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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳錫侃 | |
| dc.contributor.author | Kuo-Hsiang Chang | en |
| dc.contributor.author | 張國祥 | zh_TW |
| dc.date.accessioned | 2021-06-08T05:10:05Z | - |
| dc.date.copyright | 2011-07-26 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-07-18 | |
| dc.identifier.citation | [1] L. C. Chang and T. A. Read, Trans. AIME., 189 (1951) 47.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/23785 | - |
| dc.description.abstract | 本研究針對Ti49.3Ni50.7 形狀記憶合金(SMA)之形狀記憶效應(SME)、超彈性(PE)與超彈性應力應變循環等性質之提升作一系列的探討。900℃×1hr固溶處理後之Ti49.3Ni50.7 SMA若未經任何時效處理強化者，其硬度值較低，且PE性質由於SIM逆變態較少而使得殘留應變較多，SME之可回復應變較小，其超彈性應力應變循環性質也較差。固溶處理後之Ti49.3Ni50.7 SMA經時效後會有Ti3Ni4之析出硬化，本研究將時效時溫度保持一致者稱為一階段時效，而先在低溫時效後再高溫時效者稱為二階段時效。研究結果發現，一階段300℃時效者在50小時可達347HV之最大硬度，此硬度值也較其他一階段時效者大，且具有良好的PE、SME與超彈性應力應變循環性能。在二階段時效者中，先250℃時效再300℃時效者，其最大硬度值可達333Hv，雖然不及一階段300℃時效者，但卻能有效提升σM及σR值，使其儲存能量較大，儲能效率也是最高的，因此有優異的PE性能，而其SME之性能也幾乎達100%。在制振能的研究方面，發現二階段時效者若其高溫時效為300℃者相變態時之tanδ值相當高並有相當明顯的storage modulus極低值，顯示其擁有良好的制振能。在二階段時效下若其高溫時效為300℃或400℃並使時效硬度達到最大值時，400℃時效者之PE性質的σM及σR值都較300℃者來的低，儲存能量及儲能效率也較差。研究結果顯示，一階段時效或兩階段時效並使時效硬度達到最大值時，其SME表現差不多，應變量幾乎都可完全回復；雖然一階段時效者最高硬度較大，也可在較短的時效時間下達到最大硬度，但兩階段時效者在最高硬度下其PE的各項特性上都較一階段時效者來的高，且兩階段時效者也可提升相變態時之制振能，顯示兩階段時效者較有利於強化PE、SME與超彈性應力應變循環等性能。 | zh_TW |
| dc.description.abstract | In this study, the optimal properties of shape memory effect (SME), pseudoelasticity (PE), damping capacity (DC) and PE stress-strain (σ-ε) cycling of Ti49.3Ni50.7 shape memory alloy (SMA) are investigated. The solution-treated (900℃×1h) Ti49.3Ni50.7 SMA without aging has the worst properties, as compared with the aged one. One-step and two step aging treatments are conducted in the temperature range between 250℃ and 450℃ for different aging time and Ti3Ni4 precipitates are formed and the hardness increases due to precipitation hardening. Experimental results show that one-step aging heat-treated at 300℃×50h would attain the maximum specimen’s hardness 347Hv and have rather good PE, SME and PE σ-ε cycling properties. In two-step aging, specimen pre-aged at 250℃×1h and then aged at 300℃×50h can obtain the maximum hardness 333Hv. Though the maximum hardness obtained by two-step aging is less than that by one-step aging, two-step aged specimen can effectively enhance σM and σR values to increase the stored energy during PE σ-ε cycling and thus exhibit excellent PE performance. The DC tests indicate that the two-step aged specimen has relatively high tanδ and conspicuous minimum storage modulus during martensitic transformation. Both one-step and two-step aged specimens which have maximum hardness are almost fully recovered strain in SME tests. Besides, the one-step aged specimen can attain higher hardness value with less heat-treating time, but the overall SME/PE properties of two-step aged one are better. This infers that two-step aging is benefit to improve the properties of PE, SME, PEσ-ε cycling and damping capacity. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T05:10:05Z (GMT). No. of bitstreams: 1 ntu-100-R98527005-1.pdf: 9396973 bytes, checksum: d988d80456c6b8338a042de600a0c3ed (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 致謝 i
