鋯基與鈦基金屬玻璃薄膜應用於7075-T6航空用鋁合金疲勞性質改善之研究

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柯俊宏(Jun-hong Ke) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

鋯基與鈦基金屬玻璃薄膜應用於7075-T6航空用鋁合金疲勞性質改善之研究
(Zr-based and Ti-based Metallic Glass Thin Film Coatings for Fatigue-Property Improvement of 7075-T6 Aluminum Alloy)

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摘要(中)

本研究探討7075-T6高強度鋁合金基材披覆鋯基（Zr53Cu30Ni9Al8）99.5Si0.5與鈦基(Ti40Zr10Cu36Nb7Co7)金屬玻璃薄膜應用於抗疲勞性質改善之研究。首先，我們探討鋯基金屬玻璃薄膜厚度對於7075-T6鋁合金疲勞之效果，選擇一最佳膜厚再與相同膜厚之鈦基金屬玻璃進行比較，以研究不同系統之金屬玻璃薄膜成分對於其疲勞性質之影響。而實驗結果發現鋯基金屬玻璃薄膜厚度提升其疲勞性質改善會逐漸減退，疲勞限由披覆200 nm之235 MPa至500 nm之205 MPa明顯降低，這是由於表面粗糙度逐漸提升所導致。此外，濺鍍200 nm鋯基與鈦基金屬玻璃薄膜之疲勞限相較於鋁合金基材提升56.7 %與43.3 %，在250 MPa之交變應力下，鋯基與鈦基金屬玻璃薄膜之疲勞壽命則分別為5.4×10^6次與1.6×10^6次，相較於鋁合金基材之2.0×10^5次高出近26.3倍與7.9倍，而披覆200 nm厚之鋯基金屬玻璃薄膜在表面粗糙度與附著性皆優於鈦基金屬玻璃，因此披覆200 nm之鋯基金屬玻璃為7075-T6鋁合金抗疲勞鍍膜之最佳選擇。

摘要(英)

Due to the high specific ratios of strength to weight of 7075 aluminum alloy, it is widely used in light weight sport equipment, automobile bodies, and aircraft frames. However, the 7075 aluminum alloy has poor fatigue property in comparison to steel. In this study, different thicknesses (namely 200, 300, 400, and 500 nm) of Zr-based ((Zr53Cu30Ni9Al8)99.5Si0.5) and 200 nm Ti-based (Ti40Zr10Cu36Nb7Co7) metallic glass thin films (MGTF) were successfully coated on the 7075 aluminum alloy substrates by DC-sputtering method. Then the fatigue properties of these coated and as-polished samples were tested following the standard of ASTM-C1161-02c. The results revealed that the fatigue life and fatigue strength show an opposite trend with increasing the thickness of MGTF due to the changes of surface roughness and residual stress. The sample coated with 200-nm-thick Zr-based MGTF is found to have the best fatigue properties than others thickness-coated samples. Moreover, the fatigue life of 7075-T6 aluminum alloy can be improved about 26.3 and 7.9 times than the bare one at the high stress level of 250 MPa by coating with 200 nm-thick Zr-based and Ti-based MGTF. In parallel, the improvements of Zr-based and Ti-based MGTF-coated samples in fatigue strength were 235 MPa (56.7 %) and 205 MPa (43.3 %) compared with as-polished sample (150 MPa).
Based on the TEM examination, the formation of offsets and cracks from the surface of specimen was revealed to be effectively restricted by both MGTF coatings. This is attributed to the high strength, good flexibility, and strong adhesion of both MGTF coatings, which can provide effective compressive stress to suppress the slip band protruding. In summary, Zr-based MGTF coating is believed to be a promising coating material for improving 7075-T6 aluminum fatigue properties.

關鍵字(中)

★ 金屬玻璃薄膜
★ 四點彎曲
★ 疲勞性質
★ 7075鋁合金

關鍵字(英)

★ Metallic Glass Thin Film
★ Four-Point-Bending
★ Fatigue
★ 7075 Aluminum Alloy

論文目次

總目錄
摘要 I
Abstract II
表目錄 VI
圖目錄 VII
第一章前言 1
1-1 研究動機 1
1-2 研究目的 4
第二章理論基礎與概論 5
2-1 塊狀金屬玻璃 5
2-1-1 金屬玻璃（非晶質合金）概述 5
2-1-2 非晶質合金的發展歷程 7
2-2 金屬玻璃實驗歸納法則 9
2-2-1 金屬玻璃形成準則 9
2-2-2 玻璃形成能力 11
2-3 金屬玻璃製程簡介 12
2-4 金屬玻璃之特性與應用 15
2-4-1 機械性質 15
2-4-2 抗腐蝕性與抗菌性 16
2-4-3 磁性質 16
2-4-4 其他性質 17
2-4-5 塊狀金屬玻璃之應用 17
2-5 金屬玻璃薄膜 18
2-5-1 濺鍍原理 18
2-5-2 金屬玻璃薄膜 19
2-6 7075-T6鋁合金 21
2-7 疲勞破壞基礎理論 21
第三章實驗步驟與方法 33
3-1 靶材製備與鋁合金試片前處理 33
3-1-1 靶材合金元素配製 33
3-1-2 真空電弧熔煉 34
3-1-3 墜落式鑄造製程 34
3-2 疲勞試片製備 35
3-2-1 7075-T6鋁合金基材試片製備 35
3-2-2 金屬玻璃薄膜披覆 36
3-3 機械性質分析 36
3-3-1 刮痕測試與附著力測試 36
3-2-2 奈米壓痕試驗 37
3-2-3 殘留應力分析 37
3-2-4 疲勞測試 39
3-4 微觀組織分析 40
3-4-1 低掠角X光繞射儀 40
3-4-2 原子力顯微鏡 40
3-4-3 掃描式電子顯微鏡與能量散佈光譜儀分析 41
3-5 熱性質分析 42
第四章結果與討論 57
4-1 成分分析 58
4-2 薄膜結構分析 58
4-3 薄膜厚度觀察 58
4-4 表面粗糙度測試 59
4-3 薄膜與基材間附著力測試 59
4-4-1 膠帶測試 60
4-4-2 刮痕測試 60
4-5 薄膜硬度測試 61
4-6 殘留應力分析 61
4-7 熱性質分析 62
4-8 四點彎曲疲勞測試 62
4-9 疲勞破斷觀察 63
4-9-1 試片破斷面觀察 63
4-9-2 試片頂部觀察 64
4-9-3 薄膜剝落位置觀察 64
第五章結論 89
第六章參考文獻 90

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2015-7-13

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