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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74662完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳錫侃(Shyi-Kaan Wu) | |
| dc.contributor.author | Yung-Chien Huang | en |
| dc.contributor.author | 黃詠騫 | zh_TW |
| dc.date.accessioned | 2021-06-17T09:05:44Z | - |
| dc.date.available | 2025-02-04 | |
| dc.date.copyright | 2020-02-04 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-01-15 | |
| dc.identifier.citation | [1] K. Otsuka, K. Shimizu, Pseudoelasticity and shape memory effects in alloys, International Metals Reviews 31 (1986) 93-114.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74662 | - |
| dc.description.abstract | 本研究利用小角度X光散射(SAXS)技術探討在Ti48.7Ni51.3形狀記憶合金中富鎳奈米域和Ti3Ni4奈米析出物於250°C時效下之演進及熱循環中之應變玻璃轉變、Mg-10.54 Li-1.11 Al-0.38 Zn (LAZ1110)合金中θ-MgLi2Al析出物在早期自然時效下之演進，以及冷軋延的等原子比CoCrFeMnNi高熵合金中奈米析出物於350–500 °C時效和Al0.2CoCrFeMnNi高熵合金中GP zone於550 °C時效之成長動力學，並針對析出物其相對體積分率、尺寸和形貌進行後續討論。Ti48.7Ni51.3應變玻璃之富鎳奈米域於淬火過程中就產生，隨著250°C時效而漸漸溶解，同時Ti3Ni4奈米析出物隨之成核、成長和粗化。其中，奈米域的鎳原子分佈為核殼結構，並由富鎳殼和高富鎳核組成。當MgLiAlZn合金固溶處理後自然時效，θ析出物之半徑從3.1奈米漸漸成長至6.9奈米，而其厚度則依然維持在約3.7奈米。θ析出物之相對體積分率在時效早期先快速上升接著趨緩，析出物成長至約17小時後達到峰值並擁有最高的硬度。而在冷軋延CoCrFeMnNi合金中之奈米析出物經500°C時效，其尺寸從原先半徑約1.2奈米之球狀析出物快速成長，並於時效60分鐘時達到析出飽和。冷軋延Al0.2CoCrFeNi合金中的雙峰時效硬化歸因於兩組GP zone的貢獻。DSC和XRD的實驗結果也顯示合金中之析出物的相演進。TEM觀察也呈現出析出物的尺寸和形貌，用以和SAXS結果相對照。最後，相關的機械性質也藉由DMA、硬度和拉伸試驗來和SAXS結果相互連結，包含應變玻璃的轉換特性、顯著的析出硬化效應等。 | zh_TW |
| dc.description.abstract | Small-angle X-ray scattering (SAXS) was used to reveal the evolutions of Ni-rich nanodomains and Ti3Ni4 nanoprecipitates in the Ti48.7Ni51.3 shape memory alloy aged isothermally at 250 °C and the strain glass transition in as-quenched Ti48.7Ni51.3 shape memory alloy during a thermal cycle, the evolution of the θ-MgLi2Al precipitates in the early aging stage at room temperature in the Mg-10.54 Li-1.11 Al-0.38 Zn (in wt.%) (LAZ1110) magnesium alloy, and the growth kinetics of nanoprecipitates of cold-rolled equiatomic CoCrFeMnNi high-entropy alloy aged at 350–500 ºC and Al0.2CoCrFeNi high-entropy alloy aged at 550 °C in terms of relative volume fraction, radius, thickness, and morphology. Ni-rich nanodomains in the Ti48.7Ni51.3 strain glass are formed in the quenching process and dissolve while Ti3Ni4 nanoprecipitates nucleate, grow and coarsen during aging. The distribution of Ni atoms in nanodomains is identified as a disk-like core–shell configuration with a Ni-rich shell and a highly Ni-rich core. The radius of θ precipitates in the MgLiAlZn alloy grows gradually from 3.1 nm to 6.9 nm with a nearly constant thickness of 3.7 nm. The relative volume fraction of θ precipitates increases rapidly in the early aging stage and then more slowly in the peak aging stage at ~17 hrs. The nanoprecipitates in the cold-rolled CoCrFeMnNi high-entropy alloy have a radius of ~1.2 nm, grow drastically in the early 30 min of aging at 500 ºC, and reach the saturation stage at 60 min aging. The double-peaked aging behavior exhibited in cold-rolled Al0.2CoCrFeNi high-entropy alloy is attributed by the contribution of the two groups of GP zones divided into GP1 and GP2 zones from 1 h of aging. DSC and XRD results demonstrate the phase evolution of precipitates in alloys. The complementary observations by TEM show the size and morphology of the precipitates. The mechanical properties, such as the frequency-dependent storage modulus, hardness and tensile stress-strain curve, are also measured to characterize the strain glass transition or quantitatively correlate with significant precipitation hardening. