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研究生： 許博淵
Shu, Po-Yuan
論文名稱： 熱機處理對Ti-7.5Mo合金結構與機械性質之影響
Effect of thermomechanical treatment on structure and mechanical properties of Ti-7.5Mo alloys
指導教授： 朱建平
Ju, Chien-Ping
陳瑾惠
Chern Lin, Jiin-Huey
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 中文
論文頁數： 106
中文關鍵詞： Ti-7.5Mo合金 、熱機處理 、機械性質
外文關鍵詞： Ti-7.5Mo alloy, thermomechanical treatment, mechanical properties
相關次數： 點閱：71  下載：1 
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    • 本實驗藉由對Ti-7.5Mo合金進行不同的熱機處理，探討其微結構與機械性質的關係，Ti-7.5Mo在經過T1℃熱滾壓t1分鐘後空冷，呈現α’相與商用Ti-6Al-4V (ELI)有較相近之拉伸性質，降伏強度為777MPa、最大拉伸強度為1093MPa、伸長11%、彈性模數為104GPa，而經過固溶處理後，其強度大幅下降，但伸長量大幅提升，其性質較趨近於Ti-7.5Mo as cast。
    Ti-7.5Mo合金在熱滾壓固溶處理後冷滾壓再時效，時效溫度T2℃，時效時間t8分鐘～t12分鐘，呈現α"相，其拉伸強度都較熱滾壓後固溶高，且隨著時效溫度與時效時間的增加，其強化效果越強。而進行時效溫度T2℃，t11分鐘之時效熱處理，降伏強度為935MPa、最大拉伸強度為1021MPa、伸長20%、彈性模數為92GPa，與商用Ti-6Al-4V (ELI)相比，有更好的強度、延性及較低的彈性模數。

    In this study, the influence of microstructures on mechanical properties of Ti-7.5Mo alloy after different thermomechanical treatment is discussed. The results indicated that Ti-7.5Mo alloy, which was hot rolled at T1℃ for t1 minutes and followed by air-cooling, consists of α’ phase. The tensile properties of Ti-7.5Mo alloy after treatment are similar to that of commercial Ti-6Al-4V (ELI), including its yield strength (777MPa), maximum tensile strength (1093MPa), elongation (11%), and elastic modulus (104GPa). However, the tensile strength of Ti-7.5Mo alloy declines largely but its elongation substantially increases after solution treatment, which is considerably similar to as-cast Ti- 7.5Mo.
    Ti-7.5Mo alloy after solution heat treatment was subsequently cold rolled, and followed by aging at T2℃ for t8~ t12 minutes. The alloy on which aging treatments has been conducted contains α" phase. The tensile strength of Ti-7.5Mo alloy increases after aging process, which is obviously detected when the aging time extends. Compared with commercial Ti-6Al-4V (ELI), the alloy aging at T2℃for t11 minutes has better yield strength (935MPa), maximum strength (1021MPa), elongation (20%), but lower elastic modulus (92GPa).

    摘要 I Abstract II 誌謝 III 總目錄 IV 圖目錄 IX 表目錄 XIII 第一章 前言 1 1-1 生醫材料的介紹 1 1-2 金屬生醫材料之介紹 2 1-2-1 316L不鏽鋼 2 1-2-2 鈷基合金 3 1-2-3 鈦基合金 4 1-3 金屬生醫材料之應用 5 1-3-1 人工關節 7 1-3-2 人工牙根 8 1-3-3 骨折固定 10 1-4 研究目的 13 第二章 鈦及鈦合金 15 2-1 鈦元素的介紹 15 2-1-1 鈦的起源 15 2-1-2 鈦的物理性質 16 2-1-3 鈦的化學性質 17 2-2 鈦的製備 18 2-2-1 亨特(Hunter)法 19 2-2-2 Crystal bar process 20 2-2-3 克羅爾(Kroll)法 21 2-2-4 FFC劍橋法 22 2-3 鈦合金的分類 24 2-3-1 α或near α型鈦合金 25 2-3-2 β型鈦合金 27 2-3-3 α＋β型鈦合金 32 2-4 鈦合金的非平衡相 33 2-5 鈦與鈦合金的性質與應用 35 第三章 理論基礎 39 3-1 鈦合金之設計理論 39 3-1-1 分離式多樣化叢集方式 39 3-1-2 電子結構的分子軌域計算 40 3-1-3 Mo當量方程式 41 3-2 金屬的強化機制 42 3-2-1 細晶粒強化 43 3-2-2 加工硬化 43 3-2-3 固溶強化 45 3-2-4 析出強化 46 3-3 拉伸破斷機制 51 3-3-1 脆性破斷 52 3-3-2 延性破斷 53 第四章 實驗步驟及方法 55 4-1 實驗流程圖 55 4-2 合金材料的製備 56 4-3 合金熔煉與鑄造 56 4-4 合金鑄造及儀器 59 4-5 滾壓製成 60 4-6 試片製作 62 4-7 固溶熱處理 62 4-8 時效熱處理 63 4-9 拉伸試驗 63 4-10 微硬度試驗 64 4-11 X光繞射相分析 66 4-12 金相組織觀察 67 4-13 掃描式電子顯微鏡分析 68 第五章 實驗結果與討論 69 5-1 Ti-7.5Mo、純鈦、Ti-6Al-4V ELI 性質比較 69 5-1-1 拉伸強度與彈性模數 70 5-1-2 Ti-7.5Mo合金的相組成 72 5-2 熱壓後直接固溶結果與分析 73 5-2-1 合金的相組成 74 5-2-2 金相觀察 75 5-2-3 拉伸強度與彈性模數 77 5-2-4 微硬度測試 79 5-2-5 SEM破斷面 80 5-3 固溶後時效熱處理結果與分析 82 5-3-1 合金的相組成 83 5-3-2 金相觀察 84 5-3-3 拉身強度與拉伸彈性模數 86 5-3-4 微硬度測試 87 5-3-5 SEM破斷面 88 5-4 固溶後冷滾壓再時效熱處理結果與分析 90 5-4-1 合金的相組成 91 5-4-2 金相觀察 92 5-4-3 拉身強度與拉伸彈性模數 95 5-4-4 微硬度測試 97 5-4-5 SEM破斷面 98 第六章 結論 102 第七章 參考資料 103

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