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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/22818完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳錫侃(Shyi-Kaan Wu) | |
| dc.contributor.author | Yau-Ching Liau | en |
| dc.contributor.author | 廖姚晴 | zh_TW |
| dc.date.accessioned | 2021-06-08T04:29:24Z | - |
| dc.date.copyright | 2010-01-21 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-01-19 | |
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Funakudo, Shape Memroy alloys, Gordon and Breach Science Publishers, NY, (1987), 89. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/22818 | - |
| dc.description.abstract | 以粉末冶金(PM)製備富鈦TiNi形狀記憶合金，於900℃以下之溫度燒結時，因Kirkendall Effect於Ni粒附近留有≦5μm之孔洞，當在900℃持溫1小時後，因共晶反應使原本的Ti粒處形成大約20~50μm之孔洞，但Ti55.08at%-Ni者因有多量的Ti2Ni於高溫時成為液相，可將孔洞補平。PM Ti50at%-Ni於900℃以下燒結時，其變態溫度較同成份之VAR製備者高，且與PM Ti52at%-Ni和PM Ti55.08at%-Ni者相近，此應與其內均是富鈦TiNi B2相有關；當燒結溫度提升至1000℃以上時，PM Ti50at%-Ni的變態溫度則下降至比VAR者低，此應與TiNi B2相已由偏富Ti變為偏富Ni有關，且此時會固溶較多之C、O原子。在不同燒結流程的研究中，使用兩階段燒結法之Ti50at%-Ni的試片，相較於一階段燒結法，其密度可提升約10%，主因於900℃持溫2小時時，Ti和Ni間會先形成Ti2Ni、TiNi和TiNi3等中間相，因此再升溫至942℃時，其共晶反應不如一階段燒結者激烈。二階段燒結之Ti50at%-Ni其形狀回復率只有76%，較同成份VAR之90%小，應為PM試片中有許多孔洞之故。使用兩階段燒結法燒結之Ti52at%-Ni試片，相較於一階段燒結者，其密度可從76%提升至97%，其形狀回復率因有較多Ti2Ni相而為70%，但與同成份VAR者相近，但經5次之形狀回復測試後其回復率可達97%。PM Ti52at%-Ni的tanδ之峰值較同成分VAR者略大，顯示PM試片中的孔洞有助於吸收震動之能量。本文同時由Ti-Ni二元平衡圖，對富鈦TiNi形狀記憶合金之變態溫度常在出現M*≒60℃，A*≒100℃之現象提出解釋。 | zh_TW |
| dc.description.abstract | Martensitic transformation behaviors of Ti-rich TiNi shape memory alloys (SMAs) fabricated by powder metallurgy (PM) are investigated. When sintering at ＜900℃, PM SMAs have small pores(≦5μm) formed near Ni particles due to Kirkendall Effect, but sintering at 900℃ for 1 h, they have big pores(20~50μm) formed at the prior site of Ti particles due to eurtectic reaction. Ti55.08at%-Ni contains lots of Ti2Ni which becomes liquid phase at 984℃ and fills up the pore. As sintering at ＜900℃, the forward and reverse transformation peak temperatures (M* and A*) of PM Ti50at%-Ni are higher than those of VAR one, but similar to those of Ti52at%-Ni and Ti55.08at%
-Ni due to the formation of Ti-rich TiNi B2 phase. As sintering at ＞1000℃, M* and A* of PM Ti50at%-Ni are lower than those of VAR one due to the formation of Ni-rich TiNi B2 phase in which lots of carbon and oxygen atoms are dissolved simultaneously. Different sintering processes are also examined in this study. The density of Ti50at%-Ni sintered by 2-step process is 10% higher than that sintered by 1-step process. Because Ti2Ni, TiNi and TiNi3 are formed in Ti-rich PM SMAs during the holding time at 900℃, the eutectic reaction in 2-step process is not so violent as that in 1-step process. The shape recovery of PM Ti50at%-Ni is 76% which is lower than that of VAR one, 90%, due to the pores existed in PM alloy. Ti52at%-Ni alloy’s density sintered by 2-step process is 20% higher than that sintered