請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95500完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人 | zh_TW |
| dc.contributor.advisor | Jer-Ren Yang | en |
| dc.contributor.author | 梁書誠 | zh_TW |
| dc.contributor.author | Shu-Cheng Liang | en |
| dc.date.accessioned | 2024-09-11T16:12:17Z | - |
| dc.date.available | 2024-09-12 | - |
| dc.date.copyright | 2024-09-11 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-08 | - |
| dc.identifier.citation | [1] J.R. Davis, Aluminum and aluminum alloys, ASM international1993.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95500 | - |
| dc.description.abstract | 本研究探討材料微結構與機械性質之關聯，以7系列鋁合金作為研究對象。7系列鋁合金透過奈米析出物η、η’ 提高機械強度，本研究透過掃描/穿透式電子顯微鏡（Scanning/Transmission Electron Microscope, S/TEM）觀察析出物分布、尺寸與形貌，並藉由高解析穿透式影像（HR-TEM）解析η的複雜方位關係，與高解析掃描式電子顯微鏡（HR-STEM）拍攝η原子級影像，深入探索其中的缺陷及雙晶關係。
本研究的第一部分探討施加應變對於AA7075鋁合金中析出物的影響，分析其對於機械性質的影響，並提出改良製程以有效提高降伏強度。研究中發現，時效前的預變形（Pre-stretching）所導入的差排，會在後續時效析出過程中，導致析出物在差排上的粗化，從而對析出強化產生負面效果。為了解決這一問題，本研究提出了時效中期變形（Interrupted-stretching）製程，能有效減少析出物的粗化程度，在相同應變量6%的情況下，提高AA7075合金降伏強度43 MPa。 本研究的第二部分針對η原子級影像進行深入分析，在析出物η中辨認了三種雙晶關係，並且因為雙晶關係產生新的析出物種類η17。此外，研究還發現η（C14結構）具有C15結構的前驅物，並且通過原位相轉變（In-situ transformation）機制進行轉變。前驅物的揭示解釋了η多種方位關係及其中缺陷（包括疊差Stacking Faults和雙晶Twins）的起源。 | zh_TW |
| dc.description.abstract | This study investigates the relationship between microstructure and mechanical properties of AA7xxx series aluminum alloys. These alloys enhance mechanical strength through nano-precipitates η and η’. Using Scanning/Transmission Electron Microscopy (S/TEM), the distribution, size, and morphology of the precipitates were observed. High-Resolution Transmission Electron Microscopy (HR-TEM) was used to analyze the complex orientation relationships of η, and High-Resolution Scanning Transmission Electron Microscopy (HR-STEM) captured atomic-level images of η, exploring defects and twinning relationships in detail.
The first part of this study examines the effect of applied strain on the precipitation evolution in AA7075 aluminum alloy and its impact on mechanical properties. A process improvement is proposed to effectively increase the yield strength. It was found that dislocations introduced by pre-stretching before aging lead to coarsening of precipitates along dislocations during subsequent aging, negatively affecting precipitation strengthening. An interrupted-stretching process during mid-aging was proposed to mitigate precipitate coarsening. With the same 6% strain, this process can improve the yield strength by 43 MPa in the present AA7075 alloy. The second part of this study provides an in-depth analysis of atomic-level images of η precipitates, identifying three types of twinning relationships. These relationships resulted in a new precipitate orientation relationship, η17. Additionally, it was discovered that η (C14 structure) has a precursor with C15 structure, which transforms via an in-situ transformation mechanism. The revelation of this precursor explains the various orientation relationships of η and the origins of defects, including stacking faults and twins. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-09-11T16:12:17Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-09-11T16:12:17Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Contents
口試委員會審定書 i 中文摘要 ii Abstract iii 誌謝 v Contents vi List of Figures ix List of Tables xvi Chapter 1 Introduction 1 Chapter 2 Literature Review 3 2.1 Brief introduction to aluminum alloys 3 2.2 Introduction to AA7xxx alloys 4 2.3 Solute effects in AA7075 alloys 5 2.3.1 Major addition: Zn, Mg, Cu 6 2.3.2 Minor addition: Ag, Mn, Cr, Ti, Zr, V, Fe and Si 7 2.4 Heat treatment for AA7xxx alloys 8 2.5 Precipitation hardening 10 2.6 Precipitate evolution in AA7075 aluminum alloys 12 2.6.1 GPI and GPII Zone 13 2.6.2 η’ and η 15 2.6.3 Atomic structures of η’, and other precursors of η 19 2.6.4 Atomic structure of η 23 2.6.5 Defects in η bulk and η / Al interface 23 2.7 Effect of deformation on age-hardenable aluminum alloys 28 2.7.1 Introduction of pre-deformation on aluminum alloys 28 2.7.2 Pre-deformation impacts on yield strength and hardness 29 2.7.3 Pre-deformation impacts on stress corrosion cracking (SCC) resistance and quenching sensitivity 30 2.7.4 Pre-deformation impacts on microstructural effects 