微量鋯、鈧與退火溫度對Al-5Mg-0.7Mn合金再結晶、敏化腐蝕性與機械性質的影響

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劉育嘉(Yu-jia Liu) 查詢紙本館藏

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機械工程學系

論文名稱

微量鋯、鈧與退火溫度對Al-5Mg-0.7Mn合金再結晶、敏化腐蝕性與機械性質的影響
(Effect of Zr, Sc and annealing temperature on the recrystallization, sensitizied corrosion behavior and mechanical properties of Al Al-5Mg -0.7Mn alloy)

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摘要(中)

藉由光學顯微鏡(OM)、導電度(%IACS)、電子背向散射繞射(EBSD)、硝酸重量損失量測(ASTM G67)與機械性質量測，探討微量Zr (0.15wt%)、Sc (0.1wt%)與退火溫度，對AA5383（Al-5Mg-0.7Mn）合金之再結晶、抗敏化腐蝕、與機械與性質之影響。結果顯示，均質化過程中，因含微量Mn、Zr 與Sc 之合金，於晶粒內分別析出細小之MnAl4、Al3Zr與Al3Sc散佈相顆粒，有效阻礙再結晶、及晶粒成長，導致晶粒細化、及細晶強化；另外，微量Zr、Sc的添加，可提升合金之強度，其中又以退火溫度250℃時含Sc之合金強化效果最為顯著。低溫（250℃）退火時，合金發生部分再結晶，大部分仍屬織狀微結構，經敏化處理後，β相(Mg2Al3)會析出於晶界和次晶界上，此時合金具有較佳之抗敏化腐蝕能力，且因含Zr與Sc之合金，再結晶比例較含Mn合金低，所以含Zr與Sc之合金具有較佳耐腐蝕。當高溫（≥300℃）下退火，合金幾乎已經完全再結晶，導致抗敏化腐蝕能力的下降，晶粒愈細，抗蝕性愈低，此時，以含Mn合金有最佳之抗敏化腐蝕能力，含Sc合金則最低。當合金於高溫退火導致晶粒成長時，可略提升合金之抗敏化腐蝕能力。

摘要(英)

This study used microstructure observation, electrical conductivity (%IACS), electron backscatter diffraction (EBSD), electron microscope (SEM), nitric acid corrosion weight loss test, tensile test and hardness test (HRF), etc., to discuss the effects of Zr (0.15wt%)、Sc (0.1wt%), and annealing temperature on the recrystallization, corrosion and mechanical properties of Al-5Mg-0.7Mn alloy.
The results showed that the alloy containing minor of Zr (0.15wt%) and Sc (0.1wt%) will precipitate Al3Zr and Al3Sc dispersed phase particles in the grains during the homogenization process, which can increase the recrystallization temperature of the alloy and effectively. In addition, the addition of trace amounts of Zr and Sc can improve the strength of the alloy, and the strengthening effect of the alloy containing Sc is the most significant when the annealing temperature is 250 °C. When annealed at a low temperature (250 °C), the alloy is partially recrystallized, and most of it still has a textured microstructure. After sensitization treatment, the β(Mg2Al3) phase will precipitate discontinuously on the grain boundary and subgrain boundary. Therefore, the alloy has excellent resistance to sensitized corrosion. Because the recrystallization ratio of the alloy containing Zr and Sc is lower than that of the alloy containing Mn. The alloy containing Zr and Sc has better corrosion resistance.
When annealed at high temperature (≥300°C), the alloy is almost completely recrystallized, and the β phase will continuously precipitate on the grain boundary, resulting in a decrease in the alloy′s resistance to sensitized corrosion. The finer the grains, the lower the corrosion resistance. Therefore, the corrosion resistance of Mn-containing alloys is the best. The sensitized corrosion resistance of the alloy is slightly improved when grain growth is induced by annealing at a high temperaturessure.

關鍵字(中)

★ Al-Mg合金
★ AA5383
★ 製程退火
★ 再結晶
★ 機械性質
★ 敏化腐蝕性質

關鍵字(英)

★ Al-Mg alloy
★ AA5383
★ annealing
★ recrystalline
★ mechanical properties
★ sensitizied corrosion

論文目次

摘要 I
Abstract II
謝誌 IV
總目錄 V
圖目錄 VIII
表目錄 XI
壹、前言與文獻回顧 1
1.1鋁合金簡介 1
1.2 AA5383合金簡介 2
1.3鋁鎂合金強化機制 3
1.4添加金屬元素對鋁合金之影響 4
1.4.1鎂對鋁合金的影響 4
1.4.2添加微量錳(Manganese)對鋁合金的影響 6
1.4.3 添加微量鋯(Zirconium)對鋁合金的影響 7
1.4.4 添加微量鈧(Scandium)對鋁合金之影響 9
1.4.5 其他元素對鋁合金的影響 12
1.4.6 鐵對鋁合金之影響 12
1.4.7 矽對鋁合金之影響 12
1.5 退火溫度對鋁鎂合金機械性質與顯微結構之影響 13
1.5.1 回復 13
1.5.2 再結晶 13
1.5.3 晶粒成長 14
1.6鋁鎂合金之腐蝕與影響鋁鎂合金腐蝕性直之因素簡介 16
1.6.1鋁鎂合金之腐蝕機制 16
1.6.2 影響鋁鎂合金β相析出之影響 18
1.6.3 鎂含量對β相析出之影響 19
1.6.4 冷加工量對β相析之影響 20
1.6.5 敏化溫度與時間對β相析出之影響 22
1.6.6 退火溫度對β相析出之影響 23
1.7實驗動機與目的 24
貳、實驗步驟與方法 27
2.1 實驗目的及流程 27
2.2 熱軋與H18冷加工 28
2.3 顯微結構分析 29
2.3.1 光學顯微鏡 (Optical Microscopy) 29
2.3.2 掃描式電子顯微鏡(Scanning Electron Microscopy) 30
2.4 導電度量測 (Electrical Counductivity,%IACS) 30
2.5腐蝕性質分析 31
2.5.1 ASTM G67 Nitric Acid Mass Loss Test (NAMLT) 31
2.6機械性質分析 33
2.6.1硬度檢測(Hardness,HV) 33
2.6.2拉伸試驗(Tensile Test) 33
參、結果與討論 34
3.1微結構與再結晶分析 34
3.1.1 微結構分析 34
3.1.2再結晶微結構分析 36
3.1.3導電度分析 39
3.2腐蝕性質分析 41
3.2.1 敏化處理後β相析出形貌 41
3.2.2 ASTM G67 重量損失測試 43
3.3機械性質分析 48
肆、結論 51
伍、參考文獻 52

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2022-8-11

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