經由等徑轉角擠型(Equal Channel Angular Extrusion, ECAE)晶粒細化至0.46
μm AZ31 鎂合金具有強烈織構(Texture)組織，在李文讀的拉伸實驗結果發現在
較慢應變速率下延展性較佳，但在本實驗之平行Basal 結晶面壓縮實驗中並無此
現象，且應變速率敏感係數幾乎為零。從工程應力-應變壓縮曲線圖發現其為雙
晶變形之行為。在壓縮變形初期，應變為拉伸雙晶所貢獻。
室溫所進行之平行Basal 結晶面壓縮實驗首次觀察到由雙晶變形所造成之應
變集中帶(Shear Band, SB)的產生，且其和壓縮軸成45 度夾角，Shear Band 也隨
著應變的增加其寬度隨之變寬。
在與Basal 結晶面夾角為45 度之壓縮實驗當中，雖然為啟動Basal 滑移之變
形機制但其延展性卻是相當地差，在45 度壓縮實驗當中也有發現有Shear Band
之產生但和平行Basal 結晶面壓縮之結果截然不同，45 度壓縮之Shear Band 極
為細幾乎沒有寬度，且在低應變量時就會造成裂縫之生成。
平行Basal 結晶面之拉伸實驗結果顯示，當應變速率越慢其延展性越佳，為
應變速率之函數。在此實驗當中並沒有觀察到任何Shear Band 之生成，但隨著
應變速率的下降發現到詴片表面之粗糙程度就越大。詴片表面之刮痕經拉伸變形
後並沒有觀察到有任何偏折之現象，所以在較慢之應變速率下提升延展性並非由
晶界滑移所造成。

none

目錄
目錄.......................................................................................................................... Ⅰ
表目錄...................................................................................................................... Ⅲ
圖目錄...................................................................................................................... Ⅳ
摘要.......................................................................................................................... Ⅹ
一、前言.................................................................................................................. 1
二、文獻回顧.......................................................................................................... 2
2-1 ECAE 之原理 .............................................................................................. 2
2-2 影響ECAE 變形之參數 ............................................................................ 2
2-3 極細晶材料之變形行為 ............................................................................ 3
2-3-1 極細晶材料之延展性 ..................................................................... 3
2-3-2 極細晶材料之晶界滑移行為 ......................................................... 4
2-3-3 極細晶材料之應變速率敏感值 ..................................................... 5
2-4 極細晶材料之滑移帶(Shear Band) ........................................................... 6
2-5 室溫鎂合金之變形行為 ............................................................................ 7
2-5-1 雙晶和滑移 ........................................................................................ 7
2-5-2 織構(Texture)的影響 ......................................................................... 8
三、研究目的.......................................................................................................... 10
四、實驗方法.......................................................................................................... 11
4-1 材料與ECAE 製成 .................................................................................... 11
4-2 壓縮詴片製備 ............................................................................................ 11
4-3 拉伸詴片製備 ............................................................................................ 12
4-4 掃描式電子顯微鏡詴片製作 .................................................................... 13
4-5 背向式電子繞射詴片製作 ........................................................................ 13
五、實驗結果.......................................................................................................... 14
5-1 壓縮實驗 .................................................................................................... 14
II
5-1-1 極細晶0.46μm AZ31 鎂合金之壓縮實驗 ................................... 14
5-1-2 極細晶0.46μm AZ31 鎂合金之應變集中帶發展 ....................... 14
5-1-3 1.83μm AZ31 鎂合金之壓縮實驗 ................................................ 14
5-1-4 1.83μm AZ31 鎂合金之EBSD 分析 ........................................... 15
5-1-5 AZ31 鎂合金之45 度壓縮實驗..................................................... 16
5-2 拉伸實驗 .................................................................................................. 17
5-2-1 AZ31 鎂合金之拉伸實驗............................................................... 17
六、討論.................................................................................................................. 18
6-1 應變集中帶 ................................................................................................. 18
6-2 織構對極細晶AZ31 變形行為之影響 ...................................................... 18
6-3 晶界滑移 ..................................................................................................... 20
七、結論.................................................................................................................. 22
八、參考文獻.......................................................................................................... 23
表.............................................................................................................................. 26
圖.............................................................................................................................. 29

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