添加第三元素金對BCT麻田散相在鐵鈀鐵磁性記憶合金的影響

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研究生：	簡孜芸 Chien, Chih-Yun
論文名稱：	添加第三元素金對BCT麻田散相在鐵鈀鐵磁性記憶合金的影響
指導教授：	胡塵滌 Hu, Chen-Ti
口試委員:	胡塵滌吳錫侃楊聰仁
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2012
畢業學年度：	100
語文別：	中文
論文頁數：	126
中文關鍵詞：	形狀記憶合金、磁致伸縮、鐵鈀合金
相關次數：	點閱：3 下載：0
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Fe70Pd30鐵磁性形狀記憶合金同時具有良好雙向形狀記憶效應和高磁致伸縮率而受到重視，然而fcc母相至fct麻田散相相變化溫度過低、及容易因低溫和應力效應誘發非熱彈性bct麻田散相，而喪失形狀記憶特性等問題，在應用上一直無法突破。
本研究針對Fe-30at%Pd合金容易誘發非熱彈性bct麻田散相之缺點進行改善，探討添加第三元素Au的Fe70Pd30-xAux(X=4,5,6)塊材試片經熱鍛造、熱輥壓與熱機處理後在抑制低溫及應力誘發生成非熱彈性bct麻田散相的能力、及相變化溫度的變化，並研究微結構、磁性質、磁伸縮值的改變。
Fe70Pd30塊材試片降至液態氮溫度77K時大量產生非熱彈性bct相，反觀添加Au作為第三元素的試片，直至2K低溫都不會產生非熱彈性bct麻田散相，顯示添加Au能有效抑制低溫所造成的bct生成。並且，Fe70Pd30試片在受機械研磨之小應力下即生成非熱彈性bct相，而添加Au作為第三元素的試片，在機械研磨後仍維持機械研磨前的相組成，說明添加Au能有效抑制應力誘發bct相生成。此種抑制非熱彈性bct相的性質將大幅提昇Fe-30at%Pd合金加工應用的機會。
而Au的添加可提高合金fcc-fct相變化溫度，其中尤以添加5% Au效果最佳，可提升麻田散相變化溫度Ms約45K，並可得最低晶格常數(c/a)比值為0.93。
磁性質部分，飽和磁化量以Fe70Pd30最高，Fe70Pd24Au6最低；矯頑磁場變化趨勢則以Fe70Pd25Au5最高，Fe70Pd30最低 ; 磁伸縮值以Fe70Pd25Au5的723.7 ppm最高。

第一章 緒論    1
1-1前言    1
1-2 研究目的    2

第二章 文獻回顧    3
2-1 鐵磁性形狀記憶合金導論    3
2-2 形狀記憶效應    3
2-3 磁致伸縮    5
2-4 鐵磁性形狀記憶效應    6
2-5 鐵磁性形狀記憶合金的應用    9
2-6 鐵鈀形狀記憶合金文獻回顧    9
2-6-1 鐵鈀合金製程文獻回顧    10
2-6-2 鐵鈀形狀記憶合金相變化研究文獻回顧    11
2-6-3 形狀記憶效應    14
2-6-4 磁性質於磁致伸縮（鐵磁性形狀記憶效應）    15
2-6-5 Fe-Pd合金添加第三元素文獻回顧    17
2-6-6 Fe-Pd 理論計算文獻回顧    18

第三章 實驗步驟與方法    36
3-1 試片製備    36
3-1-1 合金鑄錠製備    36
3-1-2 熱鍛造與熱輥壓    36
3-1-3 熱機處理（Thermal-Mechanical Treatment, TMT）    37
3-2 成份分析    38
3-3 熱式差掃描卡量計（Differential Scanning Calorimetry, DSC）    38
3-4 結構分析與觀察    39
3-4-1 室溫X-ray 繞射分析    39
3-4-2 變溫X-ray 繞射分析    39
3-4-3 光學顯微鏡（Optical Microscope, OM）顯微結構觀察    39
3-5 磁性質量測    40
3-6 磁致伸縮值量測    41
3-7 形狀記憶效應測試    41
3-8 儀器與量測原理    42
3-8-1  X光繞射儀 ( X-Ray Diffractometer )    42
3-8-2  熱示差掃描卡量計 ( Differential Scanning Calormetry )    42
3-8-3  振動樣品磁量儀 (Vibrating-Sample Magnetometer , VSM)    43
3-8-4  超導量子干涉儀 (SQUID)    43
3-8-5 應變規 (Strain Gauge)    44

第四章 結果與討論    53
4-1 試片代號介紹    53
4-2 試片基本性質研究    53
4-2-1  ICP-AES成份定量分析    53
4-2-2  室溫X-ray繞射分析    54
4-2-3  變溫X-ray繞射分析    55
4-2-4  晶格常數與 (c/a) 比值討論    56
4-2-5  光學顯微鏡金相觀察    57
4-2-6  DSC熱分析    59
4-3 溫度誘發bct相變化研究    61
4-4 應力誘發bct相變化研究    62
4-5 磁性質研究    64
4-5-1 磁通量研究（VSM Method）    64
4-5-2 磁化量對溫度循環研究（SQUID Method）    65
4-5-3 磁致伸縮研究    66
4-6 形狀記憶效應研究    68

第五章 結論    116
第六章 參考文獻    118

                                

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