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系統識別號 U0026-0207201914075800
論文名稱(中文) 生醫鈦合金(Ti-12Mo-6Zr-2Fe)在不同溫度下之準靜態壓縮特性與微觀組織分析
論文名稱(英文) The Influence of Strain Rate and Various Temperatures on the Quasi-Static Deformation Behavior and Microstructure of Ti-12Mo-6Zr-2Fe
校院名稱 成功大學
系所名稱(中) 機械工程學系
系所名稱(英) Department of Mechanical Engineering
學年度 107
學期 2
出版年 108
研究生(中文) 蕭介瑜
研究生(英文) Chieh-Yu Hsiao
學號 N16061391
學位類別 碩士
語文別 中文
論文頁數 122頁
口試委員 指導教授-李偉賢
口試委員-施士塵
口試委員-黃永茂
中文關鍵字 Ti-12Mo-6Zr-2Fe  低應變速率  高溫  材料萬能試驗機  熱膨脹儀  差排  準靜態壓縮 
英文關鍵字 Ti-12Mo-6Zr-2Fe  low strain rate  high temperature  Quasi-static deformation  dislocation density 
學科別分類
中文摘要 本論文主要使用材料萬能試驗機在室溫(25℃)以及高溫下(450℃與
900℃)研究Ti-12Mo-6Zr-2Fe 生醫鈦合金準靜態壓縮特性,並探討其機械性質及微觀結構。準靜態壓縮試驗所選用應變速率分別為0.001s-1、0.01s-1 和1s-1,而實驗溫度則設定為25°C、450°C、900°C。壓縮測試後再藉由光學顯微鏡(OM)及穿透式電子顯微鏡(TEM)觀察變形前後之內部顯微結構,藉此分析在不同的溫度及應變速率下材料塑變行為與微觀結構之相關性。最後利用構成方程式模擬巨觀特性。
實驗結果指出,在相同的溫度條件下Ti-12Mo-6Zr-2Fe,材料之塑流
應力、加工硬化率、應變速率敏感性係數以及理論溫升量會隨著應變速率的增加而上升;而在相同應變速率的條件下,熱活化體積會隨溫度上升而下降,塑流應力、加工硬化率、應變速率敏感性係數及理論溫升量會隨溫度下降而上升。模擬結果顯示Ti-12Mo-6Zr-2Fe 合金,可藉由CombinedJohnson-Cook & Zerilli-Armstrong 構成方程式精確的描述其塑性變形行為。
在材料微觀性質方面,透過光學顯微鏡顯示出本材料為介穩態之β
相之鈦合金,材料在450°C 之金相圖有析出物的產生,而900°C 因超過
本材料β轉換溫度,析出物重新溶解至β相,顯示為純β相之鈦合金;在
穿透式電子顯微鏡觀察下,可發現差排密度隨著溫度上升而下降,隨著應變速率上升而上升。最後結合巨觀與微觀之結果顯示,Bailey-Hirsch 方程式可準確描述塑流應力值與差排密度之關係。
英文摘要 In this thesis, the quasi-static compression properties and microstructure of the Ti-12Mo-6Zr-2Fe biomedical titanium alloy were studied at different temperatures of
25 °C, 450 °C, 900 °C and low strain rate from 0.000s-1 to 1s-1 using the universal testing machine. The high temperatures of 450° C, 900° C, were obtained by using
the deformation dilatometer.The results indicate that under the same temperature conditions, the flow stress, work hardening rate, strain rate sensitivity coefficient and theoretical temperature rise of Ti-12Mo-6Zr-2Fe, all increase with the increasing strain rate, but decrease with the
increasing temperature. However, the thermal activation volume and the activation
energy have completely opposite tendency. The Combined Johnson-Cook & Zerilli-
Armstrong model on Ti-12Mo-6Zr-2F can be used to describe the deformation
behavior.
The optical microstructure shows that the Ti-12Mo-6Zr-2Fe has a pure β type
titanium alloy at room temperature. The appear on the microstructure as the temperature is increased precipitated fine alpha and omega phases. However, as the
temperature were higher than the beta transus temperature of 754°C, a pure β type titanium alloy is found. The transmission electron microscop observations indicate
that the dislocation density decreases as the temperature is increased or the strain rate is decreased. The relationship between the stress and the dislocation density can be explained by using the Bailey-Hirsch equation accurately.
論文目次 中文摘要 I
aBstract III
致謝 XI
總目錄 XII
表目錄 1
圖目錄 2
符號說明 7
第一章 前言 10
第二章 理論與文獻回顧 12
2-1 鈦與鈦合金之介紹 12
2-1-1 生醫鈦合金介紹 13
2-1-2 Ti-12Mo-6Zr-2Fe合金介紹 14
2-1-3 Ti-12Mo-6Zr-2Fe合金成份之影響 15
2-2 塑性變形之機械測試類別 15
2-2-1 靜態或極低之應變速率(10-8<ε<10-5 s-1): 15
2-2-2 低速之應變速率(10-5<ε<100 s-1): 16
2-2-3 中速之應變速率(100<ε<102 s-1): 16
2-2-4 高速之應變速率(102<ε<104 s-1): 16
2-2-5 極高速之應變速率(104<ε<107 s-1): 16
2-3 圓柱壓縮試驗法 17
2-4 塑性變形行為機制 18
2-4-1 恆溫機構 19
2-4-2 熱活化機制 19
2-4-3 差排黏滯機制 21
2-5 構成方程式 21
2-5-1 Ludwik model[29-31] 22
2-5-2 Sokolosky& Malvern model[31] 22
2-5-3 Zerilli-Armstrong model[32, 33] 22
2-5-4 Johnson-Cook model[34-37] 23
2-5-5 Combined Johnson-Cook & Zerilli-Armstrong model [38] 24
第三章 實驗方法及步驟 37
3-1 實驗流程 37
3-2 實驗儀器與設備 37
3-2-1 材料萬能試驗機 37
3-2-2 熱膨脹儀 38
3-2-3 CNC線切割機 38
3-2-4 金相研磨拋光機 38
3-2-5 鑽石切割機 39
3-2-6 雙噴射式電解拋光機 39
3-2-7 光學顯微鏡 39
3-2-8 穿透式電子顯微鏡 39
3-3 實驗步驟 40
3-3-1 實驗試件製備 40
3-3-2 準靜態壓縮試驗 40
3-3-3 試件金相之觀察(OM) 41
3-3-4 穿透式電子顯微鏡(TEM)試片製備 42
第四章 實驗結果與討論 46
4-1 應力-應變曲線 46
4-2 加工硬化 47
4-3 應變速率敏感性係數 48
4-4 熱活化體積 49
4-5 活化能 51
4-6 溫度敏感性係數 52
4-7 理論溫升量 53
4-8 材料構成方程式 54
4-9 光學顯微鏡金相組織觀察(OM) 55
4-10 穿透式電子顯微鏡(TEM)結構觀察 56
第五章 結論 115
參考文獻 118
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