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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人(Jer-Ren Yang) | |
| dc.contributor.author | Yu-Lin Li | en |
| dc.contributor.author | 李侑霖 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:43:28Z | - |
| dc.date.available | 2021-08-06 | |
| dc.date.available | 2022-11-24T03:43:28Z | - |
| dc.date.copyright | 2021-08-06 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-07-20 | |
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Yang, Mechanical behavior and microstructural evolution of nanostructured bainite under high-strain rate deformation by Hopkinson bar, Scripta Materialia 115 (2016) 46-51. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81328 | - |
| dc.description.abstract | "本研究將在室溫(25℃)進行70%冷輥軋後的FeCoNiCr中熵合金進行850℃持溫1小時的退火熱處理以得到完全再結晶(Fully recrystallized)之顯微結構，接著分別在室溫(25℃)以及低溫(-150℃)下進行應變速率為10-3 s-1的間斷拉伸實驗，以觀察不同溫度下缺陷顯微結構演變的過程。之後同樣在室溫(25℃)以及低溫(-150℃)下進行應變速率為9000 s-1的霍普金森快速撞擊實驗，並與間斷拉伸實驗結果做比較，以觀察不同應變速率下缺陷分布以及形貌上的差異，主要透過穿透式電子顯微鏡(Transmission Electron Microscope, TEM)來進行缺陷顯微結構的分析。 由實驗結果可以得知不論是在25℃還是-150℃，FeCoNiCr中熵合金在塑性變形初期主要都是透過差排滑移(Dislocation glide)來產生變形，直到應力達到啟動雙晶所需的臨界應力值，才會開始有變形雙晶(Deformation twin)的形成。在應變速率為10-3 s-1的實驗條件下，FeCoNiCr中熵合金在25℃下即便在真實應變量為38%也就是在抗拉強度的應變階段下，僅能觀察到一組變形雙晶(Single variant of deformation twin)的形成，推測是因為應力不足所致；在-150℃下則大約在真實應變量為12%之應變階段即可觀察到兩組變形雙晶(Two variants of deformation twin)的形成。而在應變速率為9000 s-1的實驗條件下，FeCoNiCr中熵合金在25℃且真實應變量為28.8%之應變階段下，即可觀察到兩組變形雙晶的形成，而在-150℃且真實應變量為24%之應變階段下，可以在許多奈米退火雙晶(Annealing nanotwin)內部觀察到密集分布的變形雙晶，而這些密集分布的變形雙晶其厚度大部分皆小於2 nm。最後在雙晶面符合Edge-on configuration的條件下進行變形雙晶寬度(厚度)之統計，由結果可以得知不論是在25℃還是-150℃，變形雙晶之平均寬度皆隨著應變量的增加而些微下降。且若是在相同真實應變量之條件下，不論是在25℃還是-150℃下FeCoNiCr中熵合金在經過快速撞擊後相較於慢速拉伸所生成的變形雙晶皆具有較細之平均寬度。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-24T03:43:28Z (GMT). No. of bitstreams: 1 U0001-1907202115183800.pdf: 13895285 bytes, checksum: 45edec6fa654f3104359c514bcddb7aa (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | 口試委員會審定書 # 致謝 i 中文摘要 ii ABSTRACT iii CONTENTS v LIST OF FIGURES viii LIST OF TABLES xv LIST OF EQUATIONS xvi Chapter 1 前言 1 Chapter 2 文獻回顧 2 2.1 高熵合金及中熵合金 2 2.1.1 高熵合金及中熵合金之簡介 2 2.1.2 高熵合金及中熵合金之定義 4 2.2 雙晶 6 2.2.1 雙晶介紹 6 2.2.2 雙晶之方位關係 8 2.2.3 退火雙晶 9 2.2.4 變形雙晶 14 2.2.5 變形雙晶之影響因素 16 2.2.6 變形雙晶之交互作用 24 Chapter 3 實驗設計及步驟 28 3.1 實驗流程 28 3.1.1 實驗材料 29 3.1.2 軋延及熱處理 30 3.1.3 室溫及低溫間斷拉伸實驗 31 3.1.4 室溫及低溫霍普金森快速撞擊實驗 31 3.2 實驗儀器與設備 32 3.2.1 輥軋機 32 3.2.2 MTS Landmark伺服油壓式動態材料試驗機 32 3.2.3 霍普金森桿 32 3.2.4 X光繞射儀 33 3.2.5 電子背向散射繞射儀 34 3.2.6 穿透式電子顯微鏡 35 Chapter 4 結果與討論 37 4.1 拉伸及撞擊前微結構分析 37 4.1.1 均質化後EBSD顯微結構分析 37 4.1.2 冷輥軋後EBSD及TEM顯微結構分析 39 4.1.3 退火後EBSD及TEM顯微結構分析 43 4.2 室溫及低溫間斷拉伸實驗 49 4.2.1 機械性質與X光繞射儀分析 49 4.2.2 室溫下EBSD及TEM顯微結構分析 53 4.2.3 低溫下EBSD及TEM顯微結構分析 63 4.3 室溫及低溫霍普金森快速撞擊實驗 78 4.3.1 機械性質與X光繞射儀分析 78 4.3.2 室溫及低溫下EBSD顯微結構分析 81 4.3.3 室溫及低溫下TEM顯微結構分析 84 Chapter 5 結論 93 Chapter 6 未來工作 95 REFERENCE 96 | |
| dc.language.iso | zh-TW | |
| dc.subject | 變形雙晶 | zh_TW |
| dc.subject | FeCoNiCr中熵合金 | zh_TW |
| dc.subject | 間斷拉伸實驗 | zh_TW |
| dc.subject | 霍普金森快速撞擊實驗 | zh_TW |
| dc.subject | 穿透式電子顯微鏡 | zh_TW |
| dc.subject | 奈米退火雙晶 | zh_TW |
| dc.subject | Transmission electron microscope (TEM) | en |
| dc.subject | Deformation twin | en |
| dc.subject | Annealing nanotwin | en |
| dc.subject | FeCoNiCr medium-entropy alloy | en |
| dc.subject | Interrupted tensile test | en |
| dc.subject | Split Hopkinson pressure bar (SHPB) test | en |
| dc.title | FeCoNiCr中熵合金在室溫及低溫變形下缺陷顯微結構演變之研究 | zh_TW |
| dc.title | Microstructure Evolution of FeCoNiCr Medium-entropy Alloy during Deformation at Room Temperature and Cryogenic Temperature | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王星豪(Hsin-Tsai Liu),陳志遠(Chih-Yang Tseng) | |
| dc.subject.keyword | FeCoNiCr中熵合金,間斷拉伸實驗,霍普金森快速撞擊實驗,穿透式電子顯微鏡,奈米退火雙晶,變形雙晶, | zh_TW |
| dc.subject.keyword | FeCoNiCr medium-entropy alloy,Interrupted tensile test,Split Hopkinson pressure bar (SHPB) test,Transmission electron microscope (TEM),Annealing nanotwin,Deformation twin, | en |
| dc.relation.page | 99 | |
| dc.identifier.doi | 10.6342/NTU202101569 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-07-21 | |
| 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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