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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳志軒(Chih-Hsuan Chen) | |
| dc.contributor.author | Jia-Jyun Shen | en |
| dc.contributor.author | 沈佳駿 | zh_TW |
| dc.date.accessioned | 2021-06-17T07:14:58Z | - |
| dc.date.available | 2024-07-31 | |
| dc.date.copyright | 2019-07-31 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-07-15 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73040 | - |
| dc.description.abstract | 本研究針對Ti49.6Ni50.4 棒材、Ti48.9Ni51.1 及 Ti50Ni48Fe2 形狀記憶合金塊材進行研究，探討熱循環及應力循環對於形狀記憶合金之變態溫度與彈熱效應的影響，以及不同操作溫度下之彈熱效應。經過時效處理之Ti49.6Ni50.4_275℃×125 hr與TiNi51.1_400 ℃×50 hr試片具有最良好的熱循環、應力循環穩定性以及彈熱效應性能，是因為在時效處理時產生之Ti3Ni4析出物，具有析出強化的效果，能夠有效阻擋循環時所產生之差排，提高材料之循環穩定性。並使Ti49.6Ni50.4_275℃×125 hr與TiNi51.1_400 ℃×50 hr試片於應力循環的過程中保持較高之溫度變化量，不易因循環次數增加而下降，顯示經析出硬化後，可擁有較佳之超彈性性能，並提供較高之溫度變化量。然而，由熱循環與應力循環之結果中可以發現，TiNi基形狀記憶合金經時效處理產生Ti3Ni4析出物後，雖然可有效提高其熱循環穩定性，並於超彈性加壓時減少差排生成，提高應力循環之穩定性，但於應力循環的過程中仍能觀察到相變態溫度有大幅度的改變，顯示析出硬化雖可使材料於單純熱循環下有良好的穩定效果，但對於應力循環之抵抗力較不足夠，表示應力對於形狀記憶合金變態行為的劣化影響，大於單純之熱循環之影響。不同溫度下之彈熱效應性能同樣以經時效處理之Ti49.6Ni50.4_275℃×125 hr與TiNi51.1_400 ℃×50 hr試片最佳，於 -40 ℃至150 ℃之溫度範圍內具有良好之彈熱效應表現，最高可達10 ℃~12 ℃。此外可以利用中間相R相之變態，擴展可產生彈熱效應之溫度範圍，即使溫度低於Rf變態溫度，仍可利用R↔B19’之間之相變態提供溫度變化，顯示導入B2↔R↔B19’之二階相變態可有效擴展彈熱效應之使用溫度範圍。透過數位影像關係法與紅外線之影像分析，可以有效地觀察出TiNi基形狀記憶合金於超彈性變態時之相變態趨勢、應力場分布以及溫度變化量分布，可以發現所有試片皆為均勻之麻田散體相變態。 | zh_TW |
| dc.description.abstract | In this study, the effects of thermal/stress cycles on transformation temperature, the effect of stress cycles on elastocaloric effect and the elastocaloric effect at different operating temperatures in Ti49.6Ni50.4 bar, Ti48.9Ni51.1, and Ti50Ni48Fe2 shape memory alloy blocks were investigated. The Ti49.6Ni50.4_275℃×125 hr and TiNi51.1_400 ℃×50 hr aged specimens exhibited the best thermal/stress cycles stability and elastocaloric effect performance, because of the strengthing effect of Ti3Ni4 precipitations formed during aging treatment. The precipitates could effectively hinder the dislocation movement during thermal/stress cycles and improved the functional stability of the material. The Ti49.6Ni50.4_275℃×125 hr and TiNi51.1_400 ℃×50 hr aged specimens maintained a high-temperature change during the stress cycles, indicating that they could contribute better superelasticity after precipitation hardening. However, it is noted from the results of thermal cycles and stress cycles that, although precipitation hardening could effectively improve the thermal cycles stability of TiNi-base shape memory alloys, the phase transition temperatures obviously shifted during the stress cycles. This features indicated that the precipitation hardening could improve the functional stability during thermal cycling but was less effective to resist dislocation motion during stress cycling. As a consequence, the effect of stress on the deterioration of the transformation behavior of shape memory alloy was found greater than the effect of thermal cycling. The Ti49.6Ni50.4_275℃×125 hr and TiNi51.1_400 ℃×50 hr aged specimens also showed better elastocaloric performance. At the temperature range of -40 °C to 150 °C, these two samples showed higher temperature change of cooling during unloading than the other specimens, the temperature change up to 10 ℃~12 ℃. In addition, it was found that the operating temperature range could be expanded by introducing R phase transformation, even if the operating temperature was lower than the Rf, the phase transformation between R↔B19' could be utilized to provide a temperature change, indicating that the two-stage phase transition of B2↔R↔B19' can effectively extend the operating temperature range of the elastocaloric effect. In this study, by utilizing digital image correlation(DIC) and infrared image analyses, the strain field distribution and temperature distribution of TiNi-based shape memory alloy superelastic can be directly observed and measured, and all specimens ware found to undergo uniform phase transformation. