鋅與銅對Al-Zn-Mg-Cu合金固溶溫度與淬火敏感性之影響

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杜坤庭(Kun-Ting Tu) 查詢紙本館藏

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機械工程學系

論文名稱

鋅與銅對Al-Zn-Mg-Cu合金固溶溫度與淬火敏感性之影響
(Effect of Zn and Cu on the solution temperature and quench sensitivity of Al-Zn-Mg-Cu alloys)

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摘要(中)

本研究藉由合金設計原理、機械性質及實際的熱處理驗證，透過光學顯微鏡(OM)、高溫熱示差掃描分析儀(HTDSC)、渦電流導電度計 (%IACS)、電子顯微鏡(TEM & SEM)等對微結構的分析，來探討合金元素對 Al-Zn-Mg-Cu 合金之固溶溫度與淬火敏感性之影響。
結果顯示，降低銅含量後，均質化處理將使 Al-Zn-Mg-Cu 合金之共晶相 T 相(Mg3Zn3Al2)與 η 相(MgZn2)均回溶於鋁基地，且不會析出低熔點(~495°C)的 S 相(Al2CuMg)，因此提高了合金之固溶溫度，增加合金固溶熱處理之效率;另外藉由提高合金之鋅含量，以增加強化相 η′ (MgZn2)之析出量，來彌補因 Cu 降低所減損合金之機械強度，結果顯示鋅原子不但可以提升合金強度外，對於合金延性也沒有不良減損，且可以與 Zr 原子加成改善合金之淬火敏感性。

摘要(英)

Based on the principle of design, mechanical properties and heat treatment of the alloy, and by using the optical microscope (OM), the high temperature differential scanning calorimetry (HTDSC), the electrical conductivity meter (% IACS), and the electron microscope (TEM & SEM) to analyze the microstructure of the alloy. In order to explore the impact the alloy has on the Al-Zn-Mg-Cu alloy solution temperature and quenching sensitivity.
The results show that the eutectic T phase (Mg3Zn3Al2) and the η phase (MgZn2) of the Al-Zn-Mg-Cu alloy are homogeneously dissolved in the aluminum matrix and doesn’t precipitate the low melting point’s S phase (Al2CuMg) after the copper content is reduced. Thus, increases the solution temperature of the alloy and improves the efficiency of the solution heat treatment. By increasing the zinc content of the alloy to increase the precipitation amount of the strengthening phase η′(MgZn2) to compensate for the reduction of the mechanical strength of the reduced alloy due to copper. The results show that the zinc atom not only improves the strength of the alloy, but also has no damage to the ductility of the alloy, and can improve the quenching sensitivity of the alloy with the addition of zirconium atom.

關鍵字(中)

★ 固溶溫度
★ 淬火敏感性
★ 機械性質

關鍵字(英)

★ Al-Zn-Mg-Cu
★ solution temperature
★ quenching sensitivity
★ mechanical properties

論文目次

摘要 I
Abstract II
總目錄 III
圖目錄 VI
表目錄 VIII
1 前言與文獻回顧 1
1.1 鋁合金特性簡介 2
1.1.1 鋁合金的強化機制 2
1.2 Al-Zn-Mg-Cu 簡介 5
1.2.1 Al-Zn-Mg-Cu 合金析出行為 6
1.2.2 AA7075 鋁合金簡介 10
1.3 元素添加對 Al-Zn-Mg-Cu 合金機械性質與淬火敏感性之影響 11
1.3.1 鋅(Zn)對合金機械性質之影響12
1.3.2 銅(Cu)對合金機械性質與固溶溫度之影響 13
1.3.3 鋯(Zr)對合金淬火敏感性之影響 16
1.4 研究之目的與實驗設計概述 18
2 實驗方法與步驟19
2.1 合金熔配 19
2.2 均質化處理 21
2.3 熱加工 21
2.4 熱處理 22
2.5 微結構觀察與分析 22
2.5.1 光學顯微鏡(Optical Microscopy, OM) 22
2.5.2 導電度測試 23
2.5.3 差式掃描熱量法(Differential Scanning Calorimetry,DSC) 23
2.5.4 掃描式電子顯微鏡(Scanning Electron Microscopy, SEM) 24
2.5.5 穿透式電子顯微鏡(Transmission Electron Microscopy,TEM) 24
2.6 機械性質分析 25
2.6.1 硬度試驗(Hardness, HRB) 25
2.6.2 拉伸試驗(Tensile Test) 25
2.6.3 Jominy 端面淬火試驗 26
3 結果與討論 27
3.1 微結構分析 27
3.1.1 金相觀察 27
3.1.2 穿透式電子顯微鏡(TEM) 29
3.1.3 導電度測試 33
3.1.4 差式掃描熱量法(DSC) 36
3.2 機械性質分析 38
3.2.1 硬度試驗 38
3.2.2 拉伸性質及破斷面形貌 41
3.2.3 Jominy 端面淬火試驗 46
4 結論 49
5 附錄:其他未來研究概述 50
6 參考文獻 51

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2017-7-31

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