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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 吳錫侃 | |
dc.contributor.author | Chen Chien | en |
dc.contributor.author | 簡甄 | zh_TW |
dc.date.accessioned | 2021-06-16T23:32:53Z | - |
dc.date.available | 2017-07-30 | |
dc.date.copyright | 2012-07-30 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-07-27 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65252 | - |
dc.description.abstract | 本研究針對Ti49Ni51 形狀記憶合金(SMA)之相變態、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固溶處理後之硬度值約為303HV。研究結果發現,一階段250℃時效者在25小時可達374HV之最大硬度。一階段時效於250℃、300℃及350℃等溫度,主要為B2↔R變態;而時效於400℃、450℃及500℃時,R相及B19’變態都非常明顯,由DSC結果可知上述之B2→R變態的RS溫度與反應熱都以300℃時效為最大。在300℃時效50小時者(硬度360HV)在SME及PE試驗中,其應力大於固溶處理者,殘留應變也較少,這是因為析出物強化基地,使塑性變形較不易產生所造成的。在二階段時效者中,其最大硬度值可達348Hv,雖然不及一階段時效者,但其SME之性能達100%,而在制振能的研究方面,發現二階段時效者相變態時之tanδ值相當高,可達0.073,僅次於固溶處理的試片,表示其比一階段時效者擁有良好的制振能。本研究之Ti49Ni51 SMA與Ti49.3Ni50.7者相比較,不論做一階段或兩階段時效者,發現Ni含量的增加對其SME及PE性能之改善是有顯著的效益,此因鎳含量提高,固溶強化及析出硬化的效果也增強。 | zh_TW |
dc.description.abstract | In this study, the property improvement of shape memory effect (SME) and pseudoelasticity (PE) exhibited in Ni-rich Ti49Ni51 shape memory alloy (SMA) solid-soluted(SS) and aged at 250℃~500℃ for various time is investigated. The hardness of specimen at 900℃x 1 hr SS and water quenched is 303HV. Among all aged specimens, the maximum hardness is 374 HV for specimen aged at 250℃x25 hrs. From DSC tests, B2↔R transformation mainly appears in specimens aged at 250℃~350℃, but both B2↔R and R↔B19’/B2↔B19’ transformations occur in specimens aged at 400℃~500℃. The Rs temperature and ∆HR value of B2↔R transformation reach their maxima for specimens aged at 300℃. In the early aging, the curve of the specimen hardness at room temperature v.s. aging time has the 1st maximum, the minimum and the 2nd maximum , in which the 2nd maximum is also the highest hardness possessed in aged alloy. From DSC results and TEM observations, the formation of R phase and nano-precipitates is closely related to the hardness maximum and minimum exhibited in specimens aged at 250℃~400℃. The specimens with two step aging have 100% SME and higher damping capacity even though their the maximum hardness is 348HV. The tensile tests for specimens aged at 300℃x50 hrs (hardness 360HV) and at 250℃x5 hrs+400℃x1 hr (hardness 341HV) indicate their SME and PE properties are better than those of Ti49.3Ni50.7 due to the former has higher SS strengthening and precipitation hardening. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T23:32:53Z (GMT). No. of bitstreams: 1 ntu-101-R99527001-1.pdf: 13998377 bytes, checksum: 7f43fe702e834d3bf8022dcb3981ba30 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | 致謝 i
