不同鍛造製程對AA7075機械性質與抗腐蝕能力的影響

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許赫驖(Ho-Tieh Hsu) 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AA7075機械性質與抗腐蝕能力的影響

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摘要(中)

本研究探討不同鍛造製程對7075鋁合金(AA7075)機械性質與抗腐蝕能力的影響。實驗中對退火後AA7075的擠製棒材使用不同的鍛造條件(鍛造壓縮率及鍛造溫度)，之後進行固溶、焠火以及時效處理(T73)，再將試棒按照ASTM-E8規範進行CNC加工，隨後進行拉伸試驗量測，進而分析不同鍛造溫度及變形量的條件下，材料微結構對機械性質的影響。
將拉伸試驗後的試棒縱剖後研磨、拋光並透過光學顯微鏡(OM)觀察試棒的微結構；後續利用影像分析軟體分析二次相顆粒的大小、數量及析出位置，探討二次相顆粒對於機械性質的影響。利用雙束聚焦離子顯微鏡(FIB)製備穿透式電子顯微鏡(TEM)試片，藉由能量色散X-射線光譜(EDX)分析析出物的成份，以及利用掃描式電子顯微鏡(SEM)的電子背向散射繞射分析儀(EBSD)，分析高低晶界角度比例。
實驗結果分析顯示，AA7075在不同鍛造溫度及變形量的條件下皆符合規範要求(UTS≥505 (Mpa)、YS≥435 (MPa)、TEL≥13%)。AA7075鍛件上高角度晶界長度增加會加速鍛件的腐蝕速率提高Icorr值。

摘要(英)

The effects of different forging processes on mechanical properties and corrosion resistance of AA7075 were investigated in this study. The annealed AA7075 extruded bars which were produced by different forging processes (forging temperature and reduction rate) processed the solution treatment, water quenched and T73 artificial aging treatment. The samples were machined to the tensile bars according to ASTM-E8 specification, and then the tensile bars were tested to get tensile properties to analyze the effects of different forging temperatures and reduction rates on mechanical properties and microstructures.
Finally, polished longitudinal sections of different samples were observed by the optic microscope (OM), scanning electron microscope (SEM), transmission micro-scope (TEM) to analyze of second phase particle particles, dispersoids and grain boundary angles.
Experimental results demonstrate that all AA7075 samples after different forging processes compliance with specification (UTS≥505 (Mpa)、YS≥435 (MPa)、TEL≥13%). Increasing the high misorientation angle grain boundary lengths (MAGBs) per unite area accelerated corrosion to lift up Icorr values.

關鍵字(中)

★ Al-Zn-Mg-Cu合金
★ 鍛造
★ 晶界角度
★ 機械性質
★ 抗腐蝕能力

關鍵字(英)

★ Al-Zn-Mg-Cu Alloy
★ forging
★ angle grain boundary
★ 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 Al-Zn-Mg-(Cu) 鋁合金介紹 2
2-2 Al-Zn-Mg-(Cu) 鋁合金析出物介紹 2
2-3 添加元素對鋁合金影響 6
2-3-1 Mg、Zn 6
2-3-2 Cu 6
2-3-3 稀有元素影響：鈦(Ti)、鋯(Zr) 6
2-4 添加元素在不同溫度下的擴散速率(在FCC鋁中) 8
2-5 熱處理介紹 9
2-6 回復(Recovery)、再結晶(Recrystallization)介紹[24] 11
2-6-1 回復(Recovery) 11
2-6-2 動態回復(Dynamic recovery) 11
2-6-3 再結晶(Recrystallization) 11
2-6-4 靜態再結晶(Static recrystallization, SRX) 12
2-6-5 動態再結晶(Dynamic recrystallization, DRX) 12
2-7 腐蝕 18
2-7-1 腐蝕方式 18
2-7-2 析出物對腐蝕的影響 20
2-8 無析出帶precipitate-free zones(PFZ) 21
第三章實驗方法與步驟 23
3-1 實驗材料 23
3-2 實驗用設備與儀器介紹 23
3-3 試棒尺寸與鍛造模具 26
第四章結果與討論 33
4-1 不同鍛造溫度與變形量對AA7075鍛件品質的影響 33
4-1-1 不同鍛造溫度與變形量對AA7075鍛件機械性質(UTS、YS、TEL、韌性) 33
4-1-2 不同鍛造溫度及變形量對AA7075鍛件二次相顆粒尺寸數量的影響 35
4-1-3 不同鍛造溫度與變形量對AA7075鍛件晶粒尺寸的影響 37
4-1-4 不同鍛造溫度與變形量對AA7075鍛件晶界角度的影響 39
4-1-5 不同鍛造溫度與變形量對AA7075鍛件析出物分析 48
4-1-6 不同鍛造溫度與變形量對AA7075鍛件抗腐蝕能力影響 50
第五章綜論 55
5-1 不同鍛造溫度與變形量對AA7075鍛件機械性質影響 55
5-2 不同鍛造溫度與變形量對AA7075鍛件微結構影響 55
5-3 不同鍛造溫度與變形量對AA7075鍛件晶界高低角度變化 55
5-4 不同鍛造溫度與變形量對AA7075鍛件晶粒及晶界影響 56
5-5 不同鍛造溫度與變形量對AA7075鍛件抗腐蝕能力影響 56
第六章結論 57
參考文獻 58
附錄一 64
附錄二 65
附錄三 69
附錄四 70

參考文獻

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指導教授

施登士(Teng-Shih Shih)

審核日期

2021-7-8

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