6061鋁合金於累進式背擠製成型研究

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姓名

鄭名翔(Ming-hsiang Cheng) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

6061鋁合金於累進式背擠製成型研究

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摘要(中)

由劇烈塑性變形(Severe plastic deformation, SPD)方法達到超細晶粒(Ultrafine-grained, UFG)材料已被廣泛研究，本文採取由Fatemi-Varzaneh[20]等人提出的累進式背擠製(Acumulative back extrusion, ABE)於室溫對6061鋁合金加工。透過實驗與模擬，搭配不同的沖頭比(Deformation ratio,DR)與內沖頭行程(Die stroke,DS)，並配合硬度、微觀結構與有限元素模擬分析，探討ABE擠製過程的機制，與不同實驗參數造成的效應。經由有限元素模擬分析與實驗結果比較獲得良好的一致性，DR與DS會影響材料加工硬化與硬度均勻程度的變化，而本研究中能夠產生奈米等級的晶粒，但大部分晶界仍保持在低角度，顯示在仍無法達到超細晶粒的要求。

摘要(英)

To reach the ultrafine-grained(UFG) material from severe plastic deformation(SPD) method has been widely investigated.The present work used the AA60
61 in the room temperture processing of accumulative back extrusion(ABE) that
was one of the SPD techniqus was originally proposed by Fatemi-Varzaneh[20].
To investigate the mechanics of the processing of the ABE using the experi-
ment and the finite element method(FEM) with different deformatio ratio(DR),
Die stroke(DS) and pass number.Then,the microhardness and the microstructure
were utilized to study with the effective strain(ES) and shear strain(ES). Compa
ring the FEM and experimental results showed good agreement in the ES conto-
ur and microhardness. The DR and DS both has the great effect in the mechanic-
al properties of the workpiece.Althrough the part the grain size has high ES thro-
ugh one to three pass all can reach the nanoscale in the microstructure result,the
most of grain boundaries still remained low anglar grain boundry.It means the high stacking fault energy of AA6061 through ABEed processing at room temp-
erture still can’t satisfied with the UFG.

關鍵字(中)

★ 6061
★ 擠製

關鍵字(英)

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 viii
圖目錄 ix
第一章緒論 1
1.1前言 1
1.2文獻回顧 3
1.2.1累進式背擠製 3
1.3研究目的與動機 7
第二章基本概要 8
2.1鋁合金簡介 8
2.2對於6061系列機械性質影響的合金成分 10
2.3超細晶粒(UFG) 11
2.4劇烈塑性變形 13
2.5電子背向繞射 14
2.6晶粒細化機制 16
2.6.1回復 16
2.6.2再結晶 18
2.6.3晶粒分割 21
第三章實驗設備與方法 23
3.1實驗設備 23
3.1.1累進式背擠製模具介紹 23
3.2實驗方法 23
3.2.1實驗參數 23
3.2.2試片材料 24
3.2.3熱處理 24
3.2.4潤滑條件 24
3.3實驗步驟 25
3.4實驗量測 26
3.4.1硬度試驗 26
3.4.2硬度均勻性指數 27
3.4.3拉伸試驗 28
3.4.4光學顯微鏡觀測(OM) 29
3.4.5電子背相散射繞射觀測(EBSD) 29
第四章實驗結果與討論 31
4.1 ABE製程成型機制探討 31
4.1.1概要 31
4.1.2有限元素模擬設定 31
4.1.3有限元素模擬分析 33
4.1.4模擬結果與OM觀測比較 39
4.2 ABE製程對硬度分布影響 41
4.2.1概要 41
4.2.2微硬度試驗分析 41
4.2.3實驗與模擬結果討論 45
4.3 ABE製程對微結構探討 48
4.3.1概要 48
4.3.2 OM觀測結果 48
4.3.3 EBSD觀測加工前胚料 48
4.3.4 EBSD觀測經ABE加工胚料 49
4.3.5 EBSD觀測經熱處後之加工胚料 50
第五章結論與建議 52
5.1結論 52
5.2建議 53
參考文獻 55
附件…………………………………………………………………………...111

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指導教授

葉維磬(Wei-ching Yeh)

審核日期

2015-7-30

推文