鋯基與鋯銅基金屬玻璃薄膜應用於7075-T6航空用鋁合金疲勞性質提升之研究

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張益綜(Yi-zong Zhang) 查詢紙本館藏

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論文名稱

鋯基與鋯銅基金屬玻璃薄膜應用於7075-T6航空用鋁合金疲勞性質提升之研究
(Zr-based and Zr-Cu based Glass-forming Films for Fatigue-property Improvements of 7075-T6 Aluminum Alloy)

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摘要(中)

本研究中將探討鋯基與鋯銅基金屬玻璃薄膜應用於7075-T6高強度鋁合金疲勞性質提升之研究。在鋁合金試片上濺鍍一層厚度為200nm的（Zr53Cu30Ni9Al8）99.5Si0.5與（Zr42Cu42Al8Ag8）99.5Si0.5薄膜，及鋁合金試片在三種條件下分別進行疲勞測試，鋯基鍍膜與鋯銅基鍍膜的鋁合金疲勞壽命在250 MPa的應力下分別為5.0×106次與 >107次，相較於未鍍膜的鋁合金試片分別提升了21.7倍與44.5倍。另外在疲勞限應力上之表現，則分別提升了56.7 %與66.7 %。由上述結果可以得知金屬玻璃薄膜對鋁合金疲勞性質有顯著的提升功效。再者，表面粗糙度、薄膜在基板上的附著力、薄膜本身的機械強度與硬度以及壓縮殘留應力對疲勞性質的提升存在關鍵性的影響。經由SEM觀察發現非晶質鍍膜能有效的抑制offset及裂隙在基板張力面的形成。相較於鋯基鍍膜，鋯銅基鍍膜具有較佳的抗疲勞能力，在250 MPa的應力下，疲勞壽命約為鋯基鍍膜的2倍，此乃由於鋯銅基鍍膜的硬度、強度均較高且具較佳的塑性，所以對於疲勞性質之提升略優於鋯基鍍膜。在本論文中我們也藉由各項儀器的分析來了解超薄鍍膜的特性並建立金屬玻璃鍍膜提升疲勞性質的機制；希望進一步將金屬玻璃鍍膜推廣應用到航太、汽車工業、自行車等交通器械之疲勞性質的提升。

摘要(英)

We proposed with the Zr-based and Zr-Cu based metallic glass thin film (MGTF) as promising coating for aluminum alloy fatigue property enhancement. According to the four-point-bending fatigue results, 7075-T6 aluminum alloy with a 200-nm-thick Zr-based MGTF improved its fatigue life cycle 22 times at a stress level of 250 MPa than the bare one. And the other fatigue life cycle of Zr-Cu based MGTF is further improved 44 times which ups to 107 cycles. The improvements of MGTF coating samples in fatigue limit were 235 MPa (56.7 % increase) and 250 MPa (66.7 % increase) for Zr-based and Zr-Cu based glass-forming film, respectively, and 150 MPa for uncoated sample. The films actually restrict the surface offsets and cracks propagating during the fatigue test. Zr-Cu based glass-forming film have better fatigue resistance than Zr-based MGTF, the fatigue life had improved by more than 2 times under a stress of 250 MPa, due to higher hardness and strength, better plasticity, thus it exhibits better improvement in fatigue property. A 50-nm-thick Titanium buffer layer between the film and the substrate was reported adhesion enhancement. The superior mechanical properties of MGTF, such as high strength and good bending ductility, coupled with good adhesion between the film and the substrate as well as the reduced surface roughness, and high compressive residual stress of the metallic film yield the fatigue property improvement of aluminum alloy. Thus demonstrating MGTF as promising coating materials for improving the fatigue properties of materials, and further applied to aerospace, automobile industry and bicycle manufacturing etc.