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T07:14:58Z (GMT). No. of bitstreams: 1 ntu-108-R06522732-1.pdf: 19612562 bytes, checksum: 4b054a5097171fb1d9586c25281b513f (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | 摘要...i
Abstract...iii 目錄...v 第一章 前言...1 第二章 文獻探討...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, SME)之機制...6 2-2-3超/擬彈性(Superelasticity, PE)...8 2-3 TiNi基形狀記憶合金...10 2-4熱循環與應力應變循環...11 2-4-1熱循環對形狀記憶效應之影響...11 2-4-2應力應變循環對超彈性之影響...12 2-4-3熱機處理對應力應變循環的影響...13 2-5彈熱效應簡介...14 2-5-1理論溫度變化量...15 2-5-2應變速率及應變量之影響...16 2-5-3溫度對彈熱效應之影響...17 2-5-4疲勞強度之於彈熱效應材料...17 第三章 實驗方法...39 3-1合金配置與熔煉...39 3-2 DSC量測...40 3-3熱循環...41 3-4時效處理...45 3-5 EBSD晶體方位分析...45 3-6 EPMA成分分析...45 3-7壓縮超彈性實驗...45 3-8應力循環測試...46 3-9溫度變化量量測...46 3-10不同溫度下之彈熱效應...47 第四章 合金之熱循環與應力循環...55 4-1 DSC量測結果...55 4-1-1 TiNi51.1塊材時效之DSC結果...55 4-1-2 Ti49.6Ni50.4棒材時效之DSC結果...57 4-1-3 Ti50Ni48Fe2塊材時效之DSC結果...58 4-2 EBSD晶體方位分析結果...58 4-3熱循環穩定性結果...59 4-3-1 TiNi51.1塊材之熱循環結果...59 4-3-2 Ti49.6Ni50.4棒材之熱循環結果...61 4-3-3 Ti50Ni48Fe2塊材之熱循環結果...62 4-4應力循環對變態溫度之影響...63 4-4-1 Ti49.6Ni50.4棒材之應力循環結果...63 4-4-2 TiNi51.1_400℃×50 hr塊材之應力循環結果...65 4-4-3 Ti50Ni48Fe2塊材之應力循環結果...65 4-5熱循環與應力循環...65 4-6應力循環對彈熱效應之影響...66 4-6-1 Ti49.6Ni50.4_as recevied之應力循環對彈熱效應之影響...67 4-6-2 Ti49.6Ni50.4_275℃×125 hr之應力循環對彈熱效應之影響...69 4-6-3 Ti49.6Ni50.4_300℃×1 hr之應力循環對彈熱效應之影響...69 4-6-4 TiNi51.1_400℃×50 hr之應力循環對彈熱效應之影響...70 4-6-5 Ti50Ni48Fe2_900℃×1 hr之應力循環對彈熱效應之影響...71 4-6-6應力循環對彈熱效應之影響結果討論...72 第五章 各合金於不同溫度下之彈熱效應...111 5-1 Ti49.6Ni50.4_as recevied試片於不同溫度下之彈熱效應...111 5-2 Ti49.6Ni50.4_275℃×125 hr試片於不同溫度下之彈熱效應...113 5-3 Ti49.6Ni50.4_300℃×1 hr試片於不同溫度下之彈熱效應...113 5-4 TiNi51.1_400℃×50 hr試片於不同溫度下之彈熱效應...114 5-5 Ti50Ni48Fe2_900℃×1 hr試片於不同溫度下之彈熱效應...115 5-6各個試片於不同溫度下之彈熱效應比較...116 5-7不同溫度下固定應變之彈熱效應...118 5-7-1 DIC與紅外線影像分析...120 5-8各個試片之紅外線影像分析...121 第六章 結論...149 參考文獻...151 | |
| dc.language.iso | zh-TW | |
| dc.subject | 熱循環 | zh_TW |
| dc.subject | 時效析出 | zh_TW |
| dc.subject | 彈熱效應 | zh_TW |
| dc.subject | 應力循環 | zh_TW |
| dc.subject | TiNi基形狀記憶合金 | zh_TW |
| dc.subject | thermal cycle | en |
| dc.subject | stress cycle | en |
| dc.subject | elastocaloric effect | en |
| dc.subject | TiNi-based shape memory alloy | en |
| dc.subject | aging treatment | en |
| dc.title | "Ti49.6Ni50.4棒材,Ti48.9Ni51.1及Ti50Ni48Fe2形狀記憶合金塊材之彈熱效應研究" | zh_TW |
| dc.title | Research on The Elastocaloric Effect of Ti49.6Ni50.4 Bar, Ti48.9Ni51.1 And Ti50Ni48Fe2 Shape Memory Alloys | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 107-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 吳錫侃,林新智 | |
| dc.subject.keyword | TiNi基形狀記憶合金,熱循環,應力循環,彈熱效應,時效析出, | zh_TW |
| dc.subject.keyword | TiNi-based shape memory alloy,thermal cycle,stress cycle,elastocaloric effect,aging treatment, | en |
| dc.relation.page | 157 | |
| dc.identifier.doi | 10.6342/NTU201901505 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2019-07-16 | |
| 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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