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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43184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 | Wen-Li Tsai | en |
| dc.contributor.author | 蔡文力 | zh_TW |
| dc.date.accessioned | 2021-06-15T01:41:22Z | - |
| dc.date.available | 2009-08-14 | |
| dc.date.copyright | 2009-08-14 | |
| dc.date.issued | 2009 | |
| dc.date.submitted | 2009-07-13 | |
| dc.identifier.citation | 1. K.U. Kainer (ed.), “Magnesium-Alloys and Technologies”, WILEY-VCH Verlag GmbH & Co. KG aA, Weinheim, 2003.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43184 | - |
| dc.description.abstract | 本研究主要利用動態機械分析儀（DMA）之測試，探討商業用AZ80合金和LAZ1110鎂鋰合金在各溫度下之制振能，並藉由硬度量測、顯微組織觀察與XRD分析等，協助瞭解冷軋延或時效處理對鎂合金制振能的影響，以及各個制振峰及200-300℃區間高溫制振背景值（HTDB）之機制。經測試結果顯示，AZ80合金在HTDB的溫度區間內，不論有無後續的100℃時效處理，經過20%冷軋延後其HTDB制振能皆可獲得明顯的提升。然而，形成HTDB的活化能卻在冷軋延後由1.69eV降至1.37eV，表示冷軋過程會加速合金內部之擴散作用，並同時促進潛變的發生。因此，當AZ80合金的應用拓展到HTDB之溫度區間時，冷軋延對其制振能以及抗潛變能力的正反兩面影響，是需要被審慎考量的。對LAZ1110合金而言，無論是剛取得之擠製板材或者不同程度之冷軋薄板，其制振能於升溫過程依序均有P1、P2與P3三個制振峰出現。而冷軋程度愈大者，不僅於室溫下tanδ值愈高，其P3峰頂的溫度也會愈往低溫平移，且均在鎂金屬的再結晶溫度200℃附近。經研究結果推斷，鎂鋰合金有P3峰的出現與基材上β(200)優選晶位極為相關，且在大量冷軋延後還涉及再結晶作用。另外，以0.1Hz之低頻率對80%冷軋延之LAZ1110合金薄板進行DMA測試，可於室溫下有效達到高制振能材料之標準（即tanδ≧0.03）。 | zh_TW |
| dc.description.abstract | Damping capacities (DCs) of AZ80 and LAZ1110 magnesium alloys are investigated by Dynamic Mechanical Analyzer (DMA) at the temperature range of 0-300℃. DC of the high-temperature damping background (HTDB) at 200-300℃ for AZ80 alloy increases significantly after 20% cold-rolling with or without aging. However, the activation energy of HTDB decreases from 1.69eV to 1.37eV, which indicates cold-rolling can accelerate alloy’s diffusion process and promote its creep development simultaneously. Consequently, the contrary cold-rolling effect on DC and creep resistance of AZ80 alloy should be taken into account carefully for its high-temperature applications. Three damping peaks P1, P2 and P3 are observed for LAZ1110 Mg-Li alloy. Severe cold-rolling can effectively improve the DC of LAZ1110 alloy at room temperature. The P3 peak located at about 200℃ shifts to lower temperature if the extent of cold-rolling increases. Experimental results show that, after severe cold-rolling, the formation of P3 peak is well-related to β(200) preferred orientation and caused by recrystallization process. Besides, high damping criterion (tanδ≧0.03) can be met at room temperature for 80% cold-rolled LAZ1110 sheet tested at 0.1Hz low frequency or at 30-35μm operating amplitude. | en |
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| dc.description.tableofcontents | 誌謝……………………………………………………………………………...…...…..i
中文摘要..........................................................................................................................iii 英文摘要...........................................................................................................................v 目錄………………………………………………………………………………….…vii 第一章 前言….................................................................................................................1 第二章 文獻回顧.............................................................................................................3 2-1 簡介………………...……..…..........................................................................3 2-2 鎂與鎂合金之應用………………………………………….….………….…3 2-3 鎂合金之成分及命名方法…...........................................................................4 2-4 鎂合金添加元素之影響…...………………………………………………....5 2-4-1 常見之合金元素……………………………………………………….5 2-4-1-1 鋁（Al）…………………………………………………….……5 2-4-1-2 鋅（Zn）……………………………………………………….....5 2-4-1-3 錳（Mn）………………………………………………….……...6 2-4-1-4 鋯（Zr）………………………………………………………….6 2-4-1-5 鋰（Li）…………………………………………………………..6 2-4-1-6 矽（Si）……………………………………………………...…...7 2-4-1-7 鈣（Ca）………………………………………………………….7 2-4-1-8 稀土元素（RE）………………………………………..………..7 2-4-2 微量添加元素……………………………………………………...…..8 2-4-2-1 雜質：鐵（Fe）、鎳（Ni）、銅（Cu）…………………………...8 2-4-2-2 鈹（Be）…………………………...………………………..……8 2-4-2-3 鈧（Sc）………………………………………………………...8 2-5 AZ系列鎂合金…………………………………..............................................8 2-6 鎂鋰合金……………………..……………………………………………...10 2-6-1 BCC/HCP結構間之晶位關係…………………………………….….10 2-6-1-1 軸向比之相依性……………………………………………...10 2-6-1-2 結晶方位關係……………………………………………..….12 2-6-2 顯微結構之演變……………………………………………….……..12 2-7材料之阻尼特性…………………………………………………………..…13 2-7-1 材料內部的能量散失…………………………………………...…....13 2-7-2 阻尼特性之流變模型…………………………………………….