Cu/Mg比與熱處理對Al-Cu-Mg-Ag合金應力腐蝕性之影響

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莊雅傑(Ya-Chieh Chuang) 查詢紙本館藏

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機械工程學系

論文名稱

Cu/Mg比與熱處理對Al-Cu-Mg-Ag合金應力腐蝕性之影響

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摘要(中)

摘要
Al-Cu-Mg-Ag合金為一高強度鋁合金，隨著Cu/Mg比由大到小，強化機制由Ω及θ’相並重至Ω相為主要強化相，且當施行不同熱處理，晶界析出形態也跟著改變，應力腐蝕破裂是Al-Cu-Mg-Ag合金破裂的重要原因之一，其破壞性會隨著析出形態而改變，故本研究探討主題為Cu/Mg比與熱處理對Al-Cu-Mg-Ag合金應力腐蝕破裂之影響。
本研究設計不同Cu/Mg比(Cu/Mg重量比=4、8、19、29)之四種合金，施以不同的時效熱處理(T4、T6、T7、RRA)，探討在應力腐蝕環境之下，各種時效熱處理條件對應力腐蝕敏感性的影響。利用光學顯微鏡(OM)、掃描式電子顯微鏡(SEM)、穿透式電子顯微鏡(TEM)、微差掃描熱分析儀(DSC)、導電度(%IACS)、硬度試驗、拉伸試驗(Tensile Test)與慢應變速率試驗(SSRT)等方法，探討微結構的變化與材料機械性質與抗應力腐蝕敏感性之關係。再根據實驗結果，尋求一兼具高強度與高抗應力腐蝕破壞Al-Cu-Mg-Ag鋁合金的製造方法及合金成份設計。
由結果可知，Cu/Mg重量比=8、19在進行T6、T7與RRA時效熱處理後均擁有高強度，但其中以Cu/Mg重量比=19實施T7時效熱處理之抗應力腐蝕最為顯著；顯示出Mg含量越多，雖然使析出相分布更為細密，卻也造成晶界處陽極溶解效應越趨嚴重；而T7熱處理，晶界析出物粗大且不連續，也使得抗應力腐蝕破裂效果較T6、RRA佳。

關鍵字(中)

★ 熱處理
★ 應力腐蝕破裂

關鍵字(英)

★ stress corroson crack
★ Al-Cu-Mg-Ag

論文目次

總目錄
摘要.......................................................I
謝誌......................................................II
總目錄...................................................III
圖目錄.....................................................V
表目錄...................................................VII
一、前言...................................................1
1.1 Al-Cu-Mg-Ag合金簡介...................................1
1.2 Al-Cu-Mg-Ag合金之析出強化相...........................2
1.3 Cu/Mg比對Al-Cu-Mg-Ag合金析出強化相之影響..............3
1.4 應力腐蝕簡介..........................................3
1.5 Al-Cu-Mg-Ag合金之腐蝕形態.............................7
1.6 時效處理對抗應力腐蝕破裂之影響........................9
1.7 慢速率應變試驗法(Slow Strain Rate Test, SSRT).........9
二、實驗步驟與方法........................................12
2.1 合金配製之擠製及熱處理...............................12
2.2 微結構分析...........................................14
2.2.1 OM金相觀察及EPMA分析...............................14
2.2.2 掃瞄式電子顯微鏡(SEM)..............................14
2.2.3 穿透式電子顯微鏡(TEM)..............................14
2.2.4 微差掃瞄熱分析儀(DSC)..............................15
2.2.5 導電度(%IACS)......................................15
2.3 機械性質分析.........................................15
2.3.1 硬度試驗...........................................15
2.3.2 拉伸試驗...........................................15
三、結果與討論............................................17
3.1 微結構分析...........................................17
3.1.1 金相觀察...........................................17
3.1.2 導電度量測(%IACS)..................................17
3.1.3 微分掃瞄熱分析(DSC)................................24
3.1.4 TEM分析............................................28
3.2 機械性質與應力腐蝕分析...............................34
3.2.1 硬度量測...........................................34
3.2.2 拉伸試驗...........................................38
3.2.3 應力腐蝕試驗.......................................38
3.3 綜合分析.............................................45
四、結論..................................................48
五、未來研究方向..........................................50
六、參考資料..............................................51

參考文獻

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2002-7-14

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