by 1-step process, but its shape recovery (70%) is near to that of VAR one (72%) due to both have lots of Ti2Ni and the PM alloy has high density (92%). The damping capacity (tanδ) of PM Ti52at%-Ni is higher than that of VAR Ti52at%-Ni due to the pores in PM alloy can absorb the damping energy. In this study, PM Ti-rich TiNi SMAs exhibit M*≒60℃ and A*≒100℃ and this characteristic is explained from the viewpoint of Ti-Ni phase diagram. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T04:29:24Z (GMT). No. of bitstreams: 1 ntu-99-R96527067-1.pdf: 22978430 bytes, checksum: 96c604940241c78ad4b93b0452a8ce83 (MD5) Previous issue date: 2010 | 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 形狀記憶合金簡介 3 2-1-1 熱彈型麻田散體變態 4 2-1-2 形狀記憶效應 (SME) 6 2-1-3 擬彈性 (PE) 8 2-2 TiNi基形狀記憶合金 10 2-2-1 TiNi二元形狀記憶合金之各相與結晶構造 10 2-2-2 TiNi二元形狀記憶合金之力學特性 11 2-3 以粉末冶金方式製備TiNi形狀記憶合金 14 2-3-1 粉末冶金基本製程 14 2-3-2 以粉末冶金方式製備TiNi形狀記憶合金 16 2-3-2-1 傳統燒結 16 2-3-2-2 反應燒結(Reaction Sintering) 19 2-3-2-3 熱均壓(Hot Isostatic Pressing，HIP) 19 2-3-2-4 射出成形(Metal Injection Molding，MIM) 20 2-3-3 本研究的主題 20 第三章 實驗方法與步驟 39 3-1 實驗流程 39 3-2 粉末混合、壓胚 39 3-3 燒結 40 3-3-1 使用大氣爐燒結後淬火(第一部分實驗) 40 3-3-2 真空爐燒結(第二部分實驗) 40 3-4 DSC分析 41 3-5 顯微組織觀察 41 3-5-1 一般金相觀察 41 3-5-2 穿透式電子顯微鏡 42 3-6 XRD分析 42 3-7 密度測試 42 3-8 碳氧分析 43 3-9 形狀記憶效應測試 43 3-10 DMA分析 44 第四章 實驗結果 53 4-1 燒結過程分析與討論 53 4-1-1 DSC的結果與分析 53 4-1-2 顯微組織觀察與分析 56 4-1-2-1 OM觀察與分析 56 4-1-2-2 SEM觀察與分析 57 4-1-2-3 TEM觀察與分析 59 4-1-3 XRD分析與討論 60 4-1-4 綜合討論 62 4-2 不同燒結條件之影響 65 4-2-1 燒結曲線 65 4-2-2 密度之測量結果 65 4-2-3 燒結後合金中碳、氧含量之測量結果 67 4-2-4 DSC的結果與分析 68 4-2-5 顯微組織觀察與分析 69 4-2-6 形狀記憶效應 70 4-2-7 DMA的結果與分析 71 4-2-8 綜合討論 73 4-3 PM TiNi SMAs麻田散體變態溫度之討論 75 4-3-1 TiNi B2相在不同溫度下之飽和溶解度曲線的含Ni含量 75 4-3-2 TiNi B2相的Ni含量與Ms變態溫度之關係 75 4-3-3 不同之燒結溫度下PM TiNi合金之Ms(M*)溫度 76 4-3-4 不同燒結流程下PM TiNi SMAs之Ms(M*)溫度 77 第五章 結論 119 參考文獻 123 | |
| dc.language.iso | zh-TW | |
| dc.subject | TiNi形狀記憶合金 | zh_TW |
| dc.subject | 粉末冶金 | zh_TW |
| dc.subject | 燒結機制 | zh_TW |
| dc.subject | 顯微組織 | zh_TW |
| dc.subject | 變態溫度 | zh_TW |
| dc.subject | Ti-rich TiNi shape memory alloys | en |
| dc.subject | transformation temperatures | en |
| dc.subject | microstructure | en |
| dc.subject | sintering process | en |
| dc.subject | powder metallurgy | en |
| dc.title | 以粉末冶金製備富鈦TiNi形狀記憶合金及其變態性質之研究 | zh_TW |
| dc.title | Powder Metallurgy Fabricated Ti-rich TiNi Shape Memory Alloys and Their Transformation Behavior Study | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 黃坤祥(Kuen-Shyang Hwang),林新智,周棟勝,張世航 | |
| dc.subject.keyword | TiNi形狀記憶合金,粉末冶金,燒結機制,顯微組織,變態溫度, | zh_TW |
| dc.subject.keyword | Ti-rich TiNi shape memory alloys,powder metallurgy,sintering process,microstructure,transformation temperatures, | en |
| dc.relation.page | 128 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2010-01-19 | |
| 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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