臺灣博碩士論文加值系統

本研究探討鈰的添加量不同對鋁鎂矽合金的顯微組織、硬度及腐蝕行為的影響，依照重量百分比添加8 wt%、12 wt%及16 wt%的鈰金屬，在真空感應熔煉爐中製備出鋁鈰合金，凝固後從模具中取出鑄件並進行T6處理，然後分別使用光學顯微鏡(OM)、電子顯微鏡結合能量散射光譜儀(SEM-EDS)、X光繞射儀(XRD)對合金的顯微組織與相進行分析評估。實驗結果表示，AA6061鋁合金的組織主要由初生相(α-Al)及析出相(Mg2Si)所組成，透過添加鈰金屬，材料中也形成Al11Ce3相和Ce3Al4Si6相，隨著鈰含量的增加，初生Al11Ce3相的形態從最初的顆粒狀變為針狀和或粗片狀。與不添加鈰之合金相比，合金的硬度隨著鈰含量的增加而提高。在AA6061中添加鈰，使得腐蝕電流密度降低，增強了合金的耐腐蝕性，且隨著添加量的提升，抗腐蝕能力愈好。T6熱處理不僅減少了鑄造組織的化學偏析，而且提高了耐腐蝕性。

The purpose of this study was to investigate the influence of the addition of cerium (Ce) on the microstructure, hardness and corrosion properties of Al-Mg-Si alloy. Three different alloys containing various amounts of Ce (8, 12 and 16 wt%) were prepared through a vacuum induction furnace. After solidification, the castings were removed from the die then treated with a T6 heat treatment. The microstructure and phase analysis of the alloys were evaluated using optical microscopy (OM), scanning electron microscopy combined with energy dispersive spectrometry (SEM-EDS) and X-ray diffraction (XRD), respectively. The results revealed that the microstructure of the alloys were mainly composed of a primary phase (α-Al), however, by addition of Ce, the Al11Ce3 and Ce3Al4Si6 phases were also formed in the material. Moreover, it was further evident that with the increase in Ce content, the morphology of the primary Al11Ce3 phase changed from the initial particle-like to relatively needle-like and/or coarse flake shapes. It was also observed that the hardness of alloys was varied with addition of Ce compared to without addition of Ce. Adding Ce enhanced corrosion resistance, which was represented by the decrease of corrosion current density. T6 heat treatment not only reduced chemical segregation of cast structures but also improved corrosion resistance.

摘要 ...i
Abstract ...ii
誌謝 ...iii
目錄 ...iv
表目錄 ...v
圖目錄 ...vi
第一章 緒論 ...1
第二章 文獻回顧 ...2
2.1 鋁合金簡介 ...2
2.2 鋁合金的特性與分類 ...2
2.3 6XXX系鋁合金的特性與應用 ...5
2.4 合金元素對鋁合金之影響 ...5
2.5 鋁合金強化機制 ...8
2.6 鋁合金之熱處理 ...11
2.7 稀土元素對鋁合金之影響 ...13
2.8 國內外相關研究 ...15
第三章 實驗方法與步驟 ...19
3.1 實驗流程 ...19
3.2 實驗合金製備 ...20
3.3 熱處理流程 ...20
3.4 顯微組織觀察 ...22
3.5 SEM觀察與EDS分析 ...23
3.6 X光繞射分析 ...23
3.7 硬度試驗 ...24
3.8 電化學試驗 ...25
第四章 實驗結果與討論 ...27
4.1 顯微組織的觀察與分析 ...27
4.2 SEM觀察與EDS分析 ...35
4.3 X光繞射分析 ...50
4.4 微小硬度試驗 ...51
4.5 電化學分析 ...53
第五章 結論 ...59
參考文獻 ...60
Extended Abstract ...62

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