摘要 iii Abstract v 目錄 vii 第一章 前言 1 第二章 文獻回顧 3 2-1 形狀記憶合金(SMAs)簡介 3 2-1-1 熱彈性型麻田散體相變態 4 2-1-2 形狀記憶效應(shape memory effect, SME)之機制 5 2-1-3 超彈性/擬彈性(Superelasticity/Pseudoelasticity, PE) 7 2-2 R相變態及TiNi形狀記憶合金的結構 9 2-3 富鎳TiNi形狀記憶合金之時效處理效應 10 2-4 富鎳TiNi形狀記憶合金之多階相變態行為 12 2-5 超彈性應力應變循環 15 2-5-1 超彈性應力應變循環對超彈性的影響 15 2-5-2 熱機處理對應力應變的影響 16 2-5-3 拉伸下超彈性能量儲存與消耗 17 2-6 鈦鎳形狀記憶合金的制振能特性 18 第三章 實驗步驟 35 3-1 Ti49.3Ni50.7試片準備 35 3-2 熱機處理 36 3-2-1 Ti49.3Ni50.7形狀記憶合金一階段時效 36 3-2-2 Ti49.3Ni50.7形狀記憶合金兩階段時效 37 3-3 DSC熱分析儀變態點量測 37 3-4 微硬度測試 38 3-5 拉伸試驗 38 3-6動態機械分析儀(Dynamic Mechanical Analyzer, DMA)量測 39 第四章 51 一階段時效對Ti49.3Ni50.7形狀記憶合金變態特性及記憶性質的影響 51 4-1 DSC 結果與討論 51 4-1-1 250℃時效後之DSC 結果 52 4-1-2 275℃時效後之DSC 結果 52 4-1-3300℃時效後之DSC 結果 53 4-1-4 350℃時效後之DSC 結果 55 4-1-5 400℃時效時效後之DSC 結果 55 4-1-6 425℃及450℃時效後之DSC 結果 56 4-2 硬度測試 57 4-2-1 300℃時效之硬度結果 57 4-2-2 400℃時效之硬度結果 58 4-2-3 250℃及275℃時效之硬度結果 58 4-2-4 350℃、425℃及450℃時效之硬度結果 59 4-3 DMA實驗結果與討論 60 4-3-1 固溶處理後Ti49.3Ni50.7 之DMA結果 60 4-3-2 300℃時效後之DMA結果 61 4-4 形狀記憶效應實驗結果與討論 62 4-5超彈性實驗結果與討論 64 4-6 超彈性應力應變循環實驗結果與討論 65 第五章 85 兩階段時效對Ti49.3Ni50.7形狀記憶合金變態特性及記憶性質的影響 85 5-1 DSC 結果與討論 85 5-1-1 250℃時效1hr加上300℃及400℃不同時間時效之DSC結果 86 5-1-2 250℃時效5hr加上300℃及400℃不同時間時效之DSC結果 87 5-1-3 250℃時效25hr加上300℃及400℃不同時間時效之DSC結果 88 5-1-4 250℃時效50hr加上300℃及400℃不同時間時效之DSC結果 88 5-2 硬度測試之結果 89 5-2-1 250℃時效1hr及5hr加上300℃不同時間時效之硬度結果 89 5-2-2 250℃時效25hr及50hr加上300℃不同時間時效之硬度結果 90 5-2-3 250℃時效1hr及5hr加上400℃不同時間時效之硬度結果 91 5-2-4 250℃時效25hr及50hr加上400℃不同時間時效之硬度結果 92 5-3 DMA實驗結果與討論 93 5-3-1 250℃時效1hr加上300℃時效50hr之DMA實驗結果 93 5-3-2 250℃時效5hr加上300℃時效50hr之DMA實驗結果 94 5-3-3 250℃時效5hr加上400℃時效1hr之DMA實驗結果 94 5-4 形狀記憶效應實驗結果與討論 95 5-4-1 形狀記憶效應之實驗結果 95 5-4-2 形狀記憶效應之討論 96 5-5 超彈性實驗結果與討論 97 5-5-1 PE之結果與討論 98 5-6 超彈性拉伸應力應變循環之結果與討論 99 5-7 不同強化方式對於Ti49.3Ni50.7 SMAs性能提升之綜合討論 100 第六章 結論 121 參考文獻 125 | |
| dc.language.iso | zh-TW | |
| dc.title | 時效後Ti49.3Ni50.7形狀記憶合金變態特性及記憶性質之研究 | zh_TW |
| dc.title | Transformation Characteristics and Memory Properties of aged Ti49.3Ni50.7 Shape Memory Alloy | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林新智,胡塵滌,周棟勝,張世航 | |
| dc.subject.keyword | 富鎳TiNi形狀記憶合金,時效硬化,一階/二階時效,形狀記憶效應,超彈性,應力應變循環,制振能, | zh_TW |
| dc.subject.keyword | Ni-rich TiNi shape memory alloys,precipitate hardening,one-step and two step aging,shape memory effect,pseudoelasticity,damping capacity, | en |
| dc.relation.page | 129 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2011-07-18 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
| 顯示於系所單位： | 材料科學與工程學系 | |
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