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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人(Jer-Ren Yang) | |
| dc.contributor.author | Tulustia Japanesa | en |
| dc.contributor.author | 鄭黛婷 | zh_TW |
| dc.date.accessioned | 2022-11-23T09:24:56Z | - |
| dc.date.available | 2021-08-06 | |
| dc.date.available | 2022-11-23T09:24:56Z | - |
| dc.date.copyright | 2021-08-06 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-07-20 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/80079 | - |
| dc.description.abstract | 本文使用低溫輥軋與後續退火研究其對於CoCrNi 中熵合金微結構與機械性質的影響。觀察微結構可發現低溫輥軋導入高差排密度、剪切帶以及大量變形雙晶，這些低溫變形組織使材料之最大抗拉強度約1500 MPa、破裂應變約2%。後續700°C退火使冷輥試片產生部分再結晶結構、800°C 退火產生完全再結晶結構，增加退火溫度或退火時間皆使材料之強度下降，但同時可提升伸長量。600°C退火熱處理中可觀察到退火誘導異常硬化(annealing-induced abnormal hardening)現象，材料之強度與硬度與退火前相比提升約25%，與更高退火溫度相比，在相同退火時間下，更可提升約50%。和室溫冷輥軋相比，低溫輥軋可導入更多應變能，有效提升再結晶速率，且無論是部分再結晶或是完全再結晶組織，皆可證實低溫輥軋具有更佳的晶粒細化效果。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-23T09:24:56Z (GMT). No. of bitstreams: 1 U0001-1207202111233800.pdf: 10887443 bytes, checksum: d3e57821fcc4c5c821299ef35884c1c3 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | "CONTENT 口試委員會審定書 i ACKNOWLEDGMENT ii ABSTRACT iv 摘要 v CONTENT vi LIST OF FIGURES viii LIST OF TABLES xv LIST OF EQUATIONS xvi CHAPTER I INTRODUCTION 1 CHAPTER II LITERATURE REVIEW 3 2.1 High Entropy Alloy (HEA) 3 2.2 CoCrNi Medium Entropy Alloy (MEA) 9 2.3 Twinning 14 2.3.1 Annealing twin 15 2.3.2 Deformation twin 17 CHAPTER III RESEARCH METHODOLOGY 20 3.1 Experimental procedure 20 3.1.1 Experimental procedure flow chart 20 3.1.2 Sample composition 20 3.1.3 Cryo rolling and post-annealing treatment 22 3.2 Testing and analysis 23 3.2.1 Hardness test 23 3.2.2 Tensile testing 24 3.2.3 X-ray Diffraction (XRD) 24 3.2.4 Scanning Electron Microscopy – Electron Backscattered Electron (SEM-EBSD) 25 3.2.5 Transmission Electron Microscopy (TEM) 25 CHAPTER IV RESULT AND DISCUSSION 27 4.1 Mechanical properties after cryo rolling and annealing 27 4.2 Microstructure evolution of CoCrNi after cryo rolling and subsequent annealing 33 4.2.1 Microstructure of CoCrNi after cryo rolling 33 4.2.2 Microstructure evolution of cryo rolled CoCrNi after annealing 37 4.2.3 Microstructure evolution of abnormal-induced hardening by annealing on cryo rolled CoCrNi 47 4.2.4 Interrupted tensile test for 700-60, 700-480, and 800-60 53 4.3 Comparison between cryo rolling and room-temperature rolling on CoCrNi to the mechanical properties and microstructure 68 4.3.1 Comparison of microstructure evolution between cryo rolling and cold rolling 69 4.3.2 Comparison of the mechanical properties of cryo rolled and cold rolled CoCrNi 72 CHAPTER V CONCLUSION 75 CHAPTER VI FUTURE WORK 77 REFERENCES 79 " | |
| dc.language.iso | en | |
| dc.subject | 中熵合金 | zh_TW |
| dc.subject | 低溫輥軋 | zh_TW |
| dc.subject | 退火 | zh_TW |
| dc.subject | 變形雙晶 | zh_TW |
| dc.subject | 部分再結晶 | zh_TW |
| dc.subject | CoCrNi | zh_TW |
| dc.subject | 完全再結晶 | zh_TW |
| dc.subject | fully recrystallization | en |
| dc.subject | CoCrNi | en |
| dc.subject | medium entropy alloy | en |
| dc.subject | cryo rolling | en |
| dc.subject | annealing | en |
| dc.subject | deformation twin | en |
| dc.subject | partially recrystallization | en |
| dc.title | 低溫輥軋與後續退火對CoCrNi中熵合金微觀結構與機械性質的影響 | zh_TW |
| dc.title | The effect of cryo rolling and annealing on microstructure and mechanical properties of CoCrNi medium entropy alloy | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王樂民(Hsin-Tsai Liu),陳志遠(Chih-Yang Tseng) | |
| dc.subject.keyword | CoCrNi,中熵合金,低溫輥軋,退火,變形雙晶,部分再結晶,完全再結晶, | zh_TW |
| dc.subject.keyword | CoCrNi,medium entropy alloy,cryo rolling,annealing,deformation twin,partially recrystallization,fully recrystallization, | en |
| dc.relation.page | 84 | |
| dc.identifier.doi | 10.6342/NTU202101398 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2021-07-21 | |
| 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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