研究生: |
李政旻 Cheng-min Lee |
---|---|
論文名稱: |
鋯基金屬玻璃薄膜應用於Ti6Al4V合金與316L不鏽鋼疲勞性質提升機制之研究 Fatigue Property Improvements of Ti6Al4V and 316L Stainless Steel by Coating with Zr-based Thin Film Metallic Glass |
指導教授: |
朱瑾
Jinn Chu |
口試委員: |
鄭憲清
Jason Shian-ching Jang 黃志青 J.C.Huang 李志偉 Jyh-wei Lee 薛承輝 Chun-hway Hsueh 趙振綱 Ching-kong Chao 林原慶 Y.C. Lin |
學位類別: |
博士 Doctor |
系所名稱: |
應用科技學院 - 應用科技研究所 Graduate Institute of Applied Science and Technology |
論文出版年: | 2013 |
畢業學年度: | 102 |
語文別: | 英文 |
論文頁數: | 120 |
中文關鍵詞: | 金屬玻璃薄膜 、鈦合金 、316L不鏽鋼 、四點抗彎疲勞性質 、拉伸疲勞性質 |
外文關鍵詞: | Thin film metallic glasses, Ti6Al4V, 316L stainless steel, Four-point bending fatigue, Tension fatigue test. |
相關次數: | 點閱:291 下載:1 |
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金屬玻璃薄膜具有優良的機械性質如高強度、硬度,且具有可撓性,近十年來已有大量的研究投入金屬玻璃薄膜的應用。例如鋯基金屬玻璃薄膜已被應用於在各類合金如316L不鏽鋼、鎳機合金等的表面改質上以提升其疲勞性質。這對於金屬玻璃薄膜在疲勞性質上的影響是一個重大的發現。鈦合金(Ti6Al4V)在航太工業與醫療器具上已被廣泛使用,例如航空器零件及生醫上植入人體之組織,因此本研究進一步利用鋯基金屬玻璃膜應用在鈦合金上改善其表面性質以提升其疲勞特性。本研究中將鈦合金切割成3x3x25 釐米,以濺鍍的方式在試片表面鍍上200奈米的鋯基薄膜,利用四點抗彎測試比較鍍膜與未鍍膜試片的疲勞壽命。實驗結果顯示在675 MPa應力下,Ti6Al4V合金疲勞壽命由未鍍膜的 3.1x10^5 次,鍍膜後提升至5.3x10^6 次,疲勞壽命提升約17.3倍。疲勞限強度由未鍍膜之575 MPa增加到鍍膜後675 MPa。相同厚度的TiN陶瓷硬膜對於疲勞性質的提升沒有金屬玻璃薄膜來得明顯。
另一方面,在本研究中鋯基金屬玻璃薄膜也應用在316L不鏽鋼拉伸疲勞測試,結果顯示,不鏽鋼標準拉伸試驗棒在350 MPa應力下,鍍有500奈米的不鏽鋼其疲勞壽命由原先未鍍膜2.3 x 10^5次增加到6.0 x 10^6次,明顯提升25倍。
濺鍍鋯基薄膜後Ti6Al4V合金與不鏽鋼疲勞壽命明顯增加,可歸功於幾項主要原因:鋯基金屬玻璃具有延展性等優異的機械性質,對於基材而言為一硬膜保護層,疲勞試驗中能阻止缺陷在表面生成與傳播。濺鍍薄膜後基材表面粗糙度改善,因此減少缺陷在表面成核成長機會。然而薄膜與基材間的附著力也扮演關鍵性的角色,有良好的附著性薄膜,優良的性質才能在基材上表現出來,進而提升基材疲勞性質。在本論文中我們亦將提出提升疲勞性質的機制,藉由FIB與TEM等各項儀器的分析了解薄鍍層的特性。
In this study, we propose the use of the Zr-based thin film metallic glass (TFMG) as a promising coating for enhancing fatigue property of Ti6Al4V alloy and 316L stainless steel. 200 nm-thick Zr50Cu27Al16Ni7 and TiN thin films are prepared by sputtering on Ti6Al4V substrate. The four-point bending fatigue life is improved from 3.1 x 10^5 cycles for the uncoated sample by ~17.3 times to 5.3 x 10^6 cycles at a stress level of 675 MPa. The improvement in fatigue limit increases from 575 to 675 MPa as well. TFMG has a better performance than the TiN coating. On the other hand, the fatigue life of tension-tension fatigue 316L stainless steel is increased by ~25 times from 2.3 x 10^5 cycles of the bare sample to 6.0 x 10^6 cycles of TFMG coated sample at a loading stress of 350 MPa. The fatigue property improvements could be attributed to the several reasons, for instance, good mechanical property of Zr-based TFMG, specifically high strength and flexibility. After coating, Zr-based TFMG yields a decrease in surface roughness of substrates, hence reducing the crack initiations and propagations on the surface. Furthermore, the good adhesion property of TFMG also plays an important role. The mechanism of the film to prolong the fatigue life is examined by FIB and TEM. It has been proven that the coatings restrain the defects propagate to the surface during the fatigue cycles. The above-mentioned are the key factors that improve the fatigue resistance of the coated materials. Thus, this study demonstrates the metallic glass film as a promising coating material for improving the fatigue properties of materials.
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