臺灣博碩士論文加值系統

本實驗對不同重量百分比組成的鋁和氧化鋁粉末及鋅粉末進行摩擦攪拌，得到鋁氧化鋁複合材料與鋁鋅合金。利用萬能試驗機來量測攪拌區的機械性質，用掃描式電子顯微鏡、穿透式電子顯微鏡和X-ray繞射儀觀察攪拌區的微結構和組成相。實驗條件固定走速為0.5mm/s，轉速分別為500rpm、550 rpm、700rpm、1500rpm與1500 rpm所製成的試片再做熱處理實驗。此外選用不同尺寸的工具頭大小(凸銷及肩部構成)搭配不同轉速去得到細晶尺寸材料，以進一步了解晶粒尺寸對鋁氧化鋁複合材料與鋁鋅合金經摩擦攪拌製程後的實驗結果。
本實驗藉由摩擦攪拌製程來使添加的氧化鋁可以均勻分布在鋁基材內，進而提升複合材料的機械強度，同時藉由分散率良好的氧化鋁顆粒來阻止差排移動使其在晶粒內部糾結而產生加工硬化行為進而提升細晶材料的均勻延展性。還可利用不同的實驗參數去得到不同的超細晶晶粒尺寸，去觀察晶粒相異尺寸對於加工硬化行為的影響程度。此外經摩擦攪拌製程後鋅會固溶到鋁基材內部，且製成的鋁鋅合金有不錯的延展性。添加越多含量的鋅(5wt.%-10wt.%-15wt%)對於不同晶粒尺寸的細晶(0.4μm-2μm)其延展性增幅效果會更加明顯。

Al-Al2O3 precipitated alloys and Al-Zn solid solution alloys fabricated by friction stir process are investigated in this study.
The mechanical specimen cutting from stir zone were tested by Instron machine. Micro-structure was observed by Scanning Electron Microscopy and Transmission Electron Microscopy. Phase composition was measured by X-ray diffraction. Different Grain sizes sample were obtained at condition with constant traverse speed of 1.0mm/s, different RPM(500rpm, 550rpm, 700rpm, 1500rpm and 1500rpm with subsequent annealing treatment) and pin shape. Mechanical properties and ductility improvement on grain size effect are discussed in this research.
In Al/Al2O3 composite materials, mechanical strength is enhanced by Al2O3 precipitation distributed homogeneously in Al matrix and ductility is improved simultaneously by increment of work hardening rate due to interaction between obstacles and dislocations.
In Al-Zn solid solution alloys, ductility enhancement takes place not only in refining grain sizes but also occurs obviously with different weight fraction of Zn addition.

總目錄
論文摘要……………………………………………………………………...I
總目錄 III
表目錄 VI
圖目錄 VII

論文摘要： I
第一章 前言 1
1.1 背景說明 1
1.2 研究動機及目的 4
第二章 文獻回顧 5
2.1利用摩擦攪拌製程來製造超細晶粒材料 5
2.1.1摩擦攪拌製程 5
2.1.2摩擦攪拌製程晶粒尺寸 6
2.2 Al-Zn合金之基本性質 6
2.2.1 Al-Zn合金之機械性質 7
2.3金屬基複合材料的機械性質 8
2.3.1由細顆粒之強化 8
2.3.2 Orowan強化和散佈強化 9
2.3.3加工強化 10
2.3.4晶界強化 11
第三章 實驗方法 13
3.1實驗材料成分與製備 13
3.1.1 微米級鋁粉及奈米級氧化鋁粉 13
3.1.2 實驗塊材製作 13
3.2 摩擦攪拌製程 14
3.2.1 工具頭及夾具 14
3.2.2 摩擦攪拌製程機器簡介 14
3.3 巨觀結構與微觀組織分析 14
3.3.1掃瞄式電子顯微鏡觀察試片的晶粒大小 14
3.3.2穿透式電子顯微鏡觀察試片的晶粒大小 15
3.3.3 X光繞射分析 15
3.4 機械性質量測 15
3.4.1 拉伸試驗 15
第四章 實驗結果與討論 16
4.1 晶粒大小 16
4.2 X光繞射分析 17
4.3 拉伸性質量測 17
4.3.1 應力應變 17
4.3.2 Grain尺度與Hall-Petch關係 20
4.3.3 Grain尺度與均勻延展性及總伸長率的關係 21
4.3.4固溶強化機制與散佈強化之機械性質比較 22
第五章 結論 23
第六章 參考文獻 25
第七章 表 29
第八章 圖 38

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