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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳志軒(Chih-Hsuan Chen) | |
| dc.contributor.author | Cheng-Tien Wu | en |
| dc.contributor.author | 吳政典 | zh_TW |
| dc.date.accessioned | 2022-11-23T09:04:11Z | - |
| dc.date.available | 2021-11-08 | |
| dc.date.available | 2022-11-23T09:04:11Z | - |
| dc.date.copyright | 2021-11-08 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-09-20 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79577 | - |
| dc.description.abstract | "本文研究Ti49Ni41Cu10形狀記憶合金塊材於固溶處理後進行時效處理，並針對其相變態行為、顯微結構、壓縮超彈性及彈熱效應等性質加以探討。於400℃及500℃時效處理時，基地析出片狀Ti(Ni,Cu)2析出物，其周圍之應力場可為B19麻田散體相的異質成核點，使原先基地較低溫度之(B2↔B19)2相變態逐漸轉變為較高溫度之(B2↔B19)1相變態。經400℃時效處理168小時試片具有最優異的應力循環穩定性以及彈熱效應性能，因時效處理產生之Ti(Ni,Cu)2析出物具析出強化效果，於應力循環訓練過程中可有效阻擋差排滑移，使其相變態行為、超彈性性能保持穩定，且疲勞抗性佳。透過數位影像相關係數法與紅外線之影像分析，於壓縮實驗過程觀察應變場以及溫度變化分布，可發現試片整體之相變態十分均勻，經1000次訓練後絕熱降溫變化量僅下降5.5%，保有-17.0 K之溫度變化量，並且於60℃操作溫度下材料效能係數高達26.0，與普遍TiNi二元形狀記憶合金相比更為優秀。經500時效處理24小時試片因尺寸較大的Ti(Ni,Cu)2析出物長大佔據基地，使其擁有(B2↔B19)1 以及(B2↔B19)2之多階段相變態，雖因析出物成長失去與基地之整合性，在應力循環訓練過程中抵抗塑性變形能力不如400℃時效處理168小時者，但由於應力循環訓練後材料內部導入差排，使超彈性性質穩定，且相變態溫度範圍變寬，低溫之(B2↔B19)2相變態可提供彈熱效應溫度變化，進一步擴展彈熱效應使用範圍。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-23T09:04:11Z (GMT). No. of bitstreams: 1 U0001-1609202114010400.pdf: 14231788 bytes, checksum: 531dbacb9daa3a4cbe87c6b3b62d5f0f (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | 摘要 v Abstract vi 圖目錄 xi 表目錄 xviii 第一章 前言 1 第二章 文獻回顧 2 2-1 形狀記憶合金簡介 2 2-2 形狀記憶合金之相變態 3 2-3 形狀記憶效應之機制 5 2-4 超彈性之機制 6 2-5 TiNi(Cu)形狀記憶合金之晶體結構 8 2-6 TiNi(Cu)形狀記憶合金之麻田散體相變態 9 2-7 TiNi形狀記憶合金之多階段相變態 10 2-7-1 析出物之影響 10 2-7-2 不同晶粒大小影響 11 2-8 應力循環對形狀記憶合金之影響 12 2-8-1 應力循環對於超彈性之影響 12 2-8-2 熱機處理對應力循環之影響 12 2-9 彈熱效應簡介 13 2-9-1 理論計算彈熱效應之溫度變化 14 2-9-2 應變速率及應變量對於彈熱效應影響 15 2-9-3 環境操作溫度對彈熱效應之影響 16 2-9-4 疲勞強度之於彈熱效應材料 16 第三章 實驗方法 40 3-1 合金配置與熔煉 40 3-2 固溶處理 41 3-3 時效處理 42 3-4 DSC量測 42 3-5 EBSD晶體方位分析 43 3-6 光學顯微鏡(OM)及掃描式電子顯微鏡(SEM)觀察 43 3-7 穿透式電子顯微鏡(TEM)微結構觀察 43 3-8 XRD分析 44 3-9 顯微維克式硬度測試 44 3-10 應力循環測試 44 3-11 試片之超彈性訓練與彈熱效應 44 3-12 不同操作溫度下之彈熱性能測試 45 第四章 時效處理對於相變態行為之影響 52 4-1 Ti49Ni41Cu10形狀記憶合金之固溶處理 52 4-2 EBSD晶體方位分析結果 53 4-3 時效處理對於相變態性質之影響 54 4-3-1 於300 ℃時效處理之DSC結果 54 4-3-2 於400 ℃時效處理之DSC結果 55 4-3-3 於500 ℃時效處理之DSC結果 55 4-3-4 時效處理對於顯微結構之影響 56 4-4 XRD實驗結果 58 4-5 時效處理對硬度之影響 59 4-6 本章結語 60 第五章 合金應力循環與彈熱效應 77 5-1 應力循環訓練結果 77 5-1-1 於400 ℃時效48hr試片進行訓練之結果 77 5-1-2 於400 ℃時效168hr試片進行訓練之結果 79 5-1-3 於500 ℃時效24hr試片進行訓練之結果 80 5-1-4 於應力循環訓練時之彈熱效應結果討論 82 5-1-5 於應力循環訓練時之應變分布變化及紅外線影像 84 5-2 不同操作溫度下於固定應力測試之彈熱效應 86 5-2-1 於400℃時效48hr試片在不同操作溫度下之彈熱效應 86 5-2-2 於400℃時效168hr試片在不同操作溫度下之彈熱效應 87 5-2-3 於500℃時效24hr試片在不同操作溫度下之彈熱效應 88 5-2-4 固定應力下於不同操作溫度之彈熱效應比較 88 5-3 不同操作溫度下於固定應變量測試之彈熱效應 89 第六章 結論 123 參考文獻 126 | |
| dc.language.iso | zh-TW | |
| dc.title | 時效處理對Ti49Ni41Cu10形狀記憶合金塊材之超彈性與彈熱效應研究 | zh_TW |
| dc.title | Research on the Pseudoelasticity and Elastocaloric Effect of Aged Ti49Ni41Cu10 Shape Memory Alloy | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳俊杉(Hsin-Tsai Liu),陳建彰(Chih-Yang Tseng) | |
| dc.subject.keyword | TiNiCu形狀記憶合金,時效處理,多階段相變態,應力循環,彈熱效應, | zh_TW |
| dc.subject.keyword | TiNiCu SMA,aging treatment,multi-stage transformation,stress cycling,elastocaloric effect, | en |
| dc.relation.page | 137 | |
| dc.identifier.doi | 10.6342/NTU202103208 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2021-09-22 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| 顯示於系所單位： | 機械工程學系 | |
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