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研究生:郭柏宏
研究生(外文):Po-Hung Kuo
論文名稱:Fe-Mn-Si-B-Nb 非晶質合金玻璃形成能力與軟磁性質之研究
論文名稱(外文):The Glass Forming Ability and Soft Magnetic Properties of Fe-Mn-Si-B-Nb Amorphous Alloys
指導教授:陳適範陳適範引用關係林於隆
口試委員:林新亮王錫九薄慧雲
口試日期:2012-07-03
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:材料及資源工程系研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:94
中文關鍵詞:非晶合金玻璃形成能力軟磁性質
外文關鍵詞:Amorphous alloyGlass forming abilitySoft magnetic properties
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本研究藉由添加微量的鈮(Nb)來探究其對Fe-Mn-Si-B金屬玻璃之玻璃形成能力及軟磁性質之影響。Fe75Mn3Si10B12-xNbx (X=0、1、2、3及4 at.%)母合金的製備係使用電弧熔煉爐在氬氣氛下進行,接著以單輥熔射旋淬法(single roller melt-spinning method)製備五元非晶合金薄帶。利用掃描式電子顯微鏡(SEM)及X光繞射儀(XRD)進行顯微結構分析,結果顯示當Nb的添加在0~4 at.%時,在XRD圖譜上會產生寬廣的繞射峰,並以SEM與EDS輔證Fe-Mn-Si-B-Nb合金之結構均勻屬於非晶質相。另以示差掃描熱分析儀(DSC)檢測各項特性溫度如玻璃轉換溫度(Tg)、結晶化溫度(Tx)等可發現,當Nb的添加在2 at%時具有最寬廣的過冷液態區間ΔTx (=Tx-Tg)、Trg (=Tg/Tm or Tg/Tl)及γ表示該成分下具有較佳的玻璃形成能力;此外,當Nb添加量於2 at.%時,以震動樣品試驗儀(VSM)量測,得知具有最佳的軟磁性質;另外透過熱磁分析儀(TMA)的量測,可得到各成分的居禮溫度(Tc)。第二階段實驗分別對薄帶進行350℃及450℃各3分鐘之退火處理,使薄帶產生結晶晶粒,再以VSM、XRD及SEM探討退火後軟磁性質及結構的變化,並在450℃退火證實鈮有抑制晶粒成長的作用。最後由實驗結果得知,添加Nb可有效改善Fe-Mn-Si-B 非晶合金的玻璃形成能力並保持良好的軟磁性質。

In this investigation, we explored the effects of a small Niobium(Nb) addition in the glass forming ability and remained the soft magnetic properties of Fe-Mn-Si-B amorphous alloy. Multi-component alloy ribbons with compositions of Fe75Mn3Si10B12-xNbx (X=0、1、2、3 and 4 at.%) were synthesized by the single roller melt-spinning method. To examine the glass transition temperature(Tg), crystallization temperature(Tx) and Curie temperature(Tc), the as-cast ribbons was measured with a differential scanning calorimetry(DSC) at a heating rate of 0.33 K/s. Microstructure were examined by X-ray diffractometer(XRD) and scanning electron microscopy(SEM). The saturation magnetization(Ms) and coercive force(Hc) were examined by a vibrating sample magnetometer(VSM) in an applied magnetic field 7000 Oe. To examine the Curie temperature(Tc) and magnetic phase with a thermal gravimetric analyzer(TMA) at a heating rate of 0.33 K/s and in an applied magnetic field 110 Oe. We could observe that the broaden peaks appered when Nb addition were 0~4 at% by XRD and SEM results. The maximum ΔTx (= Tx-Tg) value was 97 K for the 2 at% Nb addition by DSC analysis. In addition, the Ms decreased from 1.45 T to 1.02 T, and the minimum Hc value was 5.89 A/m for the 2 at% Nb. In condition, the 2 at% Nb addition showed the best glass forming ability, and still keep good soft magnetic properties. Annealing the amorphous ribbons at 350℃ and 450℃, using VSM、XRD and SEM to analyze soft magnetic propertiesand microstructure. It was examined that addition of Nb could inhibit the growth of grain at 450℃. The small addition of Nb was very effective in improving glass-forming ability and remained the soft magnetic properties of Fe-Mn-Si-B alloys.

