臺灣博碩士論文加值系統

摘要
本文以Ti-6Al-4V合金棒材為材料，設計不同冷速的熱處理來觀察相變態，並在單相區(1050℃)、雙相區(900℃)分別施以10、20、40﹪的塑性變形來探討對相變態的影響。
在實驗的第一部份藉由STEM-EDS技術來探討魏德曼組織的形成機構，由實驗數據可發現Ti、Al、V三種置換型合金元素在魏德曼組織形成中會參與擴散，故可證實魏德曼組織形成機構為擴散形相變態。
在不同冷速的相變態實驗中當冷速越快可產生板片較細的魏德曼組織，當冷速達到60℃/S則形成麻田散的組織，而在麻田散板片間似乎存在有高溫相，但利用場發射電子顯微鏡作高解析影相發現並無高溫相存在。以麻田散體、魏德曼組織、等軸晶α三種不同組織分別以0.5、1、10℃/S加熱至1100℃，求其相變態溫度，可發現由於麻田散必需先由Prior-β的晶界處先孕核才可生長，故需要較多的能量因此相變態溫度會較Wα及E-α來得高。
不論在單相區或雙相區做大量的塑性變形，會導致大量的缺陷產生，這些缺陷可堆積在β相的界面，增進了置換型原子的擴散速率，提早了擴散型相變態的產生，而嚴重的塑性變形所造成的大量缺陷會使α成核位置增加，而當α相開始成長時會互相碰撞阻礙而限制Wα的形成。

目錄
摘要
第一章 前言………………………………………………………..1
第二章 文獻回顧…………………………………………………..3
2-0前言……………………………………………………………3
2-1鈦合金中所添加合金元素的作用……………………………3
2-2固溶強化………………………………………………………4
2-3商用鈦合金的分類……………………………………………5
2-4鈦合金中各種α相的型態……………………………………6
2 -5麻田散體………………………………………………………9
2-6α相的滑動模式……………………………………………….12
2-7α相的雙晶…………………………………………………….12
2-8界面相…………………………………………………………13
2-9固態相變態機構………………………………………………14
2-10再結晶機構…………………………………………………..16
第三章 材料準備及使用儀器
3-1實驗材料與實驗流程…………………………………………29
3-2熱處理與熱機處理……………………………………………29
3-3金相的觀察與SEM觀察……………………………………..29
3-4硬度試驗……………………………………………………..30
3-5TEM試片製作及觀察………………………………………. 30
3-6電子探針微分析儀…………………………………………...31
3-7X光繞射儀……………………………………………………31
第四章 原材觀察與魏德曼形成機構探討
4-1前言…………………………………………………………...34
4-2實驗方法………………………………………………………34
4-3結果與討論……………………………………………………35
4-3-1原材顯微組織觀察………………………………………..35
4-3-2β相變態溫度的量測………………………………………35
4-3-3魏德曼形成機構的探討…………………………………...36
4-4結論…………………………………………………………….39
第五章 熱處理對相變態的影響
5-1前言……………………………………………………………..70
5-2實驗方法………………………………………………………..71
5-3結果與討論……………………………………………………..71
5-3-1 X-Ray測定α與α''的c/a值……………………………..71
5-3-2不同組織在昇溫的相變態溫度……………………………74
5-3-3 不同冷速下的相變態………………………………………75
5-4結論……………………………………………………………..78
第六章 塑性變形對相變態的影響
6-1前言……………………………………………………………..107
6-2實驗方法………………………………………………………..107
6-3結果與討論……………………………………………………..108
6-3-1塑性變形後缺陷的觀察…………………………………….108
6-3-2塑性變形對α、βMorphology的影響…………………..109
6-4結論…………………………………………………………….111
第七章 總結論……………………………………………………….133
建議未來方向…………………………………………………………135
參考文獻………………………………………………………………136

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