非破壞性檢測對含銀Al-4.6Cu-0.3Mg鑄造鋁合金微結構與機械性質之關係

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姓名

林冠翰(Guan-Han Lin) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

非破壞性檢測對含銀Al-4.6Cu-0.3Mg鑄造鋁合金微結構與機械性質之關係

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摘要(中)

藉由非破壞性檢測技術(導電度量測與超音波檢測)探討微量銀對Al-4.6Cu-0.3Mg合金之微結構與機械性質影響的關連性;結果顯示經T6時效熱處理，合金之機械性質（硬度與拉伸強度）均隨銀含量增加而升高，而延性則反之；而在銀含量低於0.9wt%時，強化相(Ω+θ′)之析出量隨著銀含量增加而上升，同樣的，合金之相對導電度與相對聲波速度也顯現相同之趨勢，其增幅與微結構、機械性質之變化趨勢吻合;顯示非破壞性檢測技術（導電度與超音波量測），能作為含銀量對Al-4.6Cu-0.3Mg合金之微結構與機械性質影響的有效評估方法，且導電度量測較超音波測量更能靈敏的偵測強化相之析出。

摘要(英)

With non-destructive testing technology (electrical conductivity and ultrasonic testing), explore the correlation between silver with the microstructure and mechanical properties of Al-4.6Cu-0.3Mg alloy; The results showed that the alloys after T6 aging treatment, the mechanical properties (hardness and tensile strength) were increased with silver. The amount of precipitation phase (Ω + θ ′) are increased with increasing silver content when silver is less than 0.9wt%, Similarly, the relative conductivity and relative ultrasonic speed show the consistent trend. Showing that non-destructive testing technology (conductivity and ultrasonic testing) can explore silver content of Al-4.6Cu-0.3Mg alloys with microstructure and mechanical properties. In addition, for the precipitation phase detection ,electrical conductivity measurement is more sensitive than ultrasound measurements.

關鍵字(中)

★ 非破壞性檢測
★ 鋁合金
★ 機械性質
★ 微結構
★ 導電度
★ 超音波

關鍵字(英)

★ non-destructive testing
★ aluminum alloy
★ mechanical properties
★ microstructure
★ conductivity
★ ultrasound

論文目次

摘要……………………………………………………………… i
Abstract ……………………………………………………… ii
謝誌 ……………………………………………………………… iii
總目錄…………………………………………………………… iv
圖目錄…………………………………………………………… vi
表目錄…………………………………………………………… viii

第一章前言與文獻回顧........................... 1
1.1 非破壞性檢測簡介.......................... 1
1.1.1 導電度檢測介紹.................... 1
1.1.2 超音波檢測介紹................... 4
1.2 鋁合金簡介.............................. 5
1.2.1 鋁合金分類....................... 6
1.3 Al-4.6Cu-0.3Mg鋁合金介紹............... 9
1.3.1 合金熱處理........................ 11
1.3.2 合金析出與強化機制.................... 13
1.4 最小平方迴歸法........................... 19
1.5 實驗動機與目的........................... 20

第二章實驗方法................................ 22
2.1 合金製作................................ 22
2.2 熱處理................................. 23
2.3 微結構觀察與分析........................ 24
2.3.1 光學顯微鏡............................. 24
2.3.2 掃描式電子顯微鏡.................. 24
2.3.3 熱差掃瞄分析....................... 24
2.4 機械性質試驗.......................... 25
2.4.1 硬度試驗.......................... 25
2.4.2 拉伸試驗.......................... 25
2.5 非破壞性檢測.......................... 25
2.5.1 導電度量測........................ 25
2.5.2 超音波檢測....................... 25

第三章實驗結果與討論.......................... 27
3.1 微結構分析.......................... 27
3.2 機械性質分析........................ 32
3.3 非破壞性檢測......................... 33
3.4 非破壞性檢測與微結構及機械性質之關係.... 37
3.4.1 非破壞性檢測與微結構之關係.......... 37
3.4.2 非破壞性檢測與機械性質之關係........ 38

第四章結論................................... 41

第五章未來工作與建議......................... 42

第六章參考資料............................... 43

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指導教授

李勝隆

審核日期

2014-7-15

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