本研究以差示掃描量熱儀(DSC)、電子微探儀(FE-EPMA)、光學顯微鏡(OM)、導電度量測(%IACS)、電子顯微鏡(TEM、SEM-EBSD)等分析Al-4.9Cu-1.2Mg (AA2024)高強度鋁合金微結構，並以硬度及拉伸試驗，探討微量鋯與均質化對T4態AA2024鋁合金微結構與機械性質之影響。

Using the differential scanning calorimetry (DSC), the electron probe X-ray micro-analyzer (FE-EPMA), the optical microscope (OM), the electrical conductivity meter (% IACS), the electron microscope (TEM, SEM-EBSD), tensile test and hardness test to analyze the microstructure and mechanical properties of the alloys. In order to discuss the effect of minor Zr and homogenization on the microstructure and mechanical properties of the T4 state of Al-4.9Cu-1.2Mg (AA2024) alloys.

摘要 I
Abstract II
謝誌 III
總目錄 IV
圖目錄 VII
表目錄 XI
一、前言與文獻回顧 1
1.1 AA2024鋁合金簡介 2
1.1.1 析出強化機制 2
1.1.2 AA2024之析出過程、時效熱處理與時效硬化曲線 4
1.2 鋁合金之熱加工性質 7
1.2.1 鋁合金擠製性 (Extrudability) 7
1.2.2 合金擠製性(擠製速度)之限制 8
1.2.3 均質化與元素對合金微結構與固相溫度之影響 10
1.2.3 (a)均質化對鋁合金熱加工性質之影響 10
1.2.3 (b)合金元素對2000系鋁合金固相溫度之影響 10
1.3 鋁合金之再結晶與晶粒細化 13
1.3.1 鋁合金冷加工與製程退火 13
1.3.2 再結晶動力－冷加工 (儲存能)與再結晶溫度 14
1.3.3 晶粒細化－抑制再結晶與晶粒成長 14
1.3.3 (a)添加微量元素Mn, Zr, Sc對鋁合金再結晶之影響 14
1.3.3 (b)均質化熱處理對鋁合金微結構之影響 22
二、實驗方法與步驟 25
2.1合金鑄造與實驗步驟 25
2.1.1合金熔配 25
2.1.2均質化 26
2.1.3熱輥軋與退火 26
2.1.4冷輥軋與T4熱處理 26
2.2實驗流程圖、實驗儀器與試片取樣圖 27
2.3微觀結構觀察與分析 30
2.3.1光學顯微鏡 (Optical Microscopy, OM) 30
2.3.2電子微探儀 (High-Resolution Hyper Probe, FE-EPMA) 30
2.3.3差式掃描量熱儀 (Differential Scanning Calorimetry, DSC) 30
2.3.4導電度量測(Electrical Conductivity) 31
2.3.5穿透式電子顯微鏡(Transmission Electron Microscope, TEM) 31
2.3.6掃描式電子顯微鏡(Electron Backscatter Diffraction, EBSD) 31
2.4機械性質分析 32
2.4.1硬度試驗(Hardness) 32
2.4.2拉伸試驗(Tensile test) 32
三、結果與討論 33
3.1微觀結構分析 33
3.1.1 鑄態與均質態之微結構 33
3.1.1 (a)光學顯微鏡觀察與電子微探儀分析－晶出相分析 33
3.1.1 (b)差示掃描量熱儀分析 41
3.1.1 (d)穿透式電子顯微鏡分析 45
3.1.2 導電度分析 49
3.1.3 冷輥與T4態之微結構 51
3.1.3 (a)光學顯微鏡觀察－晶粒形貌分析 51
3.1.3 (b)掃描式電子顯微鏡－EBSD分析 60
3.2機械性質與破斷微結構分析 62
四、 結論 64
五、 參考資料 65

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