以即時中子繞射量測鎳基合金之應變速率效應

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姓名

吳珊瑀(Shan-Yu Wu) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

以即時中子繞射量測鎳基合金之應變速率效應
(Strain-rate-effect on the Lattice-strain Evolution in Polycrystalline Nickel Alloy)

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摘要(中)

本研究使用 Inconel 617 鎳基合金來探討應變速率效應。Inconel 617是第四代先進核反應系統的熱交換器候選材料之一。這個實驗在美國橡樹嶺國家實驗室進行，利用VULCAN在高能量的spallation中子源和搭配新開發動態讀取軟體來建立一個連續即時量測的環境。一般來說，楊氏模數會隨應變速率增快而增加。此實驗發現不同微觀模數會隨應變速率改變。在微觀下，{111}晶面的模數和巨觀的模數改變趨勢相反。我們搭配分子模擬及電子穿透顯微鏡來比較觀測到的應變速率效應。

摘要(英)

Inconel 617 is a structural-material candidate for the intermediate heat exchanger used in the Generation IV Reactor Power Plant. It is important to investigate its strain rate effect. We use both the high-flux neutrons at the Spallation Neutron Source and the novel data acquisition with reduction technique at the VULCAN Engineering Diffractometer to create in-situ experimental environment. Upon different strain rates, a change in the lattice modulus was discovered. In general, the greater Young’s moduli are typically in proportional to the bulk strain rate. The trend of the lattice-modulus transition is opposite to the changes of bulk modulus as a function of the strain rates. We also apply molecular dynamics (MD) simulation and transmission electron microscopy (TEM) to compare the measured strain rate effect.

關鍵字(中)

★ 及時中子繞射
★ 應變效應
★ 楊氏模數
★ 拉伸試驗

關鍵字(英)

★ Young’’s modulus
★ strain rate effect
★ in-situ neutron diffraction
★ tensile test

論文目次

Abstract iii
摘要 iv
致謝 v
Chapter 1 Introduction & Literature Review 1
1.1. Mechanical Property 1
1.1.1. Stress-Strain Curve 1
1.1.2. Microstructure 3
1.1.3. Strain Rate Effect 4
1.2. In-situ Neutron Diffraction 6
1.2.1. Concepts of Diffraction 6
1.2.2. Neutron Source 7
1.2.3. Time-of-ﬂight (TOF) 8
1.2.4. In-situ Loading 8
1.3. Motivation 9
1.4. Flow Chart of the Thesis 14
Chapter 2 Material & Experiments & Simulation 15
2.1 Material 15
2.2 Molecular Dynamic (MD) Simulation 17
2.3 In-situ Neutron Diffraction 18
2.4 Transmission Electron Microscopy 21
Chapter 3 Results 22
3.1 Tensile Tests 22
3.2 TEM Examination 22
3.3 Molecular dynamic (MD) simulation 24
3.4 Neutron-Data Analyses 25
3.4.1 Peak intensity evolution 26
3.4.2 Lattice strain calculation 27
3.4.3 Peak width evolution 27
Chapter 4 Discussion 56
Chapter 5 Conclusions 59
Reference 61

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指導教授

黃爾文(E-Wen Huang)

審核日期

2012-7-27

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