31 2.7.5 Mechanism explanation, and strategies against the adverse effects of pre-deformation 34 Chapter 3 Experimental Procedures and Analysis Methods 36 3.1 Material 36 3.2 Heat treatments 36 3.3 Hardness test 37 3.4 Tensile test 38 3.5 Field emission scanning / transmission electron microscope (FE-S/TEM) 39 3.5.1 Sample preparation 39 3.5.2 Bright field and dark field image 39 3.5.3 High resolution transmission electron microscopy (HRTEM) 40 3.5.4 Scanning transmission electron microscope (STEM): annular-dark-field (ADF) and high angle annular-dark-field (HAADF) 40 3.6 Diffraction pattern simulation 41 3.7 HAADF image simulation 41 3.8 Precipitate quantification 42 Chapter 4 Deformation Effects on Precipitation 44 4.1 Simulated diffraction patterns of η types and morphologies of η’ and η2 44 4.2 Mechanical properties: hardness and tensile test results 47 4.3 TEM Microstructure: Unstretched-20 h and PS2%-20 h 50 4.4 TEM Microstructural evolution: PS6% 55 4.5 TEM Microstructure: IS6%-20h 63 4.6 Discussion: Pre-deformation and interrupted-deformation effects 64 Chapter 5 Atomic-Resolution Analysis of Precipitation Evolution 66 5.1 HAADF-STEM image simulation of Laves phases 66 5.2 Atomic structure of η1: zig-zag structure, stacking faults, and hexagonal defect chains 67 5.3 [11"2" 0]η Axis-angle pair relationship between η precipitates under typical low-index Al zones 72 5.4 C15 precursor and Laves phases transformation induced twinning in η precipitates 75 5.4.1 In-situ transformation: from C15 precursor to C14-η 75 5.4.2 C-{20"2" 5}{20"23" }twin by double synchroshear from C15 precursor 80 5.4.3 B-{20"2" 1}twin by double synchroshear from twinned C15 precursor 86 5.5 Discussion: atomic scale observation of η 88 5.5.1 Comparison of the observed C15 precursor ηp to previous HAADF results 88 5.5.2 C15 Precursors, B-twin and C-twin 90 5.5.3 Twin formation mechanisms: C15 precursor and stacking fault regions 94 5.5.4 Origins of η type complexity and defects: transformation from C15 precursors, and basal shifting mechanism 97 5.5.5 Lave phase transformation and stacking faults in C14-η structure in Al-Zn-Mg-Cu Alloys 100 5.5.6 Morphologies of η1 101 5.6 Other twinning type observation: {1"2" 12}η twinning 102 Chapter 6 General Conclusion 103 Chapter 7 Future Works 104 Reference 105 | - |
| dc.language.iso | en | - |
| dc.subject | 預變形 | zh_TW |
| dc.subject | AA7075鋁合金 | zh_TW |
| dc.subject | Al-Zn-Mg-Cu | zh_TW |
| dc.subject | 奈米級析出物 | zh_TW |
| dc.subject | η相 | zh_TW |
| dc.subject | 雙球面像差校正掃描式電子顯微鏡 | zh_TW |
| dc.subject | 拉弗斯相 | zh_TW |
| dc.subject | 方位關係 | zh_TW |
| dc.subject | 原位相轉變 | zh_TW |
| dc.subject | 穿透式電子顯微鏡 | zh_TW |
| dc.subject | 原子級影像 | zh_TW |
| dc.subject | Orientation relationships | en |
| dc.subject | Transmission electron microscopy | en |
| dc.subject | η phase | en |
| dc.subject | Nanoscale precipitates | en |
| dc.subject | Al-Zn-Mg-Cu | en |
| dc.subject | AA7075 aluminum alloys | en |
| dc.subject | In-situ transformation | en |
| dc.subject | Cs-corrected scanning-transmission electron microscopy | en |
| dc.subject | Atomic-resolution image | en |
| dc.subject | Laves phases | en |
| dc.subject | Pre-stretching | en |
| dc.title | 變形對AA7075鋁合金顯微結構的影響及 η相析出物中相變誘導雙晶之原子級研究 | zh_TW |
| dc.title | Deformation Effects on AA7075 Microstructure and Atomic Study of Transformation-Induced Twinning in η Precipitates | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 鍾采甫;王涵聖;陳志遠;蕭健男 | zh_TW |
| dc.contributor.oralexamcommittee | Tsai-Fu Chung;Han-Shen Wang;Chih-Yuan Chen;Chien-Nan Hsiao | en |
| dc.subject.keyword | AA7075鋁合金,Al-Zn-Mg-Cu,奈米級析出物,η相,預變形,拉弗斯相,方位關係,原位相轉變,穿透式電子顯微鏡,雙球面像差校正掃描式電子顯微鏡,原子級影像, | zh_TW |
| dc.subject.keyword | AA7075 aluminum alloys,Al-Zn-Mg-Cu,Nanoscale precipitates,η phase,Pre-stretching,Laves phases,Orientation relationships,In-situ transformation,Transmission electron microscopy,Cs-corrected scanning-transmission electron microscopy,Atomic-resolution image, | en |
| dc.relation.page | 117 | - |
| dc.identifier.doi | 10.6342/NTU202402950 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2024-08-10 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 材料科學與工程學系 | - |
| dc.date.embargo-lift | 2029-07-31 | - |
| 顯示於系所單位： | 材料科學與工程學系 | |
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