博碩士論文 87323001 詳細資訊


姓名 高國瑜(Guo-Yu Gou)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 汽車車體骨架用6000系鋁合金低溫時效與擠型條件之研究
檔案 至系統瀏覽論文 (永不開放)
摘要(中) 實驗方法分為兩部份,第一部份是使用微差掃描熱分析(DSC)及電阻量測來研究合金的時效析出舉動,並配合穿透式電子顯微鏡(TEM)觀察合金析出強化相的分布情形,並以拉伸試驗(Tensile Test)來量測合金降伏強度及最大抗拉強度的高低。解析6063合金在經過預時效及高溫時效之後,強度不佳的原因。並期望能提出最佳的熱處理製程,使得材料在經過預時效及高溫時效後,能達到最佳的硬化能力。第二部份是利用Gleeble壓縮試驗及擠型最大壓力配合微差掃描熱分析(DSC)及穿透式電子顯微鏡觀察(TEM),評估合金元素、擠製溫度對熱變形抵抗的影響。
由實驗結果可知,6063合金經固溶處理.淬水,於40∼70℃進行長時間預時效時,基地內會有G.P.Zones(Π)及β′的核形成,其並不影響高溫人工時效時β′強化相的析出。並且,G.P.Zones(Π)的密度會因為預時效溫度的提升或時間的增長而增加。但在30℃下預時效時,基地內會產生G.P.Zones(I),其會抑制高溫人工時效時β′強化相的析出,對材料強度有負面影響。
另一方面,擠製溫度越高則材料的熱變形抵抗越小;添加Mg、Si、Fe等合金元素越多,則材料之熱變形抵抗越大。其中,以添加過量Mg的合金在擠製時的最大擠製壓力最高。相反的,添加微量的Mn可促進材料中β-AlFeSi相變態為α-AlFeSi相,降低合金之熱變形抵抗。
摘要(英) The results indicate that G.P.zones (II) of 6063 alloy is formed at 40 ~ 70℃ of pre-aging temperature and has no influence on age-harding after artificial aging, even in a long period. Increasing either the temperature or holding period of pre-aging will significantly increase the strength after artificial aging.
Second, the hot defotmation of AA6063 Al alloys has been related to chemical compositions, and the extrusion parameters including reheating temperature, container temperature, and extrusion rate. The extrudability was investigated using Gleeble compression test and the results were in good agreement with the actual extrusion test. The precipitation properties during extrusion were also measured using differential scanning calorimetry (DSC), and the microstructure observations were performed using and transmission electrion microscope (TEM).
The results indicate that higher extrusion temperature can obtain better extrudability. However, matreials with excess Mg, Si, and Fe elements will reduce extrudability. And the maximum extrusion pressure in Mg-excess material was greater than that in Si-excess material. In another hand, a small addition of Mn sifnificantly accelerates the homogenising process (transfoemation of the brittle platelike β-AlFeSi phase to the more rounded α-AlFeSi phase) which results in superior hot formabilitu and ductility.
關鍵字(中) ★ 擠製
★ 低溫時效
★ 熱變形抵抗
★ 鋁合金
關鍵字(英) ★ Al-Mg-Si
★ 6000
★ EXTRUSION
★ aging
論文目次 謝誌Ⅰ
AbstractⅡ
摘要Ⅳ
目錄Ⅴ
表目Ⅷ
圖目Ⅸ
第一章 緒論1
一、序言1
二、理論基礎與論文回顧2
2-1 Al-Mg-Si簡介2
2-2 Al-Mg-Si合金之析出強化熱處理3
2-3 Al-Mg-Si合金的時效硬化過程4
2-3-1 Al-Mg-Si合金的時效析出序列與機構4
2-3-2 Al-Mg-Si合金的兩段時效5
2-3-3 析出強化機構7
2-4 擠製條件對熱成形性之影響8
2-4-1 合金元素之影響8
2-4-2 擠製溫度之影響9
第二章 本文11
一、前言11
二、實驗步驟與方法13
2-1 材料13
2-2 不同預時效條件對人工時效時析出舉動之影響13
2-2-1 熱處理13
2-2-2 微差掃描熱分析
(Differential Scanning Calotimetry, DSC)14
2-2-3 拉伸試驗(Tensile Test)15
2-2-4 穿透式電子顯微鏡觀察(TEM)15
2-2-5 電阻值測試16
2-3 6063鋁合金之熱變形抵抗研究17
2-3-1 擠型製程17
2-3-2 突破壓力(Breakout Pressure)量測18
2-3-3 微差掃描熱分析
(Differential Scanning Calorimetry, DSC)18
2-3-4 拉伸試驗(Tensile Test)18
2-3-5 Gleeble壓縮試驗18
2-3-6 金相觀察19
2-3-7 穿透式電子顯微鏡觀察(TEM)
及成份分析(EDAX)19
三、結果與討論20
3-1 6063鋁合金經不同預時效條件對人工時效時
析出舉動之影響20
3-1-1 DSC量測的結果20
3-1-2 電阻量測的結果22
3-1-3 穿透式電子顯微鏡觀察的結果22
3-1-4 拉伸試驗的結果23
3-2 6063鋁合金之熱變形抵抗研究24
3-2-1 DSC量測的結果25
3-2-2 突破壓力(Breakout Pressure)量測26
3-2-3 拉伸試驗的結果27
3-2-4 電子顯微鏡觀察的結果27
3-2-5 合金配置對6063鋁合金熱變形抵抗的影響28
3-2-5.1 擠型性的調查結果28
3-2-5.2 Mn含量及均質化處理對6063鋁合金中
晶出相之影響29
四、結論31
五、參考文獻33
表37
圖39
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指導教授 歐炳隆(Bin-Lung Ou) 審核日期 2000-6-28

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