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系統識別號 U0026-2907201021262400
論文名稱(中文) 熱機處理對Ti-7.5Mo合金機械性質的影響
論文名稱(英文) Effect of thermomechanical treatment on mechanical properties of Ti-7.5Mo alloys
校院名稱 成功大學
系所名稱(中) 材料科學及工程學系碩博士班
系所名稱(英) Department of Materials Science and Engineering
學年度 98
學期 2
出版年 99
研究生(中文) 陳俊廷
研究生(英文) Jyun- Ting Chen
電子信箱 6657073@yahoo.com.tw
學號 n5697146
學位類別 碩士
語文別 英文
論文頁數 120頁
口試委員 指導教授-陳瑾惠
指導教授-朱建平
口試委員-林殿傑
口試委員-林家緯
口試委員-李智銘
中文關鍵字 鈦合金  熱機處理  機械性質  微觀結構 
英文關鍵字 titanium alloys  thermomechanical treatment  mechanical properties  microstructure 
學科別分類
中文摘要 由CMRT實驗室發展出的Ti-7.5Mo 合金於1999年通過美國專利申請(U.S. Patent No. 6409852),為一深具實用潛力的鈦合金。本研究對Ti-7.5Mo合金進行不同的熱機處理,藉以探討其對機械性質,微觀結構與析出相的影響。
實驗結果顯示、Ti-7.5Mo合金經過熱滾壓,再進行T1℃固熔熱處理t1後,合金結構為細針狀麻田散鐵的外觀,主要的相屬介穩的α”相。其彎曲彈性模數為55GPa,拉伸彈性模數為70GPa。微結構,主要相與機械性質皆相近於鑄造Ti-7.5Mo合金。
Ti-7.5Mo經過熱滾壓後,然後進行T1℃固熔熱處理t1後,再進行T3℃時效熱處理t2分鐘後空冷,可以得到與Ti-6Al-4V相近的機械性質(YS: 871 MPa、UTS: 1042 MPa and EL: 14 %)。
英文摘要 Ti-7.5Mo alloy, developed from CMRT Lab, had been acquired the U.S. Patent (U.S. Patent No. 6409852) in 1999. It is a potential alloys for medical device. Ti-7.5Mo performed different thermomechanical treatment in this work to discuss effect on the mechanical properties, microstructure and precipitated phase.
Experimental results indicate that after hot rolling and then performing solution-treatment at T1℃ for t1, Ti-7.5Mo comprised primarily of a metastable α” phase also with a fine, acicular martensitic morphology. The bending modulus is 55GPa; the tensile modulus is 70GPa. It is similar to as-cast Ti-7.5Mo in microstructure, primarily phase and modulus.
In this work, Ti-7.5Mo after solution-treatment at T1℃ for t1 and then aging at T3℃ for t2 followed by air cooling has similar mechanical properties(YS: 871 MPa、UTS: 1042 MPa and EL: 14 %) to Ti-6Al-4V.

論文目次 ABSTRACT 1
中文摘要 2
誌謝 3
CATALOG 4
FIGURE CATALOG 9
TABLE CATALOG 14
SYMBOLS IN THIS WORK 15
CHAPTER 1 INTRODUCTION 17
1-1 INTRODUCTION OF TITANIUM 17
1-2 INTRODUCE OF TITANIUM ALLOYS 19
1-3 CLASSIFICATION OF TITANIUM ALLOYS 21
1-4 GRADES OF TITANIUM ALLOYS 22
1-5 THE DEFINITION OF BIOMATERIALS 24
1-6 CLASSIFICATION OF BIOMATERIALS 25
Ceramics materials 25
Biopolymers 26
Biocomposite 26
Metallic materials 27
Stainless steels 31
Co-based alloys 33
Pure Titanium 36
CHAPTER 2 BASIC THEORIES AND PAPER REVIEW 40
2-1 CLASSIFICATION OF TITANIUM ALLOYS 40
Alpha -alloys 42
Alpha & Beta alloys 43
Beta-alloys 43
2-2 WOLFF'S LAW 46
2-3 STRESS-SHIELDING EFFECT 46
2-4 MECHANISMS OF STRENGTHENING IN METALS 49
Strengthening by grain size reduction 50
Solid-solution strengthening 50
Strain hardening 51
2-5 HEAT TREATMENT 52
Solution heat treatment 52
Aging heat treatment 53
CHAPTER 3 EXPERIMENTAL METHODS AND MATERIALS 55
3-1 EXPERIMENTAL PROCEDURE 55
3-2 MATERIALS 56
3-3 ALLOYS MELTING AND CASTING 56
3-4 HOT ROLLING PROCESS 59
3-5 HEAT TREATMENT 60
3-6 THREE POINT BENDING TEST 61
3-7 TENSILE TEST 63
3-8 XRD PHASE ANALYZE 64
3-9 SURFACE ETCHING 64
3-10 MICROHARDNESS TEST 64
3-11 SCANNING ELECTRON MICROSCOPE (SEM) 65
CHAPTER 4 RESULTS AND DISCUSSION 66
4-1 AFTER HOT ROLLING, PERFORM DIRECT AGING AT T3℃ FOR DIFFERENT TIME WITHOUT SOLUTION-TREATMENT 66
4-1-1 Optical micrographs and X-ray diffraction profile analysis 66
4-1-2 tensile mechanical properties of directly aging at T3℃ for different time without solution-treatment 71
4-2 AFTER HOT ROLLING, PERFORM THE SOLUTION-TREATMENT FOR DIFFERENT TIME AND TEMPERATURE 74
4-2-1 optical micrographs and X-ray diffraction profiles analysis 74
4-2-2 bending properties of Ti-7.5Mo after solution-treatment for different time and temperature 81
4-2-3 the tensile mechanical properties of Ti-7.5Mo after solution-treatment at T1℃ for different time 85
4-2-4 SEM fractographs of Ti-7.5Mo after solution-treatment at T1℃ for different time 87
4-3 SOLUTION-TREATMENT AT T1℃ FOR T1 AND THEN AGING HEAT TREATMENT AT T3℃ FOR DIFFERENT TIME FOLLOWED BY AIR COOLING 89
4-3-1 optical micrographs and X-ray diffraction profile analysis 90
4-3-2 The tensile mechanical properties of Ti-7.5Mo after aging at T3℃ for different time followed by air cooling 96
4-4 AFTER HOT ROLLING, PERFORM AGING AT T3℃ FOR T2 FOLLOWED BY DIFFERENT COOLING METHODS 98
4-4-1 optical micrographs and X-ray diffraction profiles analysis 98
4-4-2 Tensile mechanical properties of Ti-7.5Mo after aging at T3℃ for t2 followed by differently cooling methods 105
4-4-4 SEM fractographs of the solution-treatment at T1℃ and the aging at T3℃ 108
4-5 MICROHARDNESS ANALYSIS 112
CHAPTER 5 CONCLUSIONS 114
CHAPTER 6 REFERENCE 115
自述 120
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