本研究探討摩擦攪拌製程(FSP)改質處理對AZ91和LZ91鎂合金微觀組織、相組成、機械性質，以及在模擬體液SBF及漢克溶液HBSS兩種溶液下之抗腐蝕特性。實驗結果顯示AZ91鎂合金因摩擦攪拌改質後，能有效將γ相均勻分散並固溶進α相中，並產生晶粒細化效果，進而使硬度值、拉伸性質有所提升；LZ91經FSP改質後，攪拌區內α與β相晶粒皆獲得細化且均勻分散，硬度值提升，但拉伸強度略為降低，XRD分析發現經FSP改質後之AZ91與LZ91合金優選方位改變。從電化學極化曲線及交流阻抗量測結果得知經過FSP改質後之組織對於AZ91與LZ91合金的抗腐蝕性獲得提升，在微觀結構分析亦發現晶粒細化能有效減緩腐蝕的進行。本實驗亦利用XRD及SEM分析並觀察試片在不同生理環境溶液中，經過長時間浸泡後的腐蝕產物之相組成與表面形貌特徵。

The present study is to investigate the effects of friction stir processing (FSP) on the microstructural features, phase composition, tensile mechanical properties and anti-corrosion performances of AZ91 and LZ91 Mg alloys in simulated body fluid (SBF) and Hank’s solution (HBSS). Experimental results show that the γ-Mg17Al12 particles can be uniformly dispersed and dissolved in α-Mg matrix of AZ91 alloy after FSP modification. The grain refining effect during FSP results in the improvement of microhardness and tensile strength of AZ91-FSP specimens. In addition, both of Mg-rich α-phase and Li-rich β-phase of the dual-phase LZ91 alloy are refined and uniformly dispersed after FSP. The microhardness within the stir zone (SZ) is slightly increased, but the tensile strength is decreased for the LZ91-FSP specimens. XRD analysis results show that the preferred orientations of AZ91 and LZ91 alloys are changed after FSP modification. Electrochemical polarization measuring results show that the anti-corrosion resistance is improved for AZ91-FSP and LZ91-FSP specimens. The grain refining effect after FSP can help to reduce the corrosion rate. The corrosion products and surface morphologies of AZ91-FSP and LZ91-FSP specimens after long-term immersion tests are analyzed and observed by XRD and SEM.

摘要..........i
Abstract......ii
誌謝...........iv
目錄........v
表目錄....vii
圖目錄.....viii
第一章 前言.....1
第二章 文獻回顧...2
2-1 鎂合金及常見之合金元素..2
2-2 摩擦攪拌改質....3
2-2-1 摩擦攪拌組織特性...3
2-2-2 摩擦攪拌參數.....4
2-3 電化學腐蝕原理與機制....4
2-3-1 鎂金屬之電化學特性.....4
2-3-2 金屬腐蝕及電化學反應....5
2-3-3 腐蝕速率測試....5
第三章 實驗內容與方法...16
3-1 實驗材料及材料成分分析....16
3-2 摩擦攪拌改質製程(Friction Stir Processing, FSP)...16
3-3 微觀組織分析.....16
3-3-1 金相組織分析(OM)....16
3-3-2 表面及橫截面組織觀察及成分分析(SEM)....16
3-3-3 場發高解析電子探測儀分析(EPMA)....17
3-4 相組成分析....17
3-5 機械性質量測....17
3-5-1 硬度量測...17
3-5-2 拉伸試驗.....17
3-6 電化學腐蝕試驗...18
3-6-1 開路電位(OCP)量測....18
3-6-2 動電位極化曲線測試分析(LP)....18
3-6-3 電化學交流阻抗頻譜分析(EIS)....18
3-6-4 浸泡試驗之重量損失計算...18
第四章 實驗結果與討論....26
4-1 FSP 改質鎂合金之微觀組織觀察...26
4-1-1 OM金相微觀組織觀察...26
4-1-2 SEM微觀組織與EDS成分分析..26
4-1-3 EPMA成分分析...27
4-2 FSP 改質之XRD相組成....27
4-3 FSP 改質之機械性質...27
4-3-1 微小硬度量測...27
4-3-2 拉伸性質測試...28
4-3-3 拉伸破斷面與次表面觀察...28
4-4 FSP 改質之抗腐蝕分析...29
4-4-1 電化學腐蝕分析...29
4-4-2 浸泡腐蝕分析...31
第五章 結論...90
參考文獻...91
Extended Abstract...95

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