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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81214完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人(Jer-Ren Yang) | |
| dc.contributor.author | Yow-Shiuan Liaw | en |
| dc.contributor.author | 廖宥瑄 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:36:37Z | - |
| dc.date.available | 2021-08-11 | |
| dc.date.available | 2022-11-24T03:36:37Z | - |
| dc.date.copyright | 2021-08-11 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-08-02 | |
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Renou, 'Precipitation kinetics in a severely plastically deformed 7075 aluminium alloy,' Acta Materialia, 2014. vol. 66, pp. 105-117. [135] M. Fourmeau, C. D. Marioara, T. Børvik, A. Benallal, and O. S. Hopperstad, 'A study of the influence of precipitate-free zones on the strain localization and failure of the aluminium alloy AA7075-T651,' Philosophical Magazine, 2015. vol. 95, no. 28-30, pp. 3278-3304. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81214 | - |
| dc.description.abstract | "本實驗使用由傑出材料所提供高強度Al-Zn-Mg-Cu系列之鑄材A800。採用兩面擠製之製程，透過嚴重塑性變形的方式，希望能得到類似於超細晶的晶粒細化功效。同時，經過擠型的材料，晶粒會產生特定方向的分布取向稱為織構。織構的產生會帶來織構強化的效應。而由高變型量所帶來的內部缺陷，被認為會促進析出物的生成以及相變，增加其析出強化的效果。因此，以此製程為中心，探討此製程在各階段熱處理，對材料機械性質的影響，以及造成此機械性質的顯微結構與析出物。研究以拉伸試驗及硬度來分析材料之機械性質。以電子背向散射繞射 (Electron Back-Scattered Diffraction, EBSD)來進行晶粒大小以及織構強度的分析，分別討論細晶強化以及織構強化對機械性質的影響。再以穿透式電子顯微鏡 (Transmission Electron Microscope, TEM)對材料內部析出物的種類進行判斷。最後，搭配小角度X光散射儀(Small-angle X-ray scattering, SAXS)來計算析出物的大小，以及其相對體積分率和相對表面積，討論其對機械性質的影響。 研究分為三部分進行討論。第一部分討論熱擠製對機械性質的影響。隨著擠製量的增加，晶粒能有效細化，並產生<111>//ED及<100>//ED纖維織構。且變形時所帶來的大量缺陷能促使析出物析出，且擠製使析出物尺寸較小，增加析出強化的效果。第二部分討論熱擠製後經過T4X熱處理對機械性質的影響。從EBSD結果可發現晶粒細化效果仍然存在，且<111>//ED纖維織構達到飽和。從TEM及SAXS結果可以發現，經過熱處理，原本明顯的擠製促進析出效果大幅降低，可能是源自於缺陷的消失，然而還是能觀察到些微擠製刺激析出相變的現象，因此析出強化效果經擠製後表現較好。同時，一種近期才發現的Y相析出物可以於擠製後被觀察到，此析出物具有高長寬比因而被認為是很好的析出強化析出物。第三部分討論熱擠製後經過T6熱處理對機械性質的影響。結果可以發現，擠製後晶粒仍保有細化效果，而織構相比與T4X熱處理已無變化。此階段基地內皆佈滿η'與η析出物，η種類主要為η1與η2。從析出物的平均尺寸及相對體積分率仍能發現擠製促進析出物析出成長相變的現象。然而η析出物的轉變會使析出強化效果較差。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-24T03:36:37Z (GMT). No. of bitstreams: 1 U0001-3007202116321800.pdf: 15882354 bytes, checksum: a5c35de8b6185c21e7f082f387e09f95 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | " 口試委員會審定書 I 致謝 II 中文摘要 IV ABSTRACT V CONTENTS VII LIST OF FIGURES X LIST OF TABLES XX LIST OF EQUATION XXI CHAPTER 1 前言 1 CHAPTER 2 文獻回顧 3 2.1 嚴重塑性變形 (SEVERE PLASTIC DEFORMATION, SPD) 3 2.1.1 反覆鐓粗擠製(RUE)製程介紹 4 2.1.2 熱變形的鋁合金結構變化 5 2.1.3 機械性質的影響 6 2.2 織構 (TEXTURE) 7 2.2.1 極圖 (Pole Figure)及反極圖 (Inverse Pole Figure) 7 2.2.2 FCC 擠製織構介紹 10 2.3 鋁合金之發展 13 2.3.1 鋁合金介紹 13 2.3.2 鋁合金時效處理介紹 