關鍵字(中)

★ 金屬玻璃薄膜
★ 真空濺鍍
★ 附著性
★ 四點彎曲
★ 疲勞性質

關鍵字(英)

★ MGTF
★ Vacuum Sputtering
★ Adhesion
★ Four-Point-Bending
★ Fatigue Property

論文目次

中文摘要......................................................................................................................................i
英文摘要.....................................................................................................................................ii
總目錄........................................................................................................................................iii
圖目錄........................................................................................................................................vi
表目錄.........................................................................................................................................x
第一章　前言.............................................................................................................................1
1-1　研究動機..........................................................................................................................1
1-2　研究目的..........................................................................................................................2
第二章　理論基礎.....................................................................................................................4
　　2-1　塊狀非晶質合金........................................................................................................4
　　　2-1-1　非晶質合金概述.................................................................................................4
2-1-2　非晶質合金發展歷程..................................................................................................5
2-1-3　非晶質合金形成準則..................................................................................................8
　　　2-1-4　非晶質合金製備方式.........................................................................................9
　　2-2　塊狀非晶質合金的特性..........................................................................................11
　　　2-2-1　機械性質...........................................................................................................11
　　　2-2-2　耐腐蝕性...........................................................................................................12
　　　2-2-3　磁性質...............................................................................................................13
　　　2-2-4　其他性質...........................................................................................................13
　　　2-2-5　非晶質合金之應用...........................................................................................14
　　2-3　非晶質合金的變形機制..........................................................................................14
　　　2-3-1　剪切轉變區(Shear Transformation Zones, STZs)..............................................14
　　　2-3-2　剪切帶(Shear Bands).........................................................................................15
　　2-4　非晶質薄膜(Metallic Glass Thin Film, MGTF).........................................................16
　2-4-1　附著性質...................................................................................................................17
　　　2-4-2　奈米壓痕薄膜硬度...........................................................................................17
　　2-5　物理氣相沉積..........................................................................................................18
　　　2-5-1　直流磁控濺鍍...................................................................................................19
　　　2-5-2　薄膜沉積原理...................................................................................................20
　　2-6　高強度鋁合金(7075-T6)..........................................................................................22
　　2-7　四點彎曲疲勞..........................................................................................................22
　　　2-7-1　鍍層對疲勞性質的改善...................................................................................22
第三章　實驗步驟....................................................................................................................24
　　3-1　靶材合金製備與試片前處理...................................................................................24
　　　3-1-1　靶材合金原料之配製........................................................................................24
　　　3-1-2　真空電弧熔煉(Arc-melting)...............................................................................25
　　　3-1-3　真空吸鑄製程(Drop-Casting).............................................................................25
　　　3-1-4　鋁合金試片製備與前處理................................................................................26
　　3-2　金屬玻璃薄膜製備...................................................................................................26
　　　3-2-1　直流磁控濺鍍(DC Magnetron Sputtering).........................................................26
　　3-3　機械性質分析...........................................................................................................27
　　　3-3-1　刮痕測試(Scratch Test)......................................................................................27
　　　3-3-2　奈米壓痕硬度量測(Nanoindentation Test)........................................................27
　　　3-3-3　疲勞測試(Fatigue Test)......................................................................................27
　　3-4　微觀組織分析...........................................................................................................28
　　　3-4-1　X光繞射分析(XRD)..........................................................................................28
　　　3-4-2　原子力顯微鏡分析(AFM).................................................................................28
　　　3-4-3　掃描式電子顯微鏡(SEM)觀察與能譜元素分析(EDS)....................................29
　　　3-4-4　穿透式電子顯微鏡(TEM).................................................................................29
第四章　結果與討論................................................................................................................30
　　4-1　成分分析...................................................................................................................30
　　　4-1-1　能量分散質譜儀(Energy dispersive spectrometry-EDS)....................................30
　　4-2　晶體結構分析...........................................................................................................31
　　4-3　薄膜刮痕附著力試驗...............................................................................................31
　　4-4　原子力顯微鏡表面分析...........................................................................................31
　　4-5　機械性質分析...........................................................................................................32
　　　4-5-1　奈米壓痕硬度量測............................................................................................32
　　　4-5-2　四點彎曲疲勞試驗............................................................................................35
　　4-6　SEM破斷面與微組織分析........................................................................................35
　　4-7　TEM觀察分析............................................................................................................35
第五章　結論.............................................................................................................................36
第六章　參考文獻.....................................................................................................................89

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指導教授

鄭憲清(Jason Shian-Ching Jang)

審核日期

2011-7-26

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