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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳志軒 | zh_TW |
dc.contributor.advisor | Chih-Hsuan Chen | en |
dc.contributor.author | 莊昀樸 | zh_TW |
dc.contributor.author | Yun-Pu Chuang | en |
dc.date.accessioned | 2023-10-03T17:18:20Z | - |
dc.date.available | 2023-11-09 | - |
dc.date.copyright | 2023-10-03 | - |
dc.date.issued | 2023 | - |
dc.date.submitted | 2023-08-07 | - |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90715 | - |
dc.description.abstract | 本研究針對Ti30Zr15Hf5Ni35Cu15(下稱Zr15Hf5合金)與Ti30Zr5Hf15Ni35Cu15(下稱Zr5Hf15合金)兩種比例的高熵形狀記憶合金透過置換Zr與Hf的比例來觀察固溶處理與時效處理對於相變態行為、顯微結構、晶體結構與析出物產生何種影響。經過400℃時效處理後,兩者合金相變態溫度皆隨著時間大幅下降;經過500℃時效處理,Zr5Hf15合金相變態溫度也呈現下降趨勢,而Zr15Hf5合金則是先下降後上升;在經過600℃與700℃時效處理後,兩合金皆呈現明顯的上升趨勢。500℃時效處理中,除了原始黑色析出物(Ti,Zr,Hf)2(Ni,Cu),兩種合金都觀察到高密度的白色條狀析出物H相與黑色顆粒狀析出物Ti2Cu的析出現象。而600℃與700℃時效處理中,兩者合金則觀察到白色析出物(Zr,Hf)7Cu10與新生的黑色析出物(Ti,Zr,Hf)2(Ni,Cu)。從析出物分布情形,可以發現Zr15Hf5合金的析出物較多且分佈密集,在600℃與700℃時效處理中更可以看出析出物大範圍的共析狀態,而Zr5Hf15合金則析出物較少,分佈較不密集,共析狀態幾乎只見於晶界區域內。在XRD實驗中,兩者合金的600℃時效處理觀察到Zr7Cu10相與Ti2Cu相等析出相,而700℃時效處理在兩者合金中則觀察到析出物Zr7Cu10相與Ti2Ni相,此部分與SEM觀察結果相同。Zr5Hf15合金的爐冷、固溶、400℃與500℃試片都較Zr15Hf5合金硬,該現象可能是由於Zr5Hf15合金的平均原子半徑差δ值較Zr15Hf5合金大,因此Zr5Hf15合金內部晶格扭曲程度較大,進而導致硬度較高。本研究結果顯示了不同時效溫度下會有不同的顯微結構,並且可以透過置換Zr與Hf比例來調整合金內部的析出物分布情形,為合金設計策略的再建構提供了一個新方向。 | zh_TW |
dc.description.abstract | This study investigated Ti30Zr15Hf5Ni35Cu15 and Ti30Zr5Hf15Ni35Cu15 two high entropy shape memory alloys with the effects of solution treatment and aging treatment on phase transformation behavior, microstructure, crystal structure and precipitates that observed by substituting the ratio of Zr and Hf. After 400°C aging treatment, the phase transformation temperature of both alloys decreased significantly with time; after 500°C aging treatment, the phase transformation temperature of Zr5Hf15 alloy also showed a decreasing trend, while Zr15Hf5 alloy decreased first and then increased; after 600°C and 700°C aging treatment, both alloys showed an obviously increasing trend. During the aging treatment at 500°C, in addition to the original black precipitates (Ti,Zr,Hf)2(Ni,Cu), a high density of white strip-shaped precipitates H phase and black granular precipitates Ti2Cu were also observed in both alloys. After the aging treatment at 600℃ and 700℃, white precipitates (Zr,Hf)7Cu10 and new black precipitates (Ti,Zr,Hf)2(Ni,Cu) were observed in the two alloys. From the distribution of the precipitates, it can be found that the precipitates of Zr15Hf5 alloy are high-densely distributed, for the aging treatment at 600℃ and 700℃, the eutectoid condition of the precipitates can be seen in a large range. However Zr5Hf15 alloy has fewer precipitates with less-densely distribution, and the eutectoid condition is almost only seen in the grain boundary region. In the XRD experiment, the Zr7Cu10 phase and Ti2Cu phase precipitates were observed in the two alloys after 600°C aging treatment, and the Zr7Cu10 phase and Ti2Ni phase were observed in the two alloys after 700°C aging treatment, which is in the same condition as the SEM