潤滑劑與製程參數對Al-0.8Mg-0.5Si鋁合金擠壓鑄件的影響

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黃永森(Yung-Sen Huang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

潤滑劑與製程參數對Al-0.8Mg-0.5Si鋁合金擠壓鑄件的影響
(Effects of lubricant and processing parameters in squeeze casting Al-0.8Mg-0.5Si aluminum alloy)

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摘要(中)

本篇研究目的在討論不同的(潤滑劑、澆鑄溫度)製程參數下，利用擠壓鑄造方式得到Al- X Mg-Y Si(X：0.82~0.88wt%；Y：0.55~0.57wt%)鋁合金鑄件，並討論鑄件中微孔/介在物數目和氧化膜對於拉伸性質與疲勞性質的影響。
在拉伸性質方面，試棒在相同應變速率下，試棒中反應膜面積率越多對試棒的拉伸強度及延伸率的影響越嚴重。
在疲勞性質方面，分析兩種高低反覆應力的破壞模式與鑄件微結構改變的關係，並將反應膜面積率、介在物顆粒與疲勞曲線結合討論鑄件中微孔/介在物和氧化膜對疲勞壽命的影響。實驗結果顯示，存在於試棒表面附近的反應膜對疲勞壽命的影響較介在物顆粒的影響效果更為顯著。
擠壓鑄造Al-(0.82~0.88)Mg-(0.56~0.57)Si合金在使用石墨粉末作為潤滑劑與Die casting水性金屬模離型劑，在擠壓壓力為60MPa，澆鑄溫度750℃和模具溫度180~200℃的製程參數下可獲得較佳的機械性質。

摘要(英)

This study focus on the investigating of the effect of pore/particle counts and reaction films on the tensile & fatigue properties of squeeze casting. The material used in this study were Al-X Mg-Y Si(X：0.82~0.88wt%；Y：0.55~0.57wt%) alloys.
The tensile test was performed at the same strain rate(0.67mm/min). The reaction film plays an important role on the ultimate tensile strength and the elongation of samples. The ultimate tensile strength and elongation were decreased with the increasing the area fraction of reaction films trapped in castings.
For fatigue life cycles test, when the reaction film resides at the area near the surface of specimen readily to initiate crack, and the fatigue life cycles were greatly deteriorated.
The processing parameters for higher quality squeezed Al-X Mg-Y Si alloys pouring as temperature of 750℃,mold temperature 180~200℃ and squeeze pressure 60MPa,and using water base lubricant added with Graphite powder alory with die casting hydrophilic releasing agent.

關鍵字(中)

★ Al-Mg-Si鋁合金
★ 擠壓鑄造
★ 反應膜
★ 微孔/介在物

關鍵字(英)

★ Al-Mg-Si aluminum alloys
★ squeeze cast
★ reaction film
★ pore/particle

論文目次

中文摘要……………………………………………………………………………….i
Abstract………………………………………………………………………………..ii
總目錄………………………………………………………………………………...iii
表目錄………………………………………………………………………………....v
圖目錄………………………………………………………………………………...vi
第一章前言…………………………………………………………………………1
第二章文獻回顧……………………………………………………………………2
2-1擠壓鑄造法……………………………………………………………………2
2-2擠壓鑄造對於鋁鑄件的影響…………………………………………………3
2-2.1擠壓鑄造對熱傳導性的影響…………………………………………...3
2-2.2擠壓鑄造對健全度的影響……………………………………………...4
2-2.3擠壓鑄造對相平衡圖的影響…………………………………………...6
2-2.4壓力對偏析的影響…………………………………………...…………7
2-2.5擠壓鑄造對微結構的影響……………………………………………...7
2-2.6擠壓鑄造對熱處理的影響……………………………………………...8
2-3拉伸試驗………………………………………………………………………8
2-3.1萬能拉伸試驗機………………………………………………………...8
2-3.2拉伸試驗應力分析……………………………………………………...8
2-3.3真應力-真應變曲線……………………………………………………..9
2-4高週疲勞試驗………………………………………………………………..10
2-4.1疲勞破壞……………………………………………………………….10
2-4.2疲勞破壞之形貌特徵………………………………………………….10
2-4.3旋轉樑疲勞試驗機原理……………………………………………….11
2-4.4疲勞應力分析………………………………………………………….11
2-5韋伯分布在工程上的應用………………………………………………13
第三章實驗方法與步驟…………………………………………………………..26
3-1實驗材料……………………………………………………………………..26
3-2實驗設備……………………………………………………………………..26
3-3實驗步驟……………………………………………………………………..27
3-4實驗參數設定…………………………………………….………………….29
第四章結果與討論………………………………………………………………..37
4-1 Al-Mg-Si鋁合金擠壓鑄件分析……………………………………………..37
4-1.1 Al-Mg-Si鋁合金擠壓鑄件微結構…………………………………….37
4-1.2 Al-Mg-Si擠壓鑄件氧化膜分析…………………………………….…38
4-1.3 Al-Mg-Si鋁合金擠壓鑄件微孔/介在物數目…………………………38
4-2熱處理對Al-Mg-Si擠壓鑄件的影響……………………………………….39
4-3擠型6061鋁合金圓棒微結構特徵…………………………………………39
4-4 拉伸試驗結果分析………………………………………………………….40
4-4.1 Al-Mg-Si鋁合金拉伸性質…………………………………………….40
4-4.2 Al-Mg-Si鋁合金擠壓鑄件拉伸破斷分析…………………………….40
4-5 疲勞試驗結果分析………………………………………………………….41
4-5.1 Al-Mg-Si擠壓鑄件疲勞性質………………………………………….41
4-5.2 Al-Mg-Si擠壓鑄件疲勞裂縫起始…………………………………….42
4-5.3 Al-Mg-Si擠壓鑄件疲勞裂縫成長與裂縫分析……………………….43
4-6 微孔/介在物顆粒與反應膜對Al-Mg-Si擠壓鑄件的疲勞壽命影響……..44
4-7 Al-Mg-Si擠壓鑄件疲勞壽命預測………………………………………….45
第五章結論………………………………………………………………………..66
參考文獻……………………………………………………………………………..67

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指導教授

施登士(Teng-Shih Shih)

審核日期

2007-7-24

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