不同鍛造製程對AA2014鋁合金機械性質與抗腐蝕能力的影響

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姓名

杜建興(Jian-Xing Du) 查詢紙本館藏

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機械工程學系

論文名稱

不同鍛造製程對AA2014鋁合金機械性質與抗腐蝕能力的影響
(Factors affecting the microstructure, tensile properties and corrosion resistance of AA2014 forgings)

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至系統瀏覽論文 (2027-8-4以後開放)

摘要(中)

本論文所使用材料為 AA2014 高強度鋁合金的擠製棒材進行退火並使用不同
的鍛造條件(包括鍛造模具及鍛造溫度)，鍛造成型後進行固溶、淬水與時效處理
(T6)。研究目的在於探討不同鍛造溫度及鍛造縮減率等，對微結構組織產生的影響
包括二次相顆粒、動態再結晶、差排滑移、晶粒細化等，接著分析不同鍛造參數對
成型後鋁合金機械性質與抗腐蝕能力的影響。
AA2014 合金欲得到最高的降伏強度及極限抗拉強度，通常會採用 T6 頂時效
熱處理，但峰值時效熱處理會降低鋁合金的伸長率與韌性。鍛造製程有助於提高鋁
合金的強度及韌性，因此調查不同鍛造參數對性質的影響，可最佳化鋁合金強度及
韌性(toughness)，抗鹽水腐蝕能力，研發成果可提供給業界作為設計與製造高強度
鋁合金的技術資料。
實驗結果分析顯示，在 440°C 進行壓縮率 62%的鍛造，能得到最高的 YS(降
伏強度):503MPa，以及 UTS(最大抗強度):567MPa；而在使用常溫及低溫鍛造在後
續進行頂時效處理會增加單位面積上二次相顆粒的數量以及單位面積上 40-45°的
高角度晶界，導致抗腐蝕能力下降。

摘要(英)

Effects of different forging processes on the mechanical properties and corrosion
resistance of AA2014 aluminum alloys were investigated in this study. The AA2014
extruded bars were used to undergo annealing treatment and subject to different forging
processes (include different dies, forging temperatures and reduction ratios). Then, the
forged samples were removed to carry out solution treatment, water quenched and T6
artificial aging treatment. The target of this study is aiming to investigate the
microstructures of forged samples, including second phase particles, dynamic
recrystallization, dislocation tangling and grain refinement. In addition, the effect of
deformation on microstructure, mechanical properties and corrosion resistance would
also be investigated.
The high strength AA2xxx series aluminum alloys needs to obtain the highest yield
strength(YS) and ultimate tensile strength(UTS). Usually peck-aging T6 heat treatment
is used when using this alloy, but peck-aging heat treatment reduces the elongation and
toughness of aluminum alloy. Using the forging process could improve the strength and
toughness of aluminum alloy. The topics of this study is to assess the strength and
corrosion resistance of aluminum forgings (cold and hot forgings).
The analysis of the experimental results shows that the highest yield strength(YS):
503MPa and ultimate tensile strength(UTS): 567MPa can be obtained by forging at 440°C
with a compression rate of 62%; Aging treatment will increase the number of secondary
phase particles per unit area and high-angle grain boundaries of 40-45° per unit area,
resulting in a decrease in corrosion resistance.

關鍵字(中)

★ AA2014鍛造
★ 動態再結晶
★ 機械性質
★ 抗腐蝕能力

關鍵字(英)

★ AA2014 forging
★ dynamic recrystallization
★ mechanical properties
★ corrosion resistance

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章前言 1
第二章文獻回顧 2
2-1 AA2014鋁合金介紹 2
2-2 AA2014鋁合金不同成形方式之微結構差異 2
2-3 添加元素對鋁合金的性質與微結構影響 5
2-3-1 Cu元素的影響 5
2-3-2 鎂、錳元素的影響 5
2-4 製程參數對鋁材材質微結構影響 6
2-4-1 不同成型參數對基地殘留空孔影響 6
2-4-2 添加合金元素與空孔的結合能力 8
2-5 鋁合金塑型變形過程的微結構變化 9
2-5-1 回復(Recovery) 9
2-5-2 動態回復Dynamic recovery (DRV) 10
2-5-3 再結晶(Recrystallization) 10
2-5-4 動態再結晶Dynamic recrystallization (DRX) [18]-[20] 11
2-6 AA2014合金強化機制分析與討論 15
2-7 鋁合金的鹽水腐蝕 22
2-7-1 鋁銅合金鹽水腐蝕 22
2-7-2 二次相顆粒對AA2014合金鹽水腐蝕影響 23
第三章實驗方法與步驟 25
3-1 實驗材料 25
3-2 實驗用設備與觀測儀器介紹 25
3-3 實驗步驟 26
第四章結果與討論 31
4-1 不同鍛造參數對AA2014 鍛件機械影響(UTS、YS、TEL、韌性) 31
4-2 不同鍛造參數對AA2014 鍛件微結構的影響 33
4-2-1 不同鍛造參數對AA2014 鍛件光學顯微組織的分析 33
4-2-2 不同鍛造參數對AA2014 鍛件晶粒影響 43
4-2-3 不同鍛造參數對AA2014 鍛件析出物的影響 48
4-3 不同鍛造參數對鋁合金鍛件抗鹽水腐蝕能力影響 53
4-3-1 AA2014鋁合金鍛件抗鹽水腐蝕測試分析 53
4-3-2 不同鋁合金材料(AA2014、AA6066、AA7075)抗腐蝕能力 60
第五章結論 62
參考文獻 63

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指導教授

施登士(Teng-Shih Shih)

審核日期

2022-8-10

推文