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論文名稱 Title |
AZ31鎂合金擠型材之變形集中行為研究 Strain localization in extruded AZ31 Magnesium alloy |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
89 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2009-07-30 |
繳交日期 Date of Submission |
2009-08-06 |
關鍵字 Keywords |
動態再結晶、鎂合金、變形集中 EBSD, Dynamic Recrystallization, AZ31 |
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統計 Statistics |
本論文已被瀏覽 5658 次,被下載 13 次 The thesis/dissertation has been browsed 5658 times, has been downloaded 13 times. |
中文摘要 |
在200℃,10-3s-1應變率的條件下,以壓縮方式對於擠型之AZ31鎂合金進行變形,研究其顯微組織演化過程。因為擠型材集合組織之特色,試片首先以拉伸雙晶方式變形,繼而以壓縮雙晶變形。在此變形期間,伴隨著晶界產生鋸齒狀之動態再結晶的進行。動態再結晶除了可在晶界形成也可生長於雙晶界上。隨著壓縮量之增加,動態再結晶亦持續增生,試片因動態再結晶導致之變形集中現象,形成了剪切帶(Shear Zone)。最後在動態再結晶聚集處產生裂縫,在高變形量下因此而斷裂。 從動態再結晶開始生長到剪切帶形成期間,動態再結晶晶粒之晶向開始時與原始晶粒晶向相近,之後的動態再結晶晶粒,有著漸漸向與受力軸呈45度角旋轉的趨勢。剪切帶中的原始晶粒之晶向亦有旋轉之傾向。 |
Abstract |
none |
目次 Table of Contents |
目錄 一、 前言…................................................................................................................1 二、 文獻回顧…........................................................................................................2 2-1鎂與鎂合金的變形機制.............................................................................2 2-1.1低溫下的變形機制:滑移系統.................................................................2 2-1.2低溫下的變形機制:變形雙晶.................................................................2 2-1.3高溫下的變形機制:動態再結晶.............................................................3 2-1.4鎂合金與集合組織之關係.......................................................................4 2-2鎂合金的動態再結晶機制..........................................................................5 2-2.1連續動態再結晶:轉動動態再結晶.........................................................6 2-2.2不連續動態再結晶:晶界移動式動態再結晶.........................................6 2-2.3動態再結晶的形成機制探討...................................................................7 2-2.4動態再結晶的形成過程...........................................................................8 2-2.5動態再結晶的晶向特性...........................................................................9 2-2.6在雙晶上的動態再結晶...........................................................................9 2-3變形集中現象..............................................................................................9 2-3.1應變集中現象...........................................................................................9 2-3.2應變集中特色.........................................................................................10 三、 研究目的......................................................................................................... 12 四、 實驗方法..........................................................................................................13 4-1實驗流程....................................................................................................13 4-2壓縮試片製作............................................................................................13 4-3壓縮試驗....................................................................................................13 4-4應力應變分析............................................................................................14 4-5金相試片製作............................................................................................14 4-6光學顯微鏡與掃描式電子顯微鏡觀察....................................................14 4-7背散式電子繞射分析與其試片製作........................................................15 五、 實驗結果..........................................................................................................17 5-1試片外觀....................................................................................................17 5-2微結構觀察................................................................................................17 5-2.1微觀組織演化過程.................................................................................17 5-2.2變形集中帶觀察….................................................................................18 5-2.3晶界旁組織演化過程….........................................................................18 5-2.4應力應變曲線與演化過程.....................................................................18 5-3 EBSD結晶方向分析.................................................................................18 5-3.1初始材料集合組織.................................................................................19 5-3.2動態再結晶晶向分析.............................................................................19 5-3.3變形集中之EBSD分析..........................................................................19 六、 討論..................................................................................................................21 6-1集合組織與微結構變化............................................................................21 6-2顯微組織演化與討論................................................................................21 6-3變形集中討論............................................................................................22 七、 結論..................................................................................................................25 八、 參考文獻..........................................................................................................26 |
參考文獻 References |
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