Cu含量對Al-12.5Si-1.0Mg合金熱穩定性與磨耗性質之影響

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潘韋龍(Wei-long Pan) 查詢紙本館藏

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機械工程學系

論文名稱

Cu含量對Al-12.5Si-1.0Mg合金熱穩定性與磨耗性質之影響
(Effect of Cu content on the thermal stability and wear behavior of Al-12.5Si-1.0Mg alloy)

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摘要(中)

本研究在探討含Cu之Al-12.5Si-1.0Mg合金之高溫（300℃）熱穩定性與耐磨性。結果顯示，低Cu（2.55wt.%）合金之鑄態微結構包括鋁矽共晶相、Al2Cu相(θ)、Al5Cu2Mg8Si6相(λ)及Mg2Si相(β)，而高Cu（4.53wt.%）合金之鑄態微結構除了未觀察到Mg2Si相(β)外，其餘組成與低Cu合金相似。合金經固溶處理後，高Cu合金鋁基地中的Cu原子固溶量比低Cu合金高，時效處理後，析出大量Al2Cu相(θ)、Al5Cu2Mg8Si6相(λ)，提升合金之硬度。高Cu合金於鑄態時，鋁基地中晶出大量Al2Cu相與Al5Cu2Mg8Si6相，而此晶出相經300℃×10hr處理後仍然存在於鋁基地中，致使合金硬度下降幅度減少（約HRF89→HRF75），熱穩定性良好。而時效處理後之合金雖有析出相提升合金硬度，但析出相經300℃×10hr後會產生明顯過時效現象，致使合金硬度大幅下降（約HRF104→HRF57），熱穩定性不如鑄態合金。在低荷重（10N）進行磨耗時，含高低Cu之鑄態與時效處理後之合金，經300℃×100hr處理後之磨耗量相似；但在高荷重（40N）時，合金耐磨性之趨勢與硬度相符，鑄態高Cu合金經300℃×100hr處理後硬度最高，具有最佳耐磨性。

摘要(英)

Effect of Cu content on microstructure and mechanical properties of Al-12.5Si-1.0Mg alloys were investigated by adding two kinds of Cu contents (2.55wt.%, 4.53wt.%) into the alloys. The results indicate that microstructural constituents of low-Cu alloys consist of eutectic Al-Si, Al2Cu, Al5Cu2Mg8Si6 and Mg2Si coexist at the Al-matrix. Increasing the Cu content will reduce Mg2Si but increase Al2Cu and Al5Cu2Mg8Si6. Effect of soluting atoms and precipitation hardening increases with the increasing of Cu content, this leads to higher hardness in high-Cu alloys. But the precipitation phase change from coherence or semi-coherence to non- coherence, and the hardness of alloys will decline. The foundry high-Cu alloys after 300℃×100hr treatment contains much intermetallic compounds and shows the best thermal stability. After wear test with 10N load, each alloy shows the same wear rate. When load is 40N, the foundry high-Cu alloy after 300℃×100hr treatment shows the lowest wear rate.

關鍵字(中)

★ Al-12.5Si-1.0Mg合金
★ 磨耗性
★ Cu含量
★ Al2Cu相
★ 熱穩定性

關鍵字(英)

★ Al-12.5Si-1.0Mg alloys
★ Cu concent
★ Thermal stability
★ Al2Cu phase
★ Wear behavior

論文目次

總目錄
中文摘要 i
英文摘要 ii
總目錄 iii
圖目錄 v
表目錄 vi
一、前言與文獻回顧................................1
1.1 共晶鋁矽合金簡介..............................1
1.2 Al-Si-Cu-Mg合金之介金屬化合物.................4
1.3 Cu含量對Al-Si-Cu-Mg合金之影響.................6
1.4 研究背景與目的...............................11
二、實驗步驟與方式...............................12
2.1 合金配置與熱處理.............................13
2.1.1 合金配製及成份分析.........................13
2.1.2 熱處理.....................................13
2.2微結構分析....................................14
2.2.1 OM金相觀察.................................14
2.2.2 電子微探儀分析(EPMA).......................14
2.2.3 熱差掃瞄分析(DSC)..........................14
2.2.4 導電度分析(%IACS)..........................15
2.2.5 掃瞄式電子顯微鏡(SEM)......................15
2.3 機械性質分析.................................15
2.3.1 硬度試驗...................................15
2.3.2 磨耗試驗...................................15
三、結果與討論...................................17
3.1 微結構分析...................................17
3.1.1 金相觀察及電子微探儀分析...................17
3.1.2 微分掃瞄熱分析(DSC)........................22
3.1.3 導電度(%IACS)分析..........................28
3.2 機械性質.....................................31
3.2.1 硬度試驗...................................31
3.2.2 磨耗試驗...................................35
四、結論.........................................40
五、未來研究方向.................................42
六、參考文獻.....................................43

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指導教授

李勝隆(Sheng-long Lee)

審核日期

2007-7-17

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