14 2.3.3 鋁合金中元素添加之影響 20 2.4 鋁合金析出物 23 2.4.1 析出物之介紹及鑑定 23 2.4.2 析出物之量化 35 CHAPTER 3 實驗設計及步驟 40 3.1 實驗流程 40 3.1.1 實驗材料 40 3.1.2 製程及熱處理設計 40 3.2 實驗儀器與設備 45 3.2.1 拉伸試驗機 (Tensile Tester) 45 3.2.2 電子背向散射繞射 (Electron Back-Scattered Diffraction, EBSD) 45 3.2.3 穿透式電子顯微鏡 (Transmission Electron Microscope, TEM) 46 3.2.4 光學顯微鏡 (Optical Microscope) 47 3.2.5 HV 顯微硬度計 (Vickers Hardness Tester) 47 3.2.6 差示掃描量熱儀(Differential scanning calorimetry, DSC) 47 3.2.7 小角度X光散射儀(Small-angle X-ray scattering, SAXS) 48 CHAPTER 4 結果與討論 49 4.1 兩面擠製不經過時效處理 49 4.1.1 OM結果觀察及分析 49 4.1.2 EBSD顯微結構與織構觀察及分析 50 4.1.3 TEM顯微結構觀察與分析 57 4.1.4 SAXS實驗結果與分析 62 4.1.5 DSC實驗結果與分析 70 4.1.6 機械性質之影響 72 4.1.7 小結 75 4.2 兩面擠製經過T4X熱處理後之影響 76 4.2.1 OM結果觀察及分析 76 4.2.2 EBSD顯微結構與織構觀察及分析 77 4.2.3 TEM顯微結構觀察與分析 82 4.2.4 SAXS實驗結果與分析 91 4.2.5 機械性質之影響 98 4.2.6 小結 102 4.3 兩面擠製經過T6熱處理後之影響 104 4.3.1 EBSD顯微結構與織構觀察及分析 104 4.3.2 TEM顯微結構觀察與分析 110 4.3.3 SAXS實驗結果與分析 118 4.3.4 人工時效過程硬度變化結果 124 4.3.5 機械性質之影響 125 4.3.6 小結 128 CHAPTER 5 結論 130 CHAPTER 6 未來工作 133 REFERENCES 135" | |
| dc.language.iso | zh-TW | |
| dc.subject | 嚴重塑性變形 | zh_TW |
| dc.subject | T4X熱處理 | zh_TW |
| dc.subject | 纖維織構 | zh_TW |
| dc.subject | 晶粒細化 | zh_TW |
| dc.subject | 反覆鐓粗擠製 | zh_TW |
| dc.subject | T6熱處理 | zh_TW |
| dc.subject | 鋁合金 | zh_TW |
| dc.subject | 小角度散射 | zh_TW |
| dc.subject | 穿透式電子顯微鏡 | zh_TW |
| dc.subject | 析出強化 | zh_TW |
| dc.subject | Grain-boundary strengthening | en |
| dc.subject | Small Angle X-ray Scattering (SAXS) | en |
| dc.subject | Transmission Electron Microscope (TEM) | en |
| dc.subject | T6 heat treatment | en |
| dc.subject | T4X heat treatment | en |
| dc.subject | Precipitate strengthening | en |
| dc.subject | Texture strengthening | en |
| dc.subject | Aluminium alloys | en |
| dc.subject | Severe Plastic Deformation | en |
| dc.title | 兩面擠製對A800鋁合金之顯微結構及析出物之影響 | zh_TW |
| dc.title | The Effects of Two-Side Extrusion on Microstructure and Precipitation of A800 Aluminum Alloy | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳志遠(Hsin-Tsai Liu),洪衛朋(Chih-Yang Tseng) | |
| dc.subject.keyword | 鋁合金,嚴重塑性變形,反覆鐓粗擠製,晶粒細化,纖維織構,T4X熱處理,T6熱處理,析出強化,穿透式電子顯微鏡,小角度散射, | zh_TW |
| dc.subject.keyword | Aluminium alloys,Severe Plastic Deformation,Grain-boundary strengthening,Texture strengthening,Precipitate strengthening,T4X heat treatment,T6 heat treatment,Transmission Electron Microscope (TEM),Small Angle X-ray Scattering (SAXS), | en |
| dc.relation.page | 146 | |
| dc.identifier.doi | 10.6342/NTU202101939 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-08-04 | |
| 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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