添加Al2O3之6061鋁基複合材料製程研究

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姓名

吳建興(Jian-sing Wu) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

添加Al2O3之6061鋁基複合材料製程研究
(Mechanical Behavior in 0~20wt% Al2O3 Particle Reinforced 6061 Al Matrix Composite)

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摘要(中)

本研究計畫探討特殊鋁基複合材料製程研究。選取鋁合金6XXX系中6061鋁基複合材料添加10wt%Al2O3、15wt%Al2O3、20wt%Al2O3三種不同Al2O3含量為研究對象，經由不同條件的T6熱處理程序並進行機械性質、磨耗試驗及顯微組織觀察，探討添加Al2O3顆粒對其材料性質之影響。並期望其能提升6XXX系鋁合金之材料強度並增加其應用的廣泛性。
由實驗結果顯示：添加Al2O3顆粒之6061鋁基複合材料經T6處理(510℃固溶處理4hr+175℃時效處理8hr)後，在冷輥軋20%下，三種不同Al2O3含量6061鋁基復材的抗拉強度在340MPa以上(添加10wt% Al2O3=>343 MPa、15wt%Al2O3=>352MPa、20wt%Al2O3=>356MPa)且延伸率在6%以上(添加10wt%Al2O3=>7.4%、15wt%Al2O3=>6.4%、20wt%Al2O3 =>7.4%)。
在磨耗試驗部份6061鋁基複材經軋延80%後比之未經軋延6061鋁基擠製材，其耐磨耗性有明顯的改善，輥軋所產生之加工硬化對材料的耐磨耗性有所影響。若外加T6處理，熱輥軋10wt%Al2O3與15wt%Al2O3之6061鋁基複材耐磨耗性有略微改善而20wt%Al2O3之6061鋁基複材則改善較多。相同輥軋率80%，經冷輥軋的耐磨耗性在Al2O3顆粒含量10wt%Al2O3與15wt% Al2O3之6061鋁基複材比熱
軋延改善較多，但20wt%Al2O3之6061鋁基複材則沒有改善且與熱軋延之耐磨耗性相當，研判可能是因為經熱軋延80%的20wt%Al2O3 /6061鋁基複材在磨耗時，磨屑沒被排除接著又因磨耗時摩擦所產生的熱能，將磨屑與試片表面熔接在一起，導致重量損失有誤差因而產生此結果。本研究中磨耗性在參數為冷輥軋80%後經T6處理下之添加Al2O3顆粒6061鋁基複材(添加10wt%Al2O3=>1.03×10-7 mm3/ Nm、15wt%Al2O3=>0.66×10-7 mm3/Nm、20wt%Al2O3 =>0.6×10-7 mm3/ Nm)為最佳。

摘要(英)

There are 0~20 wt% Al2O3 particle reinforced 6061 Al matrix composite in our research. They were rolling reductions of 20, 40, 60, 80% rolling process and artificial aging at temperature 175℃ that in order to discuss precipitation affect in the materials, followed by an extrusion for plates. Furthermore, the strain rate effects on the tensile properties and wear properties are discussed.
For the four tested materials: unreinforced 6061-T6 aluminum alloy, 10wt%, 15wt%, and 20wt% Al2O3 /6061-T6 composites, the cool rolling 20% of tensile strength over 340MPa and strain rate over 6%.
The wear properties and wear mechanisms of alumina particulate (Al2O3) reinforced 6061-T6 aluminum alloy matrix composites were investigated. Composites of different alumna contents (10, 15, 20wt%) were tested for their at room temperature with an Schwingung Reibung Verschleiss (SRV) oscillation friction wear tester under 25N load. the results show that the wear volume of different composite specimens decreases with increasing alumina particulate contents, it can be modeled by the inverse rule of mixtures. The wear resistance of the composite is better than the unreinforced alloy.

關鍵字(中)

★ 6061鋁基複合材料

關鍵字(英)

★ 6061 Al matrix composite

論文目次

摘要
總目錄 I
表目錄 IV
圖目錄 V
二、文獻回顧 3
2-1複合材料簡介 3
2-2鋁基複合材料 4
2-3 Al2O3對鋁合金的影響 5
2-4 6061鋁合金 5
2-5時效硬化 5
2-5-1時效硬化流程 5
2-5-2析出硬化機構 8
2-6鋁合金之晶粒細化 11
2-7金屬材料再結晶理論 12
2-7-1冷作加工儲存能 12
2-7-2儲存能的釋出及再結晶驅動力 12
2-7-3再結晶晶粒尺寸 13
2-8磨耗介紹 14
2-8-1影響耐磨耗性的因素 16
2-8-2磨耗注意事項 17
三、實驗方法與步驟 22
3-1合金軋延 22
3-2金相顯微組織觀察 22
3-3 T6處理 23
3-4硬度試驗 24
3-5拉伸試驗 24
3-6磨耗試驗 25
3-7實驗流程圖 27
四、結果與討論 32
4-1光學顯微鏡組織 32
4-1-1擠製後金相組織 32
4-1-2冷軋後金相組織觀察 33
4-1-3熱軋後金相組織觀察 34
4-2 SEM顯微組織分析 34
4-3 T6處理後硬度分析 35
4-4拉伸試驗結果 37
4-4-1輥軋率的不同 37
4-4-2時效時間的不同 38
4-4-3 Al2O3含量的不同 39
4-5磨耗試驗結果 39
五、結論 80
六、參考文獻： 82

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指導教授

李雄(Shyong Lee)

審核日期

2009-7-6

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