…..13 2-7-3 高制振能材料………………………………………………………...16 2-8 金屬材料之阻尼機制…...…...………………………………………….…..18 2-8-1點缺陷制振峰………………………………………………..………..18 2-8-1-1 Snoek效應……………………………………………...……...18 2-8-1-2 Zener效應……………………………………………..………19 2-8-2 差排制振峰……………………………………………….…….…….19 2-8-3 晶界制振峰…...……………………………………………………....19 2-8-4 高溫制振背景值（HTDB）………………………………………...….20 第三章 實驗方法與儀器...............................................................................................39 3-1 實驗流程…………………………......……………………………………...39 3-2 材料來源.........................................................................................................39 3-2-1 AZ80合金…...……………………………………………………...…39 3-2-2 LAZ1110合金…...……………………………………………….....…40 3-3 密度量測.........................................................................................................40 3-4 冷軋延（Cold Rolling，CR）.........................................................................41 3-5 熱處理….........................................................................................................41 3-6 DMA分析.........................................................................................................42 3-6-1 DMA2980之本體組成與附加組件……………………………..……42 3-6-2 DMA2980之儀器規範……………………………………..…………43 3-6-3 單�雙懸臂之間的考量………...…………………………………....44 3-6-4 試片的製備要點…………………………………………….……..…44 3-7 顯微組織觀察……………...……………………………………………...…45 3-7-1 一般金相觀察………………………………………………......…….45 3-7-2 穿透式電子顯微鏡（Transmission Electron Microscope，TEM）……45 3-8 XRD分析……………………………………………………...…………...…45 3-9 維氏硬度測試（Microvickers Hardness Test）………………….……….…...46 第四章 AZ80合金之制振能探討.................................................................................55 4-1剛取得之AZ80板材制振能............................................................................55 4-1-1 基本制振特性………………………………………………………...55 4-1-2 與純鎂或其他AZ系列鎂合金之制振能比較…………………...….56 4-1-3 頻率對制振能之影響……………………………………………...…57 4-1-4 振幅對制振能之影響………………………………………………...58 4-2 不同熱機處理條件下之硬度量測…………………………………...…...…60 4-3 冷軋延後AZ80薄板之制振能......……………..……………………………60 4-3-1 冷軋延對制振能之影響…………………………………………...…61 4-3-2 金相觀察……………………………………………………………...62 4-3-3 頻率對制振能之影響………………………………………………...62 4-4 冷軋延且時效過後AZ80薄板之制振能……................................................62 4-4-1時效溫度對制振能之影響……………………………………............63 4-4-2時效時間對制振能之影響…………...…………………………….…64 4-5 高溫制振背景值（HTDB）之分析與探討…………………………………65 4-5-1 HTDB活化能之數據分析……………………………………………65 4-5-2 冷軋延對HTDB之影響…………………………………………..….67 4-5-3 不同合金之HTDB比較………………………………………….…..68 4-5-4 100℃時效對HTDB之影響……………………………………….….69 第五章 LAZ1110合金之制振能探討……………………...…………………………87 5-1 密度量測………………………………………………………………...…..87 5-2 剛取得之LAZ1110板材制振能……………………………………………87 5-2-1 基本制振特性……………………………………………………...…87 5-2-2 熱循環之影響……………………………………………………..….88 5-3 冷軋延後LAZ1110薄板之制振能…………………………………………89 5-3-1 冷軋程度對制振能之影響…………………………………………...89 5-3-2 不同於軋延方向對制振能之影響…………………………………...91 5-3-3 振幅對制振能之影響………………………………………………...92 5-3-4 室溫�100℃時效對制振能之影響………………………………….93 5-4 DMA測試過程之顯微組織變化………………………………………...….94 5-4-1 硬度量測…………………………………………………………...…95 5-4-2 顯微組織觀察………………………………………………………...96 5-4-3 XRD之分析結果………………………………………………….…..98 5-5 頻率對LAZ1110合金制振能之影響………………………………..……..99 5-6 制振峰P1、P2與P3之機制探討…………………………………...………..101 第六章 結論.................................................................................................................121 參考文獻.......................................................................................................................125 | |
| dc.language.iso | zh-TW | |
| dc.subject | 鎂鋰合金制振能 | zh_TW |
| dc.subject | 再結晶 | zh_TW |
| dc.subject | AZ80合金 | zh_TW |
| dc.subject | 高溫制振背景值 | zh_TW |
| dc.subject | 冷軋延 | zh_TW |
| dc.subject | AZ80 alloy | en |
| dc.subject | recrystallization | en |
| dc.subject | cold-rolling | en |
| dc.subject | damping capacity | en |
| dc.subject | Mg-Li alloy | en |
| dc.subject | DMA | en |
| dc.title | AZ80及LAZ1110鎂合金制振能之研究 | zh_TW |
| dc.title | Studies on Damping Capacities of AZ80 and LAZ1110 Magnesium Alloys | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 97-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 薛人愷,王建義(Jian-Yih Wang),薄慧雲 | |
| dc.subject.keyword | AZ80合金,鎂鋰合金制振能,冷軋延,高溫制振背景值,再結晶, | zh_TW |
| dc.subject.keyword | AZ80 alloy,Mg-Li alloy,damping capacity,cold-rolling,recrystallization,DMA, | en |
| dc.relation.page | 129 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2009-07-14 | |
| 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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