Fe-Si-B-Dy非晶合金的晶化行為及軟磁性質之研究

本研究以添加微量鏑(Dysprosium)來改善Fe75Si10B15非晶合金之玻璃形成能力並保持良好的軟磁性質。利用單輥熔射旋淬法製備成份為(Fe0.75Si0.10B0.15)100-XDyX(X=0，0.5，1及2 at.%)之四元合金薄帶。以加熱速率為0.33 K/s之示差掃描熱分析儀(DSC)及示差熱分析(DTA)檢測鑄態合金薄帶的玻璃轉換溫度(Tg)、結晶溫度(TX)、熔解溫度(Tm)及液態溫度(Tl)。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。以外加磁場5000 Oe之振動樣品磁力儀(VSM)量測試片的飽和磁化強度(MS)及矯頑磁力(HC)。以外加磁場100 Oe及加熱速率為0.33K/s之熱重分析計(TMA)量測試片之居里溫度(TC)及磁性相。當Dy含量由0 at.%增加到2 at.%時，於1 at.%開始在DSC曲線中出現較明顯Tg點，當Dy添加為1 at.%時，合金薄帶的Tg 、TX 及Tl分別為812、854及1439 K，Dy添加為2 at.%時，其Tg 、TX 及Tl分別為835、886及1435 K，過冷液態區間(ΔTX)達到51K， Trg及γ值分別為0.58及0.39。隨著Dy含量的增加TC由714 K減至625 K，MS由1.58 T減至1.50 T，HC由27.77 A/m減至22.28 A/m。由實驗結果得知，Dy添加量高於1 at.%時，於結晶析出前產生一穩定的過冷液態區，能有效的改善Fe-Si-B-Dy非晶合金的玻璃形成能力。退火結晶過程中當Dy=0.5、1及2 at.% 時,其初晶相為α-Fe，Dy=0時初晶相為Fe3Si。Dy的添加導致過度金屬間相鄰最近距離的增加，意味著結構組織的無序度增加，可加強退火過程中金屬玻璃的熱穩定性。顯微硬度隨著Dy得添加有增大之趨勢，非晶態時最大硬度值為1398 HV(Dy=2 at.%)，晶態時最大硬度值為1446 HV(Dy=1 at.%)。當合金薄帶被加熱至750K時，產生結構遲豫的現象，於Dy=0.5 at.%時，其MS及HC分別為1.85 T及8.28 A/m，Dy=1 at.%時，其MS及HC分別為1.80 T及8.59 A/m。於退火溫度為750至960K時，當Dy=1及2 at.%造成磁晶異向性能降低，意味著α-Fe(Si)相的晶粒成長受到抑制且Fe3B及Fe2B相的析出受到延緩。

關鍵字

非晶合金；玻璃形成能力軟磁性質

並列摘要

Multi-component alloy ribbons with compositions of (Fe0.75Si0.10 B0.15)100-XDyX (X=0, 0.5, 1 and 2 at.%) are prepared by single roller melt-spinning method. The structure is fully amorphous, as demonstrated by XRD investigation. The effects of Dy addition on GFA improvement and soft magnetic properties of Fe75Si10B15 alloy systems are investigated. The glassy structure is found stabilized by Dy addition. The Tg, TX and Tl for 1 at.% Dy added alloy ribbon are 812K, 854K and 1439K, respectively. The Tg and TX increase to 835K and 886K, Tl decrease to1435K for 2at.% Dy containing alloy ribbon. As high as 51K of large supercooled liquid range (ΔTX), 0.58 of Trg and 0.39 of γ is observed. It shows that the glass formation ability is improved by adding over 1at.% Dy to suppress crystalline phase formation. The primary crystalline phase is Fe3Si for nor Dy addition and α-Fe for ribbons with 0.5, 1 and 2 at.% Dy addition. The α-Fe and residual amorphous phase appear in the annealing structure with 1at.% Dy addition after the annealing temperature at 855 K. The TM–TM nearest neighbor distance (NND) increases as a result of addition of Dy in the system, it is implied that the addition of Dy results in an increase in the topological disorder. The microhardness is increased with addition Dy at various annealing temperature, the maximum value is 1398 HV for addition of 2 at.% Dy at amorphous state and 1446 HV for addition of 1 at.% Dy at crystalline state. The amorphous alloy ribbons exhibit good soft magnetic properties with Curie temperature (TC) between 700 K and 653 K, high saturation magnetization (MS) between 1.58 and 1.50 T and the coercive force (HC) of 27.77~22.28 A/m at the as-quenched state, when the Fe-Si-B-Dy amorphous alloy ribbons were heated to 750 K, owing to the structural relaxation results in the excellent soft magnetic properties, the MS and HC is 1.85T and 8.28 A/m for addition 0.5 at.% Dy after 623K annealing,1.8T and 8.59 A/m for addition ribbons with 1 at.% Dy at the annealing temperature 623K. The magnetocrystalline anisotropy is decreased with the addition of 1 and 2 at.% Dy at interval annealing temperature 750-960 K , it is implied that the grain growth of α-Fe(Si) phase is inhibited and the Fe3B or/and Fe2B crystallization is delayed.

並列關鍵字

Amorphous alloys ； Glass forming ability ； Soft magnetic properties.

參考文獻

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國際替代計量

Fe-Si-B-Dy非晶合金的晶化行為及軟磁性質之研究

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