時效對AA2024高強度鋁合金機械與腐蝕特性之影響

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姓名

楊承得(Cheng-De Yang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

時效對AA2024高強度鋁合金機械與腐蝕特性之影響
(Effect of aging on the mechanical and corrosion properties of AA2024 high strength aluminum alloys)

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摘要(中)

本研究以光學顯微鏡(OM)、差式掃描熱分析儀(DSC)、導電度量測(%IACS)、電子顯微鏡(TEM、SEM)、硬度量測(HRB)、拉伸試驗(MTS)、慢應變速率拉伸試驗(SSRT)、剝落腐蝕(EXCO)等量測分析，來探討時效製程(自然時效與人工時效)對固溶淬火後之AA2024(Al-4.4Cu-1.5Mg)高強度鋁合金應力腐蝕與剝落腐蝕之影響；結果顯示，在T6態與T7態狀況下，合金之導電度、機械性質、剝落腐蝕與應力腐蝕等並不受自然時效的影響，然而T7態相較T6態具有明顯提升抗剝落腐蝕與應力腐蝕的效果，其剝落腐蝕深度由T6態的480μm，大幅降至T7態的220μm。而慢應變速率拉伸下的延性損失率，顯示合金抗應力腐蝕由T6態的70%，降至T7態的34%，這些結果均顯現自然時效對AA2024合金的機械性質與抗腐蝕性並無顯著的影響，但經T7熱處理後，合金之抗腐蝕能力明顯優於T6態合金。

摘要(英)

In this study, optical microscope (OM), differential scanning thermal analyzer (DSC), conductivity measurement (%IACS), electron microscope (TEM, SEM), hardness measurement (HRB), tensile test (MTS), slow strain rate tensile test (SSRT), exfoliation corrosion (EXCO) and other measurement analysis to discuss the aging process (natural aging and artificial aging) on the influence of stress corrosion and exfoliation corrosion of AA2024 (Al-4.4Cu-1.5Mg) high strength aluminum alloys after solution quenching; the results show that in the T6 state and T7 state, the electrical conductivity, mechanical properties, exfoliation corrosion and stress corrosion of the alloy are not affected by natural aging, but the T7 state is compared to the T6 state, it can obviously improve the effect of anti-exfoliation corrosion and anti-stress corrosion, and the depth of exfoliation corrosion is greatly reduced from 480μm in T6 state to 220μm in T7 state. In the slow strain rate tensile test, the ductility loss rate of stress corrosion resistance of the alloy decreased from 70% in the T6 state to 34% in the T7 state. These results show that natural aging has no significant effect on the mechanical properties and corrosion resistance of the AA2024 alloy, but after T7 heat treatment, the corrosion resistance of the alloy is significantly better than T6 alloy.

關鍵字(中)

★ Al-Cu-Mg合金
★ 自然時效
★ 人工時效
★ 拉伸試驗
★ 應力腐蝕
★ 剝落腐蝕

關鍵字(英)

★ Al-Cu-Mg alloy
★ Natural aging
★ Artificial aging
★ SSRT
★ SCC
★ EXCO

論文目次

摘要..........i
Abstract.....ii
謝誌.........iii
總目錄........iv
圖目錄.......vii
表目錄........ix
一、前言與文獻回顧...1
1.1鋁合金簡介.......1
1.2 AA2024鋁合金簡介......2
1.3時效處理對Al-Cu-Mg合金機械性質與微結構之影響.....3
1.4時效處理對高強度鋁合金腐蝕破壞之影響.............5
1.4.1時效處理對Al-Zn-Mg-Cu合金抗腐蝕性之影響.......6
1.4.2時效處理對Al-Cu-Mg合金抗腐蝕性之影響..........7
1.5研究目的........11
二、實驗方法與步驟........12
2.1合金熔配與實驗流程.....12
2.2均質化與熱加工........13
2.3人工時效熱處理........13
2.4微結構觀察與分析......14
2.4.1光學顯微鏡(Optical Microscopy, OM)....14
2.4.2差式掃描熱量法(Differential Scanning Calorimetry, DSC)......................................14
2.4.3導電度測試(Electrical Conductivity)...14
2.4.4掃描式電子顯微鏡(Scanning Electron Microscopy, SEM)......................................15
2.4.5穿透式電子顯微鏡(Transmission Electron Microscopy, TEM)......................................15
2.5機械性質分析...................15
2.5.1硬度試驗(Hardness, HRB)......15
2.5.2拉伸試驗(Tensile Test).......16
2.6腐蝕試驗..............16
2.6.1剝落腐蝕試驗........16
2.6.2慢應變速率拉伸試驗(Slow Strain Rate Test, SSRT)..17
三、結果與討論....18
3.1微觀結構分析....18
3.1.1 OM金相......18
3.1.2差式掃描熱量法(DSC)與導電度(%IACS)分析......19
3.1.3穿透式電子顯微鏡觀察(TEM).....22
3.2機械性質分析......24
3.2.1硬度...........24
3.2.2拉伸試驗........25
3.3腐蝕試驗{剝落腐蝕試驗(EXCO)、應力腐蝕試驗(SCC)}....26
3.4掃描式電子顯微鏡(SEM)破斷面觀察.......29
四、結論.....31
五、參考文獻.......32

參考文獻

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2020-7-22

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