王文雄臺灣大學：材料科學與工程學研究所李江浩Lee, Jang HaoJang HaoLee2007-11-262018-06-282007-11-262018-06-282004http://ntur.lib.ntu.edu.tw//handle/246246/55336本實驗使用VAR熔配單一成分之Ti49.7Ni50.3形狀記憶合金，鑄錠試片經均質化以及熱滾軋後，在900℃進行固溶處理，之後淬至冰水中，再進行不同縮減量的冷滾軋，利用DSC和XRD量測以及穿透式電子顯微鏡觀察其不同縮減量之顯微組織的變化。 實驗結果得知TiNi形狀記憶合金之變形調適機制，主要是麻田散體兄弟晶以雙晶型式作調適。隨著不同的冷軋延量，其雙晶調適機制也隨之改變。在較低的冷軋延量（5％）時，主要以 <011> typeⅡ twinning做調適。當冷軋延量增加時（15％），麻田散體次組織帶內之調適雙晶型式逐漸改變，不再以 <011> typeⅡ twinning為主，出現一些交插之針狀雙晶平板，以及大量的差排和缺陷。當冷軋延量達30％時，局部區域出現非晶質化，且可能有應力誘發母相SIP(stress-induced parent phase)的機制發生。A Ti-50.3at.％Ni shape memory alloy was melted by VAR in this study. The ingot was homogenized and hot-rolled at 850℃. After solution-treatment at 900℃ for 1 h followed by quenching into 3℃ water, the specimens were cold-rolled at room temperature to various reduction in thickness. The microstructure and crystal structure of cold-rolled specimens were analyzed by Differential Scanning Calorimeter (DSC), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). The results shows that the deformation mechanism of TiNi SMA is dominant by twinning accommodation in the martensite variants . The twinning mode is changed with degree of cold-working . At slight cold reduction (5％) , the <011> typeⅡ twinning mode is dominant .However at heavy cold reduction (15％), the twinning modes inside the martensite substructural bands are different. Some cross-hatched twinning plates , heavy dislocation and defects are observed. When the cold-reduction finally reaches 30％ , mechanical amorphisation happens in local regions. At the same time , the stress-induced parent phase also happen.摘要 第一章 前言……………………………………………….…. 1 第二章 文獻探討……………………………………….……. 6 2-1 形狀記憶合金簡介……………………………………... 6 2-2 熱彈性麻田散體相變態………………………………... 6 2-3 擬彈性效應……...…..……….………………………… 10 2-3-1 應力誘發麻田散體………….…………….………… 10 2-3-2 超彈性………………………………………………… 11 2-3-3 似橡膠性……..……………………………………… 11 2-4 形狀記憶效應…..……………………………………... 12 2-5 鈦鎳合金相結構與相變態…………………………..... 14 2-5-1 R相結構與相變態 ………………………………... 15 2-5-2 TiNi合金的時效析出物……………………..……… 17 2-5-3 TiNi合金相的變態……………………………...…. 19 2-6 TiNi形狀記憶合金之滾軋製程……………………….... 21 第三章 實驗方法…………………………………………….. 35 3-1 合金熔配……………………………………………..... 35 3-2 試片準備……………………………………………..... 36 3-3 軋延方法與設備……………………………………..... 37 3-4 微硬度測試………………..………………………..... 38 3-5 DSC變態溫度測試…………………………………...... 38 3-6 X光繞射分析…………………………………….…..... 39 3-7穿透式電子顯微鏡（TEM）觀察…….……………...... 39 第四章 實驗結果與討論…………………………………….. 44 4-1 合金成分選擇與熱處理方式………………..………... 44 4-2 DSC變態溫度量測….………………………………..... 45 4-3 HV微硬度測試…….………………………………….... 51 4-4 XRD分析……………………..……………………….... 53 4-5 TEM顯微組織觀察…………………………………...... 56 4-5-1 Ti49.7Ni50.3顯微組織觀察…………………………. 57 4-5-2麻田散體安定化現象………………………………… 67 第五章 結論………………………………….….……… 93 參考文獻……………………….………….……………… 956142640 bytesapplication/pdfen-US應力誘發母相SIPthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/55336/1/ntu-93-R91527029-1.pdf