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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/69367完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳錫侃 | |
| dc.contributor.author | Che-Hsuan Su | en |
| dc.contributor.author | 蘇哲萱 | zh_TW |
| dc.date.accessioned | 2021-06-17T03:13:55Z | - |
| dc.date.available | 2028-12-31 | |
| dc.date.copyright | 2018-07-19 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-07-11 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/69367 | - |
| dc.description.abstract | 本文探討六種中/高熵合金FeCoNiCrMn、FeCoNiCrPd、FeCoNiCr、FeCoNiMn、CoNiCr以及CoNiMn經80%冷軋延後在不同的退火溫度及時間下之再結晶行為及晶粒成長特性。由各合金的δ、∆H_mix、VEC值以及XRD量測皆顯示此六種合金為單一FCC相的結構。再結晶後合金的硬度值會隨著晶粒大小的增加而下降並符合Hall-Petch關係式Hv=H0+KHd-1/2，其中KH值以三元的CoNiCr為最大，五元的FeCoNiCrPd為最小，此因後者之疊差能最大與剪力模數最小所致。又只經80%冷軋延的合金表面硬度，以CoNiCr為最硬，這顯示在中/高熵合金中，固溶硬化的程度並不會因為所添加的合金元素數的增加而上升，反而是與所添加的元素種類較相關。本文也對此六種80%冷軋延之合金做不同條件的退火處理以觀察其晶粒成長行為，發現晶粒成長指數1/n值在FeCoNiCrPd合金約為3.5，CoNiMn、FeCoNiCr、FeCoNiCrMn合金的1/n值接近於2.8，CoNiCr及FeCoNiMn合金的1/n值接近於2.9，此等1/n值皆大於純金屬的2。而晶粒成長的活化能則以FeCoNiCrPd合金最大，為831.9kJ/mol，CoNiMn合金最小，為325.1kJ/mol，但此等值也都比傳統合金高出甚多，顯示中/高熵合金之晶界移動易受溶質拖曳效應及緩慢擴散因素等的影響；此外，合金元素的自行擴散所需活化能的大小也會造成上述晶粒成長活化能的差異。 | zh_TW |
| dc.description.abstract | In this study, recrystallization behavior and grain growth characteristics of homogenized and 80% cold-rolled FeCoNiCrMn、FeCoNiCrPd、FeCoNiCr、FeCoNiMn、CoNiCr and CoNiMn multi-component equiatomic medium / high entropy alloys(MEAs/HEAs) heated at different annealing time and temperature are investigated. The values of δ、∆H_mix and VEC in these six alloys all indicate the formation of single-phase FCC structure. The hardness of recrystallized alloys decreases as the grain size increases, and obeys the Hall-Patch equation, Hv=H0+KHd-1/2. The ternary CoNiCr alloy has the highest KH value, whereas the quinary FeCoNiCrPd alloy has the lowest one. This phenomenum is caused by the largest stacking fault energy and smallest shear modulus exhibited in FeCoNiCrPd alloy. After 80% cold rolling, the surface hardness of the ternary CoNiCr alloy is hardest, indicating that solid solution hardening in MEAs/HEAs is not determined by the number of soluted elements but by the kind of the element. Furthermore, all six alloys have the grain growth exponents 1/n higher than 2 with FeCoNiCrPd alloy having the highest activation energy of grain growth, say 831.9kJ/mol which is much higher than that in the conventional alloys. This characteristic suggests that the effects of the solute drag and the sluggish diffusion control the grain boundary motion. Moreover, the self-diffusion activation energy of the element exhibited in the alloy also affects the MEAs/HEAs activation energy of grain growth. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T03:13:55Z (GMT). No. of bitstreams: 1 ntu-107-R05527033-1.pdf: 6925642 bytes, checksum: c4d6e1e7ac0d2be8ed2537aae2219970 (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | 口試委員審定書 i
誌謝 iii 摘要 v Abstract vii 目錄 ix 第一章 前言 1 第二章 文獻回顧 3 2-1 高熵合金簡介 3 2-1-1 高熵效應(High-entropy effect) 4 2-1-2 晶格扭曲效應(Lattice distortion effect) 5 2-1-3 緩慢擴散效應(Sluggish diffusion effect) 6 2-1-4 雞尾酒效應(Cocktail effect) 7 2-2 FeCoNiCrMn系統與FeCoNiCrPd之討論與選擇 7 2-3 Hall-petch 關係式 9 2-4 晶粒成長效應 11 第三章 實驗步驟 21 3-1 高熵合金之試片準備 21 3-2 熱處理 22 3-3 微硬度(Vickers Mircohardness)量測 23 3-4 光學顯微鏡(OM)與掃描式電子顯微鏡(SEM)的觀察與晶粒大小的量測 24 3-5 XRD試驗 25 3-6 實驗流程 25 第四章 實驗結果 30 4-1 高熵合金相的分析 30 4-2 Hall-Petch 關係式與微硬度值的探討 32 4-2-1 FeCoNiCrMn高熵合金的Hall-Petch 關係 32 4-2-2 FeCoNiCrPd高熵合金的Hall-Petch 關係 33 4-2-3 FeCoNiCr中熵合金的Hall-Petch 關係 34 4-2-4 FeCoNiMn中熵合金的Hall-Petch 關係 34 4-2-5 CoNiCr中熵合金的Hall-Petch 關係 35 4-2-6 CoNiMn中熵合金的Hall-Petch 關係 36 4-2-7 Hall-Petch關係式的綜合討論 36 4-2-8 微硬度值的綜合討論 38 4-3 晶粒成長之效應 40 4-3-1 FeCoNiCrMn 高熵合金的晶粒成長 40 4-3-2 FeCoNiCrPd 高熵合金的晶粒成長 41 4-3-3 FeCoNiCr 中熵合金的晶粒成長 42 4-3-4 FeCoNiMn 中熵合金的晶粒成長 43 4-3-5 CoNiCr 中熵合金的晶粒成長 44 4-3-6 CoNiMn 中熵合金的晶粒成長 45 4-3-7 綜合討論 46 第五章 結論 95 參考文獻 97 | |
| dc.language.iso | zh-TW | |
| dc.title | 三元至五元FCC結構中/高熵合金Hall-Petch關係與晶粒成長之研究 | zh_TW |
| dc.title | A study on Hall-Petch relationship and grain growth of ternary to quinary FCC-structured medium/high entropy alloys | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林新智,陳志軒,張世航,周棟勝 | |
| dc.subject.keyword | 中/高熵合金,Hall-Petch關係,微硬度值,晶粒成長指數,晶粒成長活化能, | zh_TW |
| dc.subject.keyword | Medium / High entropy alloys,Hall-Petch relationship,Hardness,Grain growth exponent,Activation energy of grain growth, | en |
| dc.relation.page | 104 | |
| dc.identifier.doi | 10.6342/NTU201801426 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-07-11 | |
| 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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