鎂含量與安定化對5000系鋁鎂合金腐蝕與機械性質之影響

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姜信丞(Hsin-Cheng Chiang) 查詢紙本館藏

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機械工程學系

論文名稱

鎂含量與安定化對5000系鋁鎂合金腐蝕與機械性質之影響
(Effect of Mg Contents and Stabilization on the Corrosion and Mechanical Properties of 5XXX Series Aluminum Alloys)

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摘要(中)

藉由微結構觀察、腐蝕與機械性質之量測，探討鎂(3-6wt%)含量與安定化退火對5000系冷輥鋁鎂合金敏化之影響，結果顯示，冷輥合金與經安定化退火之冷輥合金，兩者均無β相之析出。合金經敏化處理後，冷輥態合金之晶界呈現明顯的β相析出與腐蝕，且隨著鎂含量的增加，析出愈明顯且連續;而經安定化退火，抑制了合金敏化現象的發生，除了高鎂合金外，並未顯現嚴重之β相沿晶析出與腐蝕。
鎂原子的添加，除了增加鋁鎂合金固溶強化效果外，也降低了合金的疊差能，拉伸變形時，合金將顯現高加工硬化速率，有效抑制頸縮的發生，導致鎂含量愈高時，合金之強度與延伸率就愈高。另外，敏化處理降低了合金之鎂原子固溶強化效應，但對於加工強化效應並沒有顯著影響，所以與敏化前之機械性質相比較，其變化率將隨鎂含量增高而增大。而經安定化退火對機械性質之影響，與敏化處理相反，安定化退火降低了合金之加工強化效應，但對於固溶強化效應並沒有
影響，所以其變化率與合金鎂原子含量關係不大。

摘要(英)

With microstructure observation,corrosion test and mechanical test,explore the effect of magnesium contents(3-6wt%) and stabilization on the sensitization of 5XXX series aluminum alloys.The result indicated that neither the alloys after cold rolling nor stabilization precipitate the β-phase.After sensitization,the alloys which cold-rolled appeared obvious precipitation of β-phase.The precipitation of β-phase increased when magnesium contents increased.And the stabilization inhabited the sensitization,it didn’t occur serious intergranular precipitation of β-phase
except for the high magnesium contents.
Addition of magnesium also lower the stacking fault energy of alloys,the alloys showed high rate of strain hardening which inhibited the occurence of necking.Therefore,alloys contains higher magnesium
contents resulting in higher strength and elongation.In addition,sensitization treatment weaken the effect of solution strength of magnesium atoms,but it didn’t affect the strain hardening.Thus,the rate of change increased with magnesium contents increased when compared to the mechanical properties before sensitization.In contrast, the effect of stabilization on the mechanical properties showed the oppsite results, sensitization weaken the effect of strain hardening,but it didn’t affect the solution strength,therefore,the rate of change is unrelated to magnesium contents of alloys.

關鍵字(中)

★ 鋁鎂合金
★ 鎂含量
★ 安定化退火
★ β相
★ 腐蝕性質
★ 機械性質

關鍵字(英)

論文目次

第一章總目錄
摘要.................................................. I
Abstract............................................. II
謝誌..................................................III
第一章總目錄........................................... IV
表目錄................................................VII
圖目錄...............................................VIII
一　前言................................................1
二　文獻回顧.............................................3
2.1 5000系鋁鎂合金簡介...................................3
2.2鎂(Mg)對5000系鋁鎂合金的影響...........................4
2.3錳(Mn)對5000系鋁鎂合金的影響...........................6
2.4其他微量元素對5000系鋁鎂合金的影響......................8
2.5鋁鎂合金沿晶腐蝕機制...................................8
2.6影響5000系鋁鎂合金腐蝕性質之因素 .......................10
2.6.1鎂含量對5000系鋁鎂合金腐蝕性質之影響.................10
2.6.2冷加工量對5000系鋁鎂合金腐蝕性質之影響...............10
2.6.3退火溫度對5000系鋁鎂合金腐蝕性質之影響...............12
2.6.4敏化溫度與時間對5000系鋁鎂合金腐蝕性質之影響..........13
2.7退火溫度對冷加工後5000系鋁鎂合金機械性質與微結構之影響 ......................................................15
2.8康式準則(Considere’s Criterion).....................16
三實驗步驟與方法.......................................19
3.1合金熔配與成分分析...................................19
3.2合金鍛造............................................21
3.3安定化退火與敏化處理.................................21
3.4微結構觀察與分析.....................................22
3.4.1光學顯微鏡(Optical Microscopy)....................22
3.4.2掃描式電子顯微鏡(Scanning Electron Microscopy) ......................................................23
3.4.3穿透式電子顯微鏡(Transmission Electron Misroscopy) ......................................................24
3.4.4導電度量測(Electrical Conductivity,%IACS).........24
3.5硝酸腐蝕重量損失測試：沿晶腐蝕敏感性分析(ASTM G67 Nitric Acid Mass Loss Test(NAMLT)[ASTM2]：)..................25
3.6機械性質分析........................................26
四　結果與討論.........................................28
4.1微結構分析..........................................28
4.1.1晶粒組織..........................................28
4.1.2冷輥合金之β相析出形貌 ..............................34
4.1.3安定化退火合金之β相析出形貌.........................37
4.1.4導電度檢測........................................42
4.2腐蝕性質分析........................................44
4.3機械性質分析........................................46
五　結論...............................................51
六　參考文獻...........................................52

第二章總目錄
摘要..................................................I
Abstract.............................................III
第二章總目錄...........................................IV
表目錄................................................VI
圖目錄................................................VII
一前言...............................................1
二文獻回顧............................................3
2.1非破壞性檢測簡介.....................................3
2.1.1導電度檢測介紹.....................................3
2.1.2超音波檢測介紹.....................................5
2.2最小平方迴歸法.......................................7
三實驗步驟與方法.......................................9
3.1合金熔配與成分分析....................................9
3.2合金鍛造............................................11
3.3安定化退火與敏化處理..................................11
3.4微結構觀察與分析.....................................12
3.4.1光學顯微鏡(Optical Microscopy)....................12
3.4.2掃描式電子顯微鏡(Scanning Electron Microscopy).....13
3.5硝酸腐蝕重量損失測試：沿晶腐蝕敏感性分析(ASTM G67 Nitric Acid Mass Loss Test(NAMLT)[ASTM2]：).......................14
3.6機械性質分析.........................................15
3.7非破壞性檢測.........................................17
3.7.1導電度量測(Electrical Conductivity,%IACS)..........17
3.7.2超音波檢測.........................................17
四實驗結果與討論........................................18
4.1微結構分析...........................................18
4.1.1導電度檢測.........................................18
4.1.2超音波檢測.........................................20
4.2腐蝕性質分析.........................................25
4.3機械性質分析.........................................26
4.4非破壞性檢測與微結構、腐蝕性質、機械性質之關係..............31
4.4.1非破壞性檢測與腐蝕性質之關係...........................31
4.4.2非破壞性檢測與機械性質之關係...........................33
五結論.................................................41
六參考文獻..............................................43

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指導教授

李勝隆

審核日期

2015-8-11

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