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標題: | 高熵合金Fe-Co-Ni-Cr-Al-Mn (-0.1Mo)之高溫氧化與潛變分析研究 The Study of High Temperature Oxidation and Creep Property of Fe-Co-Ni-Cr-Al-Mn (-0.1Mo) High Entropy Alloy |
作者: | Ming-Chu Chuang 莊旻洲 |
指導教授: | 顧鈞豪 |
關鍵字: | 高熵合金,氧化,潛變,顯微結構, High Entropy Alloy,oxidation,creep, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 一般傳統工業所應用之合金組成皆以二到三種主要元素為主,但高熵合金擴展了傳統合金以單一元素為主體的觀念,其主要組成為一種包含了四或五個以上主元素的合金系統。此種新穎的合金概念,將可以發展出無數種的未知性質之合金,部分合金可能因為具有特殊的顯微結構而有優異的機械及物理性質,值得學術及工業界開發研究。
經由先前研究可知,特定成分之高熵合金具有奈米級之顯微結構及許多優異的材料特性:例如熱穩定性、抗腐蝕性、抗高溫氧化性、抗潛變性等,這些優異的材料特性使得高熵合金的發展與應用備受矚目。此外,亦有研究顯示,多元高熵合金可藉濺鍍製成薄膜。由於高熵合金之各種電、磁、光等特性,將使高熵合金的運用更加廣泛。 本研究選定Fe、Co、Ni、Cr、Al、Mn六種元素作為實驗的合金系統,此外亦選用Mo作為微量添加元素,配製等莫耳(每一元素添加的莫耳數相等,稱為1份)合金與個別元素減半(稱為0.5份)的非等莫耳合金,並且亦以探究活潑元素鋁之含量對高熵合金特性之影響,配製不同Al含量的非等莫耳合金,作為比較。 由於此一領域甚廣,具有極豐富之研究價值及發展運用,本研究將僅針對FeCoNiCrAlMn 此六種合金元素所組成之高熵合金,進行700℃以上的高溫潛變性質及高溫氧化行為之研究。本研究先觀察此自配高熵合金之顯微結構並鑑定各相成份,並進行高溫潛變及高溫氧化試驗,觀察於高溫時此合金之顯微結構變化,並對其氧化層進行分析研究。 氧化試驗後由EDS分析氧化物表面型態及XRD繞射試驗分析中發現,氧化物生成物主要為Mn、Al及Cr氧化物,FeCoNiCrAlMn六元高熵合金鋁含量增加時,抗高溫氧化的效果明顯提升。 FeCoNiCrAl0.5Mn合金在700℃ 、800℃的潛變曲線,可看出相同溫度時,施加的應力越大,合金的抗潛變性隨之變化,溫度上升時潛變的壽命大幅下降、潛變破斷伸長量有明顯的上升,而由潛變破斷面的型態觀察,破壞型態幾乎為延性破壞,劈裂破壞並不明顯,是合金產生動態再結晶和晶粒形狀改變的結果。 The recent developments of high-entropy alloys brought the research of conventional metallic materials into brand-new field. High-entropy alloys differ from the other traditional alloys with only two or three major elements. These innovative alloys contain five or more major elements and may change some of the traditional alloy’s concepts radically. A lot of unknown alloys would be developed from this novel alloys concepts; and some of those high-entropy alloys would possess excellent mechanical and physical properties resulting from their special microstructure. These alloys are worth researching by academic and industrial circles. As already pointed out, the high-entropy alloys of special composition possess nano-structure with some excellent characteristics including superior thermal stability, excellent oxidation resistance and creep strength. These superior characteristics make the development and application of the high-entropy alloys more attractive. In addition, some researches showed that the multi-element high-entropy alloy is practicable on thin-film application. With their mechanical, thermal and magnetic, electric properties, the application field of high-entropy alloys will be broadened. The novel fields about high-entropy alloy possess highly research value, so high-temperature creep and oxidation tests should be conducted to study the high-entropy alloy containing Fe, Co, Ni, Cr, Al, Mn and Mo seven elements in this study. At first, the microstructure and phases of the high-entropy alloy would be identified and then the high temperature creep and oxidation tests were performed. The change of microstructure at elevated temperature and the oxidation layer would be analyzed. Finally, all kinds of properties of these alloys will be compared with the common high-temperature alloys to realize whether the high-entropy alloy could be used at an elevated temperature . |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/35399 |
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顯示於系所單位: | 材料科學與工程學系 |
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