臺灣博碩士論文加值系統

本研究主要探討摩擦攪拌製程(FSP)改質效應對不同鋅鋁比之商用AZ91D及高鋅含量ZA113鎂合金微觀組織、織構、硬度、拉伸性質及破裂特徵的變化。實驗結果顯示AZ91D經FSP改質後有效促進晶粒細化，塊狀γ相亦顯著細化且均勻分散於晶界上，並發現有固溶現象發生，使得SZ區硬度值得到提升，拉伸性質方面由於γ相的分散強化及晶粒細化使得降伏強度與抗拉強度得到明顯提升，且破裂形式由穿晶斷裂改變為沿晶斷裂。AZ91D經FSP改質後再於200ºC經24小時之人工時效可達到最佳析出強化效果，其硬度值及抗拉強度皆顯著獲得提升。ZA113經FSP改質後的塊狀之τ相被均勻分散，SZ區具有顯著晶粒細化效應並發現微細晶粒及緻密之組織，由於晶粒細化及分散之化合物導致SZ區硬度值得到提升，此外FSP過程之摩擦熱及塑性流導致相組成改變並出現準晶Q相。拉伸性質方面破裂形式由塊狀之穿晶斷裂改變為第二相圍繞在晶界上之沿晶斷裂，但由於塑性流不均勻造成之孔洞使得抗拉強度略為下降。

The aim of present study is to investigate the effect of friction stir processing (FSP) on the variation of microstructural feature, texture, hardness, tensile properties and fracture behaviors of commercial AZ91D and ZA113 magnesium alloys with different Zn/Al ratio. Experimental results show that significant grain refinement of AZ91D can be achieved by the FSP modification. Coarse γ-phase particles are refined and uniformly dispersed on the grain boundaries. The increasing microhardness within the stir zone (SZ) is resulted from the solid solution effect during FSP. The improvement of yield strength and tensile strength can be resulted from the grain refining and the dispersion strengthening effects. The microhardness and tensile strength of AZ91-FSP specimens are both significantly enhanced after heating at 200ºC, held for 24 h artificial aging treatment. The τ-phase in ZA113 magnesium alloy is also uniformly dispersed and refined after FSP modification. The microhardness is increased because of the grain refining and particle dispersion effects within the SZ. After the FSP modification process, the quasi-crystal Q-phase is observed in the SZ of ZA113-FSP specimens. The tensile strength is slightly decrease due to the pores occurred from plastic instability in the SZ. The fracture surface shows an intergranular fracture feature for the ZA113-FSP specimens.

目錄
中文摘要 …………………………………………………………... i
英文摘要
誌謝 ……………………………………………………….....
…………………………………………………………... ii
iii
目錄 ………………………………………………………....... iv
表目錄 …………………………………………………………... vi
圖目錄 …………………………………………………………... vii
第一章 前言……………………………………………...…….... 1
第二章 文獻回顧……………………………...………………… 2
2-1 鎂合金添加元素之效應………………………………... 2
2-2 摩擦攪拌製程(Friction Stir Processing, FSP)………….. 3
2-3 準晶之結晶特徵……………………………………….. 4
2-4 鎂合金變形之機制………………….............................. 4
2-5 鎂合金發展現況………………………………………... 5
第三章 實驗內容與方法………………………………………... 14
3-1 實驗材料及成分分析…………………………………... 14
3-2 摩擦攪拌製程(Friction Stir Processing, FSP)………….. 14
3-3 微觀組織解析…………………………………………... 14
3-3-1 金相組織觀察…………………………………………... 14
3-3-2 SEM組織觀察及EDS成分分析.................................... 15
3-3-3 微電子探測儀定性分析(EPMA) ……............................ 15
3-3-4 TEM微觀組織分析……………………………………. 15
3-4 相組成與織構分析………………………..……………. 15
3-4-1 XRD相組成分析…..…………………………................ 15
3-4-2 DSC熱分析……………………………………………... 15
3-4-3 EBSD織構分析…………………………………………. 16
3-4-4 Pole figure織構分析……………………………………. 16
3-5 機械性質測試…………………………………………... 16
3-5-1 硬度分佈量測…………………………………………... 16
3-5-2 拉伸試驗………………………………………………... 16
3-5-3 拉伸破斷面觀察與分析………………………………... 16
第四章 實驗結果與討論..………………………………………. 22
4-1 AZ91D合金之摩擦攪拌改質效應……………………... 22
4-1-1 金相組織觀察…………………...……………………… 22
4-1-2 SEM微觀組織觀察及EDS元素分析………………….. 22
4-1-3 EPMA定性分析………………………………………... 23
4-1-4 XRD相組成及織構分析……..………………………… 23
4-1-5 微小硬度及人工時效硬度測試………………………... 24
4-1-6 拉伸機械性質分析……………………………………... 24
4-1-7 拉伸破斷面與次表面觀察……………………………... 24
4-2 ZA113合金之摩擦攪拌改質效應……………………... 26
4-2-1 DSC分析………………………………………….......... 26
4-2-2 金相組織觀察…………………………………………... 26
4-2-3 SEM微觀組織觀察及EDS元素分析……………….... 26
4-2-4 TEM微觀組織分析……..……………………………… 27
4-2-5 EPMA定性分析………………………………………… 27
4-2-6 XRD相組成分析……………………………………….. 28
4-2-7 EBSD與Pole figure織構分析………………………….. 28
4-2-8 微小硬度測試…………………………………………... 28
4-2-9 拉伸性質分析…………………………………………... 28
4-2-10 拉伸破斷面、次表面觀察……………………………... 29
4-3 摩擦攪拌改質效應對AZ91D及ZA113之影響……….. 29
第五章 結論..……………………………………………………. 64
參考文獻 …………………………………………………………... 65
英文論文大綱 …………………………………………………………... 68
簡歷 …………………………………………………………... 72

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