observation. Zr5Hf15 alloy has higher hardness than Zr15Hf5 alloy in furnace cooling, solid solution, 400°C and 500°C samples. This phenomenon may due to the larger average atomic radius difference δ value of Zr5Hf15 alloy than that of Zr15Hf5 alloy, so that Zr5Hf15 alloy has larger degree of internal lattice distortion, resulting in higher hardness. The results of this study show that there will be different microstructures at different aging temperatures, and the distribution of precipitates in the alloy can be adjusted by substituting the ratio of Zr and Hf, which provides a new direction for the reconstruction of alloy design strategies. | en |
dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-10-03T17:18:20Z No. of bitstreams: 0 | en |
dc.description.provenance | Made available in DSpace on 2023-10-03T17:18:20Z (GMT). No. of bitstreams: 0 | en |
dc.description.tableofcontents | 論文口試委員審定書 i
誌謝 ii 摘要 iv Abstract v 目錄 vii 圖目錄 x 表目錄 xv 第一章 前言 1 第二章 文獻回顧 3 2-1 形狀記憶合金簡介 3 2-2 形狀記憶特性 4 2-2-1 熱彈型麻田散體相變態 4 2-2-2 形狀記憶效應(Shape Memory Effect) 6 2-2-3 超彈性(Superelasticity) 9 2-2-4 彈熱效應(Elastocaloric Effect) 14 2-3 Ti-Ni基形狀記憶合金 15 2-4 不同元素添加對形狀記憶合金之影響 17 2-5 熱循環對合金之影響 22 2-6 高熵合金簡介 24 2-6-1 高熵效應(High Entropy Effect) 25 2-6-2 緩慢擴散效應(Sluggish Diffusion Effect) 27 2-6-3 晶格扭曲效應(Sever Lattice Distortion Effect) 28 2-6-4 雞尾酒效應(Cocktail Effect) 30 2-7 高熵形狀記憶合金簡介 31 2-8 Ti-Ni基高熵形狀記憶合金近年研析 33 2-9 高熵形狀記憶合金之時效處理 35 第三章 實驗方法 39 3-1 合金配置與熔煉 40 3-2 合金之固溶處理與均質化處理 41 3-3 合金之時效處理 42 3-4 相變態溫度試驗(DSC) 43 3-5 場發射槍掃描式電子顯微鏡觀察(SEM) 44 3-6 場發射電子微探儀觀察(EPMA) 44 3-7 穿透式電子顯微鏡觀察(TEM) 44 3-8晶體結構X光繞射儀觀察(XRD) 45 3-9 硬度試驗(Hardness Test) 45 第四章 實驗結果與討論 46 4-1 Zr15Hf5合金之研究結果 46 4-1-1 相變態溫度之實驗結果(DSC) 46 4-1-2 微觀組織之實驗結果(SEM、EDS) 57 4-1-3 析出成分之實驗結果(EPMA) 67 4-1-4 微結構之實驗結果(TEM) 71 4-1-5 晶相結構之實驗結果(XRD) 76 4-1-6 硬度試驗之實驗結果 80 4-2 Zr5Hf15合金之研究結果 82 4-2-1 相變態溫度之實驗結果(DSC) 82 4-2-2 微觀組織之實驗結果(SEM、EDS) 93 4-2-3 析出成分之實驗結果(EPMA) 104 4-2-4 晶相結構之實驗結果(XRD) 110 4-2-5 硬度試驗之實驗結果 113 4-3 TiZrHfNiCu高熵形狀記憶合金中Zr與Hf元素互換之影響 116 4-3-1 相變態溫度差異 116 4-3-2 顯微結構與析出現象差異 117 4-3-3 調整Zr與Hf比例對於合金設計策略之影響 117 第五章 結論 118 參考文獻 120 | - |
dc.language.iso | zh_TW | - |
dc.title | Ti30Zr15Hf5Ni35Cu15與Ti30Zr5Hf15Ni35Cu15高熵形狀記憶合金中Zr與Hf元素換置對於顯微結構與相變態之影響 | zh_TW |
dc.title | Effects of Element Substitution of Zr and Hf on Microstructure and Phase Transformation of Ti30Zr15Hf5Ni35Cu15 and Ti30Zr5Hf15Ni35Cu15 High Entropy Shape Memory Alloys | en |
dc.type | Thesis | - |
dc.date.schoolyear | 111-2 | - |
dc.description.degree | 碩士 | - |
dc.contributor.oralexamcommittee | 吳錫侃;林新智 | zh_TW |
dc.contributor.oralexamcommittee | Shyi-Kaan Wu;Hsin-Chih Lin | en |
dc.subject.keyword | 高熵合金,形狀記憶合金,時效處理,麻田散體相變態,析出物, | zh_TW |
dc.subject.keyword | high-entropy alloy,shape memory alloy,aging treatment,phase transformation,precipitates, | en |
dc.relation.page | 127 | - |
dc.identifier.doi | 10.6342/NTU202303132 | - |
dc.rights.note | 同意授權(限校園內公開) | - |
dc.date.accepted | 2023-08-10 | - |
dc.contributor.author-college | 工學院 | - |
dc.contributor.author-dept | 機械工程學系 | - |
顯示於系所單位: | 機械工程學系 |
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