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T09:05:44Z (GMT). No. of bitstreams: 1 ntu-109-D03527017-1.pdf: 9448360 bytes, checksum: b899c9d0d8c93a80de53d8b7c9af7d05 (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | Contents
Abstract i 摘要 iii Chapter 1 Introduction 1 Chapter 2 Literature Review 10 2.1 Small-Angle X-ray Scattering 10 2.2 TiNi-based Shape Memory Alloys 13 2.2.1 Shape Memory Effect (SME) 15 2.2.2 Pseudoelasticity (PE) 15 2.2.3 Strain Glass Transition 16 2.3 MgLi-based Alloys 18 2.4 High Entropy Alloys 20 2.4.1 CoCrFeMnNi Alloy 21 2.4.2 AlxCoCrFeNi Alloy 23 Chapter 3 Experimental Procedures 33 3.1 Sample Preparation 33 3.1.1 Ti48.7Ni51.3 Shape Memory Alloy 33 3.1.2 Mg-10.54 Li-1.11 Al-0.38 Zn (wt.%) Alloy 33 3.1.3 Equiatomic CoCrFeMnNi High Entropy Alloy 34 3.1.4 Al0.2CoCrFeNi High Entropy Alloy 35 3.2 SAXS Measurements 35 3.2.1 In-situ SAXS Measurement 35 3.2.2 Synchrotron SAXS Measurement 37 3.3 DMA Tests 37 3.4 XRD Spectra 38 3.5 DSC Tests 38 3.6 Vickers Microhardness Measurements 38 3.7 TEM Observations 39 3.8 Tensile Tests 39 Chapter 4 Nanoparticles Evolution in Isothermally Aged Strain Glass of Ti48.7Ni51.3 Shape Memory Alloy 42 4.1 Formation and Structural Evolution of the New Nanoprecipitates during Isothermal Aging at 250ºC 42 4.2 Structural Evolution of Ni-Rich Nanodomains during Isothermal Aging at 250ºC 48 4.3 Variation of Strain Glass Temperature Tg and Frequency-Dependent Storage Modulus E0 with Aging Time at 250ºC 51 4.4 Concurrent Phase Evolutions and Kinetics of Ni-Rich Nanodomains and Ti3Ni4 Nanoprecipitates 52 4.4.1 Precipitation Kinetics and Mechanism of Ti3Ni4 Nanoprecipitates 52 4.4.2 Dissolution Kinetics and Mechanism of Ni-Rich Nanodomains 55 4.5 Role and Quantitative Correlation of Ni-Rich Nanodomains and Ti3Ni4 Nanoprecipitates to the Loss of Strain Glass Characteristic 57 4.6 Summary 59 Chapter 5 Structural Evolution and Mechanism of Strain Glass Transition in Ti48.7Ni51.3 Shape Memory Alloy 71 5.1 Results 71 5.1.1 Temperature-Dependent ASAXS Measurement of the as-Quenched Ti48.7Ni51.3 SMA 71 5.1.2 Structural Characterization of Core–Shell Disk Domains in the as-Quenched Sample by ASAXS 72 5.1.3 Structural Transition and Ordering Behavior Revealed by the In-situ ASAXS Structure Factor under the Thermal Cycle 77 5.2 Discussion 78 5.2.1 The Structural Evolution and the Reversible Behavior of the Highly Ni-Rich Disk Nanodomains under the Thermal Cycle 78 5.2.2 The Characteristics of the Structure Factor Peaks of ASAXS Profiles 80 5.2.3 The Evolution of Ordering Arrays during Heating from Tg to 250 °C 82 5.3 Summary 83 Chapter 6 Evolution and Growth Kinetics of θ Precipitates in Naturally Aged MgLiAlZn Alloy 89 6.1 Precipitate Evolution of Solution-Treated LAZ1110 Alloy During Natural Aging 89 6.2 Formation and Evolution of θ Precipitates During the Early Natural Aging Period 91 6.3 Precipitation Hardening