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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72036完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳志軒 | |
| dc.contributor.author | Yue-Jin Chen | en |
| dc.contributor.author | 陳躍今 | zh_TW |
| dc.date.accessioned | 2021-06-17T06:20:12Z | - |
| dc.date.available | 2018-08-21 | |
| dc.date.copyright | 2018-08-21 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-08-20 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72036 | - |
| dc.description.abstract | 本研究針對Ti40Zr10Ni40Co5Cu5、Ti30Zr20Ni30Co10Cu10、Ti25Zr25(NiCoCu)50五元合金與TiZrHfNiCoCu、(TiZrHf)50Ni25Co10Cu15、(TiZrHf)Ni30.5Co5Cu15六元合金進行研究，探討高熵性質對形狀記憶合金相變態之影響。研究結果顯示六種合金皆無法形成單相固溶體，而是產生單一固溶體與析出物之混合相。影響相變態溫度的主因由加入Co與Hf、Zr的多寡決定，Co會抑制相變態溫度，而Zr、Hf則會提高相變態溫度，其中五元合金Ti40Zr10Ni40Co5Cu5、Ti30Zr20Ni30Co10Cu10、Ti25Zr25(NiCoCu)50及六元合金TiZrHfNiCoCu不產生相變態，而(TiZrHf)50Ni25Co10Cu15與(TiZrHf)Ni30.5Co5Cu15有B19’麻田散體相變態產生，(TiZrHf)50Ni25Co10Cu15爐冷相變態溫度峰值與逆變態溫度峰值分別為-24.0 °C、8.9 °C，固溶處理後相變態溫度峰值升高至-0.3°C、40.6°C，而(TiZrHf)Ni30.5Co5Cu15爐冷相變態溫度與逆變態溫度則為156.2 °C、200.3 °C。兩者熱循環後相變態溫度下降，主要原因為母相與麻田散體相匹配性不佳，在熱循環過程中導入差排所導致。(TiZrHf)50Ni25Co10Cu15¬¬在固溶處理後形狀記憶效應性能提升，可回復應變提高，不可回復應變降低，在650MPa下分別為4.78%、0.38%。(TiZrHf)Ni30.5Co5Cu15為高溫形狀記憶合金，經由時效後可調整變態溫度，500°C時效處理10小時之後之可回復應變為0.35%、可回復應變比為74.47 %，比600°C 時效1小時的可回復應變0.17%、可回復應變比54.84 %好，形狀記憶效應較好。研究結果顯示，(TiZrHf)50Ni25Co10Cu15比富鎳之(TiZrHf)Ni30.5Co5Cu15有更佳的形狀記憶效應。 | zh_TW |
| dc.description.abstract | The influence of high entropy effect on Ti40Zr10Ni40Co5Cu5, Ti30Zr20Ni30Co10Cu10, Ti25Zr25(NiCoCu)50, TiZrHfNiCoCu, (TiZrHf)50Ni25Co10Cu15 and (Ti16.5Zr16.5Hf16.5)Ni30.5Co5Cu15 alloys is discussed in this study. All of the alloys form the mixing phases of B2 solid solution and Ti2Ni-like precipitate rather than a single solid solution. The martensitic transformation temperature will decrease by adding cobalt and increase by adding zirconium and hafnium. Martensitic transformation can be observed only in (TiZrHf)50Ni25Co10Cu15 and (Ti16.5Zr16.5Hf16.5)Ni30.5Co5Cu15. The forward and the reverse transformation peaks of furnace-cooled (TiZrHf)50Ni25Co10Cu15 alloy are at -24.0 °C and 8.9 °C, and increase to -0.3 °C and 40.6 °C after solid-solution treatment, respectively. The forward and reverse transformation peaks of furnace-cooled (Ti16.5Zr16.5Hf16.5)Ni30.5Co5Cu15 are 156.2 °C and 200.3 °C. Due to the poor compatibility of austenite and martensite, dislocations are introduced in (TiZrHf)50Ni25Co10Cu15 and (Ti16.5Zr16.5Hf16.5)Ni30.5Co5Cu15 alloys during the thermal cycle, and thus their martensitic transformation temperatures decrease as the number of martensitic transformation increases. The shape memory effect of (TiZrHf)50Ni25Co10Cu15 is improved after solution treatment. Its reversible strain reaches 