中文摘要……………………………………………………………………………….Ⅰ
英文摘要……………………………………………………………………………….Ⅱ
誌謝…………………………………………………………………………………….Ⅲ
目錄…………………………………………………………………………………….Ⅳ
表目錄………………………………………………………………………………….Ⅶ
圖目錄………………………………………………………………………………….Ⅷ
第一章 緒論………………………………………………………………………….. 1
1.1 前言…………………………………………………...…………………………….1
1.2 研究動機與目的……………………………………………………………………4
第二章 文獻回顧與理論基礎……………………………………………………….. 7
2.1 非晶質合金的發展歷史……………………………………………………………7
2.2 非晶質合金的種類………………………………………………………………..11
2.3 非晶質合金的形成條件…………………………………………………………..12
2.3.1 實驗歸納法則………………………………………………………………...12
2.3.2 熱力學觀點……………………………………………………………….......14
2.3.3 結構觀察………………………………………………………………...........14
2.4 非晶質合金之製造方法…………………………………………………………..14
2.5 非晶質合金之熱力學特性………………………………………………………..17
2.5.1 非晶質之平衡………………………………………………………………...17
2.5.2 玻璃轉換溫度與結晶化溫度…………………………………………….......18
2.5.3 居禮溫度………………………………………………………………...........20

2.6 非晶質合金之熱力學特性………………………………………………………..21
2.6.1 臨界冷卻速率………………………………………………………………...21
2.6.2 過冷液態區間…………………………………………………………….......21
2.6.3 簡化玻璃轉化溫度……………………………………………………...........22
2.6.4 深共晶點……………………………………………………………………...24
2.6.5 參數γ….………………………………………................................................25
2.6.6 參數ω…………………………………………………...………….................25
2.6.7 玻璃形成能力參數的修正…………………………………………………...25

2.7 非晶質合金之熱力學特性………………………………………………………..26
2.7.1 機械性質………………………………………………………………...........30
2.7.2 抗蝕性質………………………………………………………………….......32
2.7.3 軟磁性質………………………………………………………………...........32
2.7.4 其他性質……………………………………………………………………...35

2.8 非晶質合金之熱力學特性………………………………………………………..35
2.8.1 非晶質磁性的來源…………………………………………………………...36
2.8.2 磁性的分類……………………………………………………………….......37
2.8.3 磁異向性………………………………………………………………...........39
2.8.4 磁區結構與磁滯曲線………………………………………………………...40
2.8.5 非晶質之軟磁性………………………………………………………….......43

2.9 成分說明…………………………………………………………………………..44

第三章 實驗流程與方法…………………………………………………………… 45
3.1 實驗流程……………..……………………………………………………………45

3.2 合金薄帶之製備…………………………………………………………………..46
3.2.1 合金成分配製………………………………………………………………...46
3.2.2 合金熔煉………………………………………………………………….......46
3.2.3 製作合金薄帶…………………………………………………………...........47
3.2.4 合金薄帶之熱處理…………………………………………………………...48




3.3 材料分析…………………………………………………………………………..49
3.3.1 X光繞射儀……………...…………………………………………………...49
3.3.2 掃描式電子顯微鏡……………………………………………………….......49
3.3.3 示差掃描熱分析儀……………………………………………………...........50
3.3.4 熱重分析計…………………………………………………………………...51
3.3.5 振動樣品磁力儀……………………………………………………………...53

第四章 結果與討論………..……………………………………………………….. 55

4.1 試片外觀之觀察…………………………………………………………………..55
4.1.1 母合金鑄錠之外觀…………………………………………………………...55
4.1.2 合金薄帶之外觀………………………………………………………….......56

4.2 Nb的添加對於Fe-Mn-Si-B合金之結構與成份分析……………………………...57
4.2.1 母合金鑄錠之結構與成份分析……………………………………………...58
4.2.2 鑄態合金薄帶之結構與成份分析……………………………………….......59
4.2.3 熱處理後合金薄帶之結構與成份分析……………………………………...63
4.2.4 高溫晶化後合金薄帶之結構與成份分析…………………………...............69

4.3 Nb的添加對於Fe-Mn-Si-B合金之結構與成分分析………………………….…..72
2.5.1 非晶質之平衡………………………………………………………………...72
2.5.2 玻璃轉換溫度與結晶化溫度…………………………………………….......74

4.4 Nb的添加對於Fe-Mn-Si-B合金之軟磁性質影響….……………………………..76
4.4.1 鑄態合金薄帶之軟磁性質分析……………………………………………...77
4.4.2 熱處理後合金薄帶之軟磁性質分析……………………………...................81

第五章 結論………………………………………………………………………….86

參考文獻……………………………………………………………………………….88


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