博碩士論文 100323033 詳細資訊




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姓名 張永憲(Yung-hsien Chang)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 不同製程對鋯基非晶質合金破裂韌性影響之研究
(Study of the cast process effect on the fracture toughness of Zr based bulk amorphous alloys)
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摘要(中) 近幾年來,由於工業快速發展,使得材料的耐用度成為很重要一門課題,因而衍生出利用三點彎曲來測試評估材料對於裂縫抵抗能力,做為材料在結構設計上之依據。
由於鋯基非晶質合金具有良好的玻璃形成能力及抗壓縮機械性質,且因添加矽元素於鋯基非晶質合金系統中可提升玻璃形成能力與其熱穩定性,因此本研究選用無矽及含矽之鋯基非晶質合金作為主要基材,同時本研究藉由傾倒式鑄造(Tilt-casting)及墜落式鑄造(Suction-casting)製程來製作Zr53Cu30Ni9Al8、Zr48Cu36Al8Ag8、(Zr53Cu30Ni9Al8)99.25Si0.75與(Zr48Cu36Al8Ag8)99.25Si0.75等鋯基系列塊狀合金,並依據ASTM E399規範之三點彎曲測試,來探討該系列合金之破裂韌性。
以傾倒式鑄造製備之非晶質試片,其破裂韌性較墜落式鑄造製備的試片來的高,若以鋯基與添加矽之鋯基非晶質合金來看,鋯基(Zr53Cu30Ni9Al8)合金具有最佳破裂韌性,其值約120 MPa•√m,相對另一鋯基(Zr48Cu36Al8Ag8)合金其值則降為68 MPa•√m。另外添加Si元素之鋯基,非晶質合金其破裂韌性值均較未添加Si的非晶質合金來的低, (Zr53Cu30Ni9Al8)99.25Si0.75) 及((Zr48Cu36Al8Ag8)99.25Si0.75)非晶質合金之破裂韌性值分別為107 MPa•√m及34.4 MPa•√m;本研究同時也探討塊狀金屬玻璃之破裂能量(Rupture energy)與浦松比(Poissionʼs ratio)、剪切模數(Shear modulus)及對應溫度之關係。其中Zr53Cu30Ni9Al8具有較高破裂韌性(K1C)、破裂能量(J)、浦松比(ʋ,Poissionʼs ratio)、較低剪切模數(μ,Shear modulus)及彈性係數,其值分別為:120 MPa√m、155 kJm-2、0.373、30 GPa、83 GPa。
摘要(英) In recent years, due to the rapid development of industry, the endurance of materials becomes a major issue on each kinds of industrial product. Therefore, the evaluation of crack resistance ability by three-point bending test is applied as the reference of structure design.
Zr-based bulk amorphous alloys (BAA) possess good engineering properties and its glass forming ability can be adjusted via minor-alloying of silicon element. Therefore, these two Zr53Cu30Ni9Al8 and Zr48Cu36Al8Ag8 Zr-based amorphous alloys are selected for this study. Both bulk amorphous alloys (BAA) plates were fabricated by tilt-casting and suction-casting. Then these bulk amorphous alloys (BAA) plates were followed ASTM E399 to machine into the three-point bending specimens for investigate their fracture toughness.
Experimental results revealed that tilt-casting (Zr53Cu30Ni9Al8) specimen possess the best fracture toughness among all specimens in this study and reaches value about 120 MPa√m. On the other hand, the calculate fracture energy and Poisson’s ratio show same trend to prove tilt-casting Zr-53 owns the best mechanical properties.
關鍵字(中) ★ 三點彎曲
★ 破裂韌性
★ 非晶質合金
關鍵字(英) ★ Three point bending
★ Fracture toughness
★ Amorphous alloy
論文目次 中文摘要I
英文摘要III
致謝IV
總目錄VI
表目錄IX
圖目錄X
第一章 研究背景1
1-1前言1
1-2 研究動機2
第二章 理論基礎3
2-1 非晶質合金概述3
2-2非晶質合金的發展歷程4
2-3 實驗歸納法則8
2-4 非晶質製造方法9
2-5 非晶質特性11
2-5-1 機械性質12
2-5-2 強度韌性13
2-5-3 耐腐蝕性13
2-6非晶質熱力學14
2-6-1非晶質平衡介穩態14
2-6-2 玻璃轉換溫度(Tg)16
2-6-3 玻璃形成能力指標(GFA)17
2-6-3-1 簡化玻璃溫度17
2-6-3-2 γ值及γm值17
2-7破裂韌性18
第三章 實驗步驟27
3-1 實驗目的27
3-2 合金配置28
3-3合金熔煉28
3-3-1 電弧熔煉28
3-3-2 板材製作29
3-4 熱性質分析29
3-5 微觀組織分析30
3-5-1 X光繞射儀30
3-5-2 掃描式電子顯微鏡(SEM)30
3-6 機械性質測試31
3-6-1 破裂韌性量測(三點彎曲測試)31
3-6-2 非破壞性檢測(超音波測試)32
3-6-3硬度測試33
第四章 結果與討論42
4-1 為結構分析42
4-1-1結晶結構分析42
4-2 熱性質分析43
4-3 機械性質分析45
4-3-1 微硬度分析45
4-3-2 缺陷分析(孔隙率)46
4-3-3 超音波測試(Ultrasonic testing)47
4-3-4 破裂韌性(KQ)48
4-3-5 破裂能量(J)49
4-4 SEM破斷面與Notch觀察50
4-4-1 開口(Notch)端剪切帶之觀察51
4-4-2 破斷面(cross section)之觀察52
第五章 結論82
第六章 參考文獻84
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指導教授 鄭憲清(Jason Shian-Ching Jang) 審核日期 2013-7-25
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