Behavior 95 6.4 Summary 98 Chapter 7 Nano-Precipitates in Severely Deformed and Low-Temperature Aged CoCrFeMnNi High-Entropy Alloy 103 7.1 The Evolution of the SAXS Profiles at Different Aging Temperatures 103 7.2 Quantitative Characterization of the Nano-Precipitates by SAXS Modeling Analysis 106 7.3 Structural Evolution and Kinetics of Nano-Precipitation Correlated to Hardness Variation 109 7.4 TEM Observation of the Nano-Precipitates 110 7.5 Relationship between the Tensile Property and the Nano-Precipitate Evolution 111 7.6 Summary 113 Chapter 8 Evolution of Guinier-Preston Zones in Cold-Rolled Al0.2CoCrFeNi High-Entropy Alloy 119 8.1 Results 119 8.1.1 Hardness Variation 119 8.1.2 Microstructure Observation 120 8.1.3 Small-Angle X-ray Xcattering (SAXS) Analysis 121 8.1.4 Mechanical Properties 125 8.2 Discussion 126 8.2.1 Effect of Cold-Rolling on the Precipitation Behavior 126 8.2.2 Correlation between the Morphological Evolution of the GP Zones and the Mechanical Properties 128 8.3 Summary 131 Chapter 9 Conclusions 139 9.1 Nanoparticles Evolution in Isothermally Aged Strain Glass of Ti48.7Ni51.3 Shape Memory Alloy 139 9.2 Structural Evolution and Mechanism of Strain Glass Transition in Ti48.7Ni51.3 Shape Memory Alloy 140 9.3 Evolution and Growth Kinetics of θ Precipitates in Naturally Aged MgLiAlZn Alloy 141 9.4 Nano-Precipitates in Severely Deformed and Low-Temperature Aged CoCrFeMnNi High-Entropy Alloy 142 9.5 Evolution of Guinier-Preston Zones in Cold-Rolled Al0.2CoCrFeNi High-Entropy Alloy 143 References 146 Appendix A study on the Hall–Petch relationship and grain growth kinetics in FCC-structured high/medium entropy alloys 174 A.1 Introduction 174 A.2 Materials and Methods 175 A.3 Results and discussion 177 A.3.1 Grain size effect on microhardness 178 A.3.2 Solid-solution effect on microhardness 181 A.3.3 Grain growth kinetics analysis 183 A.4 Conclusions 188 A.References 196 Publications 206 | |
| dc.language.iso | en | |
| dc.subject | 鎂鋰合金 | zh_TW |
| dc.subject | 鈦鎳形狀記憶合金 | zh_TW |
| dc.subject | 析出硬化 | zh_TW |
| dc.subject | 小角度X光散射 | zh_TW |
| dc.subject | 機械性質 | zh_TW |
| dc.subject | 高熵合金 | zh_TW |
| dc.subject | Mechanical property | en |
| dc.subject | Small angle X-ray scattering | en |
| dc.subject | High-entropy alloy | en |
| dc.subject | Magnesium-lithium alloy | en |
| dc.subject | TiNi shape memory alloy | en |
| dc.subject | Precipitation hardening | en |
| dc.title | 以小角度X光散射技術探討合金早期析出行為之研究 | zh_TW |
| dc.title | The Study of the Early Precipitation Behaviors of Alloys using Small-Angle X-Ray Scattering Technique | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 林新智(Hsin-Chih Lin),曹正熙(Cheng-Si Tsao),張世航(Shih-Hang Chang),周棟勝(Tung-Sheng Chou) | |
| dc.subject.keyword | 小角度X光散射,析出硬化,鈦鎳形狀記憶合金,鎂鋰合金,高熵合金,機械性質, | zh_TW |
| dc.subject.keyword | Small angle X-ray scattering,Precipitation hardening,TiNi shape memory alloy,Magnesium-lithium alloy,High-entropy alloy,Mechanical property, | en |
| dc.relation.page | 208 | |
| dc.identifier.doi | 10.6342/NTU202000130 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-01-15 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
| 顯示於系所單位： | 材料科學與工程學系 | |
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