摘要 vii Abstract ix 目錄 xi 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 2.1.1熱彈型麻田散體相變態 3 2.1.2形狀記憶效應之機制 5 2.1.3超彈性之機制 6 2.2 TiNi形狀記憶合金之結晶結構 7 2.3 富鎳TiNi形狀記憶合金 9 2.3.1 時效處理與多階相變態 9 2.3.2 TiNi形狀記憶合金之拉伸力學行為 13 2.4 TiNi形狀記憶合金之超彈性應力應變循環 14 2.4.1 超彈性應力應變循環對超彈性之影響 14 2.4.2 熱機處理對應力應變循環之影響 15 2.4.3 超彈性之能量儲存與消耗 16 2.5 TiNi合金之制振能特性 17 第三章 實驗步驟 45 3.1 Ti49Ni51試片準備 45 3.2 熱機處理 46 3.2.1 一階段時效 46 3.2.2 兩階段時效 46 3.3 DSC(差分掃描熱分析儀)量測 47 3.4 微硬度(Mircovickers)量測 47 3.5 拉伸試驗 48 3.6 DMA(動態機械分析儀)量測 49 3.7 TEM(穿透式電子顯微鏡)觀測 50 第四章 一階段時效對Ti49Ni51形狀記憶合金變態特性及記憶性質的影響 61 4.1 DSC結果與討論 61 4.1.1 250℃時效之DSC結果 61 4.1.2 300℃時效之DSC結果 62 4.1.3 350℃時效之DSC結果 62 4.1.4 400℃時效之DSC結果 62 4.1.5 450℃時效之DSC結果 63 4.1.6 500℃時效之DSC結果 63 4.1.7 DSC結果之討論 63 4.2 微硬度結果與討論 64 4.2.1 250℃時效之微硬度結果 65 4.2.2 300℃時效之微硬度結果 65 4.2.3 350℃時效之微硬度結果 66 4.2.4 400℃時效之微硬度結果 66 4.2.5 450℃時效之微硬度結果 66 4.2.6 500℃時效之微硬度結果 67 4.2.7 微硬度結果之討論 67 4.3 形狀記憶效應之結果與討論 69 4.4 超彈性之結果與討論 71 4.5 應力應變循環結果 73 4.6 DMA結果與討論 74 4.6.1 固溶處理之DMA結果 74 4.6.2 250℃時效之DMA結果 75 4.6.2 300℃時效之DMA結果 76 4.7 穿透式電子顯微鏡(TEM)之結果與討論 76 4.8 總結 78 第五章 兩階段時效對Ti49Ni51形狀記憶合金變態特性及記憶性質的影響 115 5.1 DSC結果與討論 115 5.1.1 250℃時效1hr之DSC結果 115 5.1.2 250℃時效5hrs之DSC結果 116 5.1.3 250℃時效25hrs之DSC結果 117 5.1.4 250℃時效50hrs之DSC結果 117 5.1.5 DSC結果之討論 118 5.2 微硬度結果與討論 119 5.2.1 250℃時效1hr及5hrs後經300℃不同時間時效之硬度結果 119 5.2.2 250℃時效25hr及50hrs後經300℃不同時間時效之硬度結果 120 5.2.3 250℃時效1hr及5hrs後經400℃不同時間時效之硬度結果 120 5.2.4 250℃時效25hrs及50hrs後經400℃不同時間時效之硬度結果 121 5.2.5 微硬度結果之討論 122 5.3 形狀記憶效應之結果與討論 122 5.4 超彈性之結果與討論 124 5.5 應力應變循環結果 126 5.6 DMA結果與討論 127 5.6.1 300℃兩階段時效之DMA結果 127 5.6.2 400℃兩階段時效之DMA結果 128 5.7 總結 129 第六章 結論 149 參考文獻 151 | |
dc.language.iso | zh-TW | |
dc.title | 富鎳Ti49Ni51形狀記憶合金時效後之相變態與性能最佳化之研究 | zh_TW |
dc.title | Transformation Characteristics and Properties Optimization of the Aged Ni-rich Ti49Ni51 Shape Memory Alloy | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
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,析出硬化,相變態,形狀記憶效應,超彈性, | zh_TW |
dc.subject.keyword | Ni-rich TiNi shape memory alloy,Aging,Precipitation hardening,Phase transformation,Shape memory effect,Pseudoelasticity, | en |
dc.relation.page | 154 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-07-27 | |
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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