperature differential scanning calorimetry (HTDSC) at a heating rate of 0.33 K/s. Microstructure was examined by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The soft magnetic properties, for instance, coercive force (Hc) and saturation magnetization (Ms) were examined by vibrating sample magnetometer (VSM). The thermal magnetometry analyzer (TMA) which at a heating rate of 0.33 K/s and in an applied magnetic field 110Oe was used to measured the Curie temperature (Tc) and the magnetic phase. In conclusion, the alloy ribbons showed amorphous structure in X=1 to 4, and the X=2 ribbon revealed the best glass forming ability. On the other side, the Ms decreased from 1.15 T to 0.65 T, the Tc decreased from 545 K to 417 K ,and the Hc has a minimum 12.81 A/m of the X=2 ribbon. In brief, the 2 at% Hf addition showed the best glass forming ability, and it revealed the best glass forming ability and still keep good soft magnetic properties. The addition of Hafnium could increase GFA and still maintain good soft magnetic properties.

並列關鍵字

Amorphous alloy ； Glass forming ability ； Soft magnetic properties

參考文獻

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