4.78% and irreversible strain is smaller than 0.38% under 650MPa. (Ti16.5Zr16.5Hf16.5)Ni30.5Co5Cu15¬ is a high temperature shape memory alloy and its transformation temperature can be adjusted by aging treatment. After 500 °C aging for 10 hours, the reversible strain and the reversible strain ratio are 0.35% and 74.47%, respectively, better than 0.17% and 54.84% after 600 °C aging for 1 hour. Finally, (TiZrHf)50Ni25Co10Cu15 has better shape memory effect than Ni-rich (Ti16.5Zr16.5Hf16.5)Ni30.5Co5Cu15¬ alloy. | en |
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| dc.description.tableofcontents | 目錄
第一章 前言 1 第二章 文獻探討 2 2-1 形狀記憶合金簡介 2 2-2 形狀記憶特性 2 2-2-1熱彈型麻田散體相變態 2 2-2-2形狀記憶效應 4 2-2-3擬彈性 6 2-3 TiNi基形狀記憶合金 7 2-4不同合金元素影響 8 2-5熱循環對合金之影響 10 2-6 高熵合金簡介 10 2-6-1高熵效應 11 2-6-2緩慢擴散 12 2-6-3晶格扭曲 12 2-6-4雞尾酒效應 13 2-7 高熵形狀記憶合金形成理論 13 第三章 實驗方法 29 3-1 合金配置與熔煉 30 3-2 DSC量測 31 3-3熱循環測試 31 3-4 DMA量測 32 3-4-1三點彎曲測試原理 32 3-5拉伸試驗 33 3-6 SEM觀察 33 3-7 XRD分析 34 3-8 EPMA量測 34 3-9 TEM觀察 34 3-10 壓縮試驗 34 3-11硬度量測 35 3-12奈米壓痕(Nanoindenter)試驗 35 第四章 無麻田散體相變態之合金 42 4-1 高熵性質 42 4-2 DSC 測量結果 42 4-3 顯微組織觀察結果(SEM) 43 4-4晶體結構測量結果(XRD) 43 4-5 硬度測量結果(Vickers Microhardness) 44 第五章 具麻田散體相變態之合金 63 5-1 (TiZrHf)50Ni25Co10Cu15合金之相變態行為 63 5-1-1 Co10合金相變態溫度與相變態行為之測量結果(DSC) 63 5-1-2 熱循環處理對Co10合金之影響 64 5-1-3 Co10合金顯微組織之觀察結果(SEM) 65 5-1-4 Co10 成分分布測量結果(EPMA) 65 5-1-5 Co10合金晶體結構測量結果(XRD) 65 5-1-6 Co10 合金微結構之觀察結果(TEM) 66 5-1-7 Co10合金硬度測量結果(Vickers microhardness) 66 5-1-8 Co10合金形狀記憶效應之測量結果(DMA、拉伸) 67 5-2 (TiZrHf)Ni30.5Co5Cu15合金之相變態行為 68 5-2-1 Co5合金相變態溫度與相變態行為之測量結果(DSC) 68 5-2-2 熱循環處理對Co5合金之影響 68 5-2-3 Co5合金顯微組織之觀察結果(SEM) 69 5-2-4 Co5成分分布測量結果(EPMA) 70 5-2-5 Co5合金晶體結構測量結果(XRD) 70 5-2-6 Co5合金之微結構之觀察結果(TEM) 71 5-2-7 Co5合金硬度測量結果(Vickers Microhardness、nanoindenter) 71 5-2-8 時效對Co5合金產生之影響 72 5-2-9 Co5合金形狀記憶效應之測量結果(DMA、拉伸) 73 5-3 綜合比較 74 5-3-1 高熵性質 74 5-3-2 成分對相變態之影響 74 5-3-3 晶格常數 75 第六章 結論 114 附錄 115 參考文獻 117 | |
| dc.language.iso | zh-TW | |
| dc.title | (TiZrHf)(NiCoCu)系列擬二元高熵形狀記憶合金之麻田散體相變態行為與機械性質之研究 | zh_TW |
| dc.title | Research on Martensitic Transformation Behaviors and Properties of Pseudobinary (TiZrHf)(NiCoCu)-based High Entropy Shape Memory Alloys | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 吳錫侃,鄭憶中 | |
| dc.subject.keyword | 形狀記憶合金,高熵合金,形狀記憶效應,麻田散體相變態,時效熱處理,析出物, | zh_TW |
| dc.subject.keyword | Shape memory alloys,High entropy alloys,Shape memory Effect,Martensitic transformation,Aging,Precipitate, | en |
| dc.relation.page | 124 | |
| dc.identifier.doi | 10.6342/NTU201803832 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-08-20 | |
| 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 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-107-1.pdf 目前未授權公開取用 | 16.4 MB | Adobe PDF |
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