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系統識別號 U0026-1307201809175700
論文名稱(中文) 生醫鈦合金(Ti-29Nb-13Ta-4.6Zr)在不同溫度下之高速撞擊特性與微觀組織分析
論文名稱(英文) Dynamic impact response and microstructural evolution of Ti-29Nb-13Ta-4.6Zr biomedical alloy under high strain rate and various temperatures
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 106
學期 2
出版年 107
研究生(中文) 高子桓
研究生(英文) Tzu-Huan Kao
學號 N16054695
學位類別 碩士
語文別 中文
論文頁數 135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-29Nb-13Ta-4.6Zr合金  霍普金森桿  高溫  高應變速率  絕熱剪切帶  差排 
英文關鍵字 Ti-29Nb-13Ta-4.6Zr  Hopkinson bar  high temperature  high strain rate  dislocation density 
學科別分類
中文摘要 本文主要是利用霍普金森高速撞擊試驗機及加熱裝置,來探討Ti-29Nb-13Ta-4.6Zr生醫鈦合金在不同溫度及高應變速率荷載下之塑性變形行為及微觀結構分析。分別於實驗溫度25°C、500°C、750°C及應變速率2500s-1、3500s-1、5000 s-1條件下,進行高速撞擊實驗,藉以分析材料在塑變行為中巨觀機械性質變化,再利用(OM、TEM)對微觀結構進行分析,以了解應變速率及溫度對材料塑性變形行為與微觀結構的影響;並由構成方程式來描述巨觀及微觀之關係。
實驗結果顯示,Ti-29Nb-13Ta-4.6Zr在相同溫度下,其塑流應力值、加工硬化率、及應變速率敏感性係數、溫度敏感性係數及理論溫升量,皆隨應變速率上升而上升;而當應變速率固定時,塑流應力值、加工硬化率、及應變速率敏感性係數、溫度敏感性係數及理論溫升量,皆隨溫度值上升而下降。而熱活化體積與活化能,在固定溫度下,則隨應變速率上升而下降;而在應變速率固定下,則隨溫度上升而上升。而各條件下之塑變行為皆可利用Zerilli-Armstrong構成方程式進行模擬,並可作為工程模擬分析時之應用。
在光學顯微鏡(OM)之金相觀察中,可發現本材料為純β相之鈦合金,且在25°C,5000 s-1之條件下可發現絕熱剪切帶之形成與晶粒組織形貌之改變;在穿透式電子顯微鏡(TEM)觀察下,可發現差排密度隨著應變速率上升而上升,隨著溫度下降而下降,此外,隨著應變速率的上升,可以觀測到差排環的產生。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。
關鍵字:Ti-29Nb-13Ta-4.6Zr合金、霍普金森桿、高溫、高應變速率、絕熱剪切帶、差排
英文摘要 SUMMARY
In this study, dynamic impact response and microstructural evolution of Ti-29Nb-13Ta-4.6Zr biomedical alloy under high strain rates, ranging from 2500s-1 to 5000s-1 and various temperatures of 25°C, 500°C, and 750°C were investigated by using split-Hopkinson pressure bar.
The results show that the mechanical properties of Ti-29Nb-13Ta-4.6Zr are strongly affected by strain rate and temperature. For instance, for a given temperature, the flow stress, work hardening rate, strain rate sensitivity, temperature sensitivity, and theoretical temperature rise all increase with the increasing strain rate, but decrease with the increasing temperature. However, the thermal activation volume and the activation energy turn out to have the exact opposite result. The Zerilli-Armstrong constitutive law can be used to precisely describe the deformation behavior of Ti-29Nb-13Ta-4.6Zr under different strain rates and temperatures.
The optical microstructure shows that Ti-29Nb-13Ta-4.6Zr has a pure β type titanium alloy as expected. In addition, adiabatic shear band can be observed at high strain rate of 5000s-1 and 25°C. The transmission electron microscopic observations show that the dislocation density increases with the increasing strain rate or the decreasing temperature. Moreover, dislocation cells can be observed as strain rate is higher than 2500s-1. The relationship between the dislocation density and the flow stress can be described by using Bailey-Hirsch equation.
Key words: Ti-29Nb-13Ta-4.6Zr, Hopkinson bar, high temperature, high strain rate, dislocation density
論文目次 總目錄
中文摘要 I
abstract III
致謝 XII
總目錄 XIII
表目錄 XVI
圖目錄 XVII
符號說明 XXV
第一章 前言 1
第二章 理論與文獻回顧 5
2-1 鈦與鈦合金之介紹 5
2-1-1生醫鈦合金介紹 6
2-1-2 Ti-29Nb-13Ta-4.6Zr合金介紹 6
2-1-3 Ti-29Nb-13Ta-4.6Zr合金成份之影響[20, 21] 7
2-2 塑性變形之機械測試類別 8
2-2-1 靜態或極低之應變速率(10-8<ε<10-5 s-1): 8
2-2-2 低速之應變速率(10-5<ε<100 s-1): 8
2-2-3 中速之應變速率(100<ε<102 s-1): 9
2-2-4 高速之應變速率(102<ε<104 s-1): 9
2-2-5 極高速之應變速率(104<ε<107 s-1): 9
2-3一維波傳理論 10
2-4霍普金森撞擊試驗機之原理 12
2-5材料塑性變行機制與特性 14
2-5-1 恆溫機制 15
2-5-2熱活化機制 16
2-5-3差排黏滯機制 17
2-6絕熱剪切 18
2-7構成方程式 19
2-7-1 Ludwik model[38-40] 20
2-7-2 Sokolosky& Malvern model[40] 20
2-7-3 Johnson-Cook model[41-44] 20
2-7-4 Zerilli-Armstrong model[45, 46] 21
第三章 實驗方法及步驟 37
3-1 實驗流程 37
3-2 實驗設備與儀器 37
3-2-1 金相研磨拋光機 37
3-2-2 CNC線切割機 38
3-2-3 霍普金森桿撞擊試驗機 38
3-2-4 加熱爐 39
3-2-5鑽石刀片切割機 40
3-2-6 雙噴式電解拋光機 40
3-2-7 光學顯微鏡(OM) 40
3-2-8 穿透式電子顯微鏡 40
3-3 實驗步驟 41
3-3-1 實驗試件之製備 41
3-3-2 動態衝擊試驗 41
3-3-4 試件金相之觀察(OM) 42
3-3-5 穿透式電子顯微鏡(TEM)試片製備 43
第四章 實驗結果與討論 45
4-1應力-應變曲線 45
4-2加工硬化率 46
4-3應變速率敏感性係數 47
4-4熱活化體積 48
4-5活化能 50
4-6溫度敏感性係數 51
4-7理論溫升量 52
4-8材料構成方程式 53
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 127
參考文獻 130

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