等通道轉角擠型製程對含Sc之Al-Mg合金微結構及機械性質之影響

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沈杰倫(Jie-Lun Shen) 查詢紙本館藏

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論文名稱

等通道轉角擠型製程對含Sc之Al-Mg合金微結構及機械性質之影響

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摘要(中)

等通道轉角擠型(ECAE)製程具有許多優點，擠製時可旋轉角度來控制材料之變形結構，而經由多次擠製可使材料的塑性變形量達到相當大的程度，且擠製後之材料截面積不會改變，同時亦可獲得均勻且細晶之材料結構。於鋁合金中添加Sc元素能有效細化晶粒及提升合金再結晶溫度，且Al3Sc相於高溫下能有效使晶粒保持細小且穩定之結構。
本研究利用等通道轉角擠型(ECAE)製程對不同Sc含量之Al-5Mg-0.7Mn合金進行擠製，藉以瞭解ECAE製程與Sc含量(0wt.%、0.3wt.%、0.58wt.%)對合金微結構及機械性質之影響，並觀察不同溫度下進行退火處理後之微結構穩定性及其影響程度，且對擠型後之細晶材料進行高溫拉伸測試，評估其超塑性表現。
實驗結果指出，添加0.3wt.%Sc即可使鑄態Al-5Mg-0.7Mn合金晶粒細化，而合金強度因細晶強化作用而提升。於300℃下進行ECAE Route BC之方式擠型，可使合金達到細化效果且獲得均勻之微結構，而合金內部極易發生動態回復作用，使得加工硬化率下降。鑄造晶出之Al3Sc相於高溫下能有效阻止晶界移動，提升合金再結晶溫度，此有助於提升合金之高溫延伸率。於450℃下以1×10-2S-1及5×10-2S-1速率進行拉伸，含Sc之合金延伸率皆可達300%以上。

關鍵字(中)

★ 等通道轉角擠型
★ Sc含量
★ 動態回復
★ 再結晶

關鍵字(英)

★ recrystallization
★ Sc content
★ equal-channel-angular-extrusion
★ dynamic recovery

論文目次

摘要………………………………………………………………… Ⅰ
謝誌………………………………………………………………… Ⅱ
總目錄…………………………………………………………….. Ⅲ
圖目錄…………………………………………………………….. Ⅴ
表目錄…………………………………………………………….. Ⅶ
壹、前言…………………………………………………………… 1
一、Al-Mg合金簡介……..………………………………….. 1
二、Sc對鋁合金之影響………………...…………………… 1
三、加工方式…………………………...……………………. 5
四、超塑性………………………………………………..….. 11
五、實驗目的與設計………………………………………… 13
貳、實驗步驟與方法……………………………………………… 15
一、鑄造、擠型與退火處理..……………………………….. 15
1.合金配製及成分分析……………………………………. 15
2.等通道轉角擠型(ECAE)………………………………… 15
3.退火處理…………………………………………………. 17
二、微結構分析…………..………………………………….. 19
1 OM金相觀察……………………………………………… 19
2.穿透式電子顯微鏡觀察(TEM)….………………………. 19
3.導電度量測(IACS%).……………………………………. 19
三、機械性質分析…………………………………………… 21
1.微硬度試驗……………………………….………..…….. 21
2.常溫拉伸試驗…………………………….……………… 21
3.高溫拉伸試驗……….……………………………..…….. 21
參、結果與討論…………………………………………………… 23
一、微結構分析……………………………………………… 23
1.鑄態及ECAE金相觀察…………………………….……. 23
1.1 OM金相觀察………………………………………… 23
1.2穿透式電子顯微鏡觀察(TEM)……………………... 29
1.3導電度量測(IACS%)………………………………... 33
2.退火金相觀察……………………………………………. 33
二、機械性質分析………………………….………………... 42
1.硬度試驗…………………………………………………. 42
1.1鑄態及ECAE擠型…………………………………. 42
1.2退火處理……………………………………………. 44
2.常溫拉伸試驗……………………………………………. 46
3.高溫拉伸試驗……………………………………………. 46
肆、結論…………………………………………………………….54
伍、未來研究方向………………………………………………… 55
陸、參考資料……………………………………………………… 56

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2005-7-14

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