臺灣博碩士論文加值系統

在近年來，鋁酸鋰引起科學界廣泛與熱烈的興趣。本研究中是利用彈性常數去估算理論楊氏模數與波松比，再將理論波松比帶入實驗結果，對實驗楊氏模數與理論值做確認，確認波松比的準確性。我們利用奈米壓痕實驗研究奈米尺度下的楊氏模數與硬度.另一方面，我們利用對微米柱做單一軸向一維度的壓應力測試來得知微奈米尺度的楊氏模數，硬度，以及降伏應力。接著我們把奈米尺度的實驗結果與微奈米尺度的實驗結果做比較。再把實驗結果帶入Hertzian彈性模型，得到破壞降伏強度與臨界剪切應力。實驗結果與理論值符合，在奈米與微奈米尺度下均無應變速率對機械性質的影響，(100)平面與(001)平面比較結果發現，(001)平面有較高的硬度。
在變形微結構觀察則使用了、掃描式電子顯微鏡(SEM)和背向散射電子繞射(EBSD)等儀器。在二維奈米壓痕與一維壓應力測試中都沒有發現相變化與裂縫。差排滑移為主要的變形機制。我們在常溫下使用Berkovich壓印頭的奈米壓痕實驗中得到(100)平面的硬度為9 GPa，(001)平面的硬度為12 GPa。此外，(100)平面的楊氏模數為132 GPa，(001)平面的楊氏模數為168 GPa。

The deformation behavior and mechanical properties of  phase lithium aluminate LiAlO2 (-LAO) single crystal under various loading conditions were investigated in the present study. The theoretical Young’s modulus and Poisson ratio of -LiAlO2 were firstly extracted from elastic constant for subsequent comparison with the experimentally measured data. The experimental micro-scaled mechanical properties were obtained by microcompression testing. The nano-scaled mechanical properties, such as Young’s modulus, hardness and yield stress, were measured by using the nanoindentation system and fit by the Hertzian contact theory. The experimental micro-scaled and nano-scaled data were compared. The deformation microstructures were characterized by various techniques, including scanning electron microscopy (SEM), and electron backscattered diffraction (EBSD). By using the nanoindentation test with Berkovich indenter at room temperature, the measured modulus, hardness and yield stress values (in nano scale) are 167 GPa, 12 GPa and 10 GPa for the c-plane (001) surface, and 132 GPa, 9 GPa and 9 GPa for the a-plane (100) surface. By measuring the 2 m micropillars under microcompression, the measured modulus and yield stress values (in micro scale) are 153 GPa and 5 GPa for the c-plane (001) surface, and 111 GPa and 3 GPa for the a-plane (100) surface. The higher nano-scale values are due to the small volume constraint effect.

Content
論文審定書 i
致謝 ii
Abstract iv
中文摘要 v
Content vi
List of Tables viii
List of Figures ix
Chapter 1 Introduction 1
Chapter 2 Background and literature review 4
2-1 Methods of Growth 4
2-1-1 The Verneuil method 4
2-1-2 The Czochralski method 4
2-1-3 The Kyropoulos method 5
2-1-4 The Stepanov (Edge-Defined Film-Fed Growth, EFG) method 6
2-1-5 The Bagdasarov (Horizontally Directed Crystallization) method 6
2-2 Introduction of LiAlO2 7
2-2-1 Crystal structure of LiAlO2 7
2-2-2 Mechanical properties of LiAlO2 8
2-3 Basic properties of the tetragonal structure 9
2-3-1 Group theory of tetragonal systems 9
2-3-2 Characters of dislocation in the tetragonal structure 11
2-4 Introduction of nanoindentation testing 12
2-4-1 Mechanical properties 13
2-4-2 Deformation mechanisms 17
2-5 Introduction of microcompression testing 18
2-5-1 Micro pillar preparation 19
2-5-2 Parameters of microcompression testing 19
2-5-3 Micro-scale characterization of mechanical properties 20
Chapter 3 Experimental procedures 21
3-1 Materials preparation 21
3-2 Nano-indentation testing 21
3-3 Microcompression testing 22
3-3-1 Microcompression sample fabrication using FIB 22
3-3-2 Microcompression test using nanoindentation system 23
3-3-3 Preparation for TEM foil of the deformed micropillars 23
3-4 Property measurement and analyses 24
3-4-1 X-ray diffraction (XRD) analyses 24
3-4-2 Scanning electron microscopy (SEM) analysis 25
3-4-3 Transmission electronic microscopy (TEM) analyses 25
Chapter 4 Results and discussion 27
4.1 Structure quality identifications 27
4.1.1 X-ray diffraction analyses 27
4.2 Nanoindentation testing for -LiAlO2 32
4.3 Microcompression testing for -LiAlO2 34
4.4 SEM observations 36
4.5 Size effect 37
4.6 Orientation effect 38
Chapter 5 Conclusions 40
References 42
Tables 47
Figures 52

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