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研究生： 陳彥辰
Yen-Chen Yen
論文名稱： CuZrTiFeCrx高熵合金之顯微結構、硬度與腐蝕之研究
Study on microstructure, hardness and corrosion of CuZrTiFeCrx high entropy alloy
指導教授： 顏怡文
Yee-Wen Yen
口試委員: 蔡哲瑋
蕭憲明
陳志銘
周賢鎧
學位類別： 碩士
Master
系所名稱： 工程學院 - 材料科學與工程系
Department of Materials Science and Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 中文
論文頁數： 75
中文關鍵詞： 高熵合金 、電化學 、硬度 、動態極化曲線
外文關鍵詞： High entropy alloy, Electrochemical, Hardness, potentiodynamic polarization
相關次數： 點閱：218  下載：1 
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    • 研究根據CuZrTi三元相圖在等莫耳情況下的相為Cu2TiZr，並添加Fe、Cr於合金系統中，合金設計為CuZrTiFeCrx(x=0,0.1,0.3,0.5,0.8及1.0，x為莫耳比)共六種組成的合金，觀察Cr元素含量的變化對合金之微結構、硬度、電化學腐蝕性質的影響。
    本實驗以電弧熔煉爐來製備銅-鋯-鈦-鐵-鉻五元合金。以場發掃描式電子顯微鏡(FE-SEM)探討顯微結構；由能量分散能譜儀(EDS)及X射線繞射儀(XRD)判定顯微結構的組成相。結果發現所有合金鑄材均為樹枝狀結構，在Cr-0與Cr-0.1合金系統中，樹枝晶狀與樹枝間晶狀均為Cu2TiZr相，在interdendrite上會產生兩種介金屬化合物的結構Cu8Zr3與FeZr2。隨著Cr含量的上升，到達Cr-0.3至Cr-1.0時，dendrite相從Cu2TiZr變為Zr(FeCr)2，在結構上同屬C14 Laves相，而interdendrite相仍維持Cu2TiZr相，介金屬相仍為Cu8Zr3與FeZr2。
    本研究探討經1小時1050°C在不同Cr含量的CuZrTiFeCrx高熵合金，於3.5wt%NaCl水溶液下，結果顯示，CuZrTiFeCrx高熵合金系統以CuZrTiFeCr1.0有最低腐蝕速率3.45×10-7(A/cm2)及較高的腐蝕電位(-0.326V)，亦即具有較好的抗蝕性。CuZrTiFeCrx高熵合金系統的硬度量測以CuZrTiFeCr1.0的硬度最高，主要是介金屬相(Fe2TiZr)的析出顆粒所造成的影響。

    關鍵詞:高熵合金、電化學、硬度、動態極化曲線

    The CuZrTi ternary phase diagram is based on Cu2TiZr in the isomeric phase, and Fe and Cr are added to the alloy system. The alloy design is CuZrTiFeCrx (x=0, 0.1, 0.3, 0.5, 0.8 and 1.0, x is Molar ratio). A total of six kinds of alloys were observed to the effect of Cr content on the microstructure, hardness, and electrochemical corrosion properties of the alloy.
    In this experiment, we used the arc melting to prepare a Cu-Zr-Ti-Fe-Cr alloys. The microstructure was investigated with a field emission scanning electron microscope (FE-SEM); the compositional phases of the microstructure were determined by energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). It was found that all the alloy castings were dendritic structure. In the Cr-0 and Cr-0.1 alloy systems, the dendritic and interdendritic were both Cu2TiZr phases. Above the interdendrite, two intermetallic compounds were Cu8Zr3 and FeZr2. With the increase of Cr content, when the Cr-0.3 to Cr-1.0 is reached, the dendrite phase changes from Cu2TiZr to Zr(FeCr)2, structurally belongs to the C14 Laves phase, and the interdendrite phase still maintains the Cu2TiZr phase. The intermetallic phase also remains Cu8Zr3 and FeZr2.
    The corrosion behavior of CuZrTiFeCrx high entropy alloys under heat treatment at 1050°C with 1 hour holding time. The corrosion resistance of the CuZrTiFeCrx specimens has been evaluated by potentiodynamic polarization. The specimen CuZrTiFe exhibits serious corrosion in 3.5wt% NaCl solution and has highest corrosion rate. Due to the Cu2TiZr is the active sensitivity zone of potential difference, the high entropy alloy was preferentially attacked along the Cu-compound phase.
    The highest hardness of CuZrTiFeCrx high entropy alloys system is CuZrTiFeCr1.0, which is mainly caused by the precipitation particles of the intermetallic phase (Fe2TiZr).

    Keywords: High entropy alloy, Electrochemical, Hardness, potentiodynamic polarization

    摘要 I Abstract II 第一章 前言 1 第二章 文獻回顧 2 2.1高熵合金發展 2 2.1.1高熵合金的發展及核心效應 2 2.1.2高熵合金的特性與應用 5 2.1.3高熵合金之機械行為 7 2.1.4變形及熱處理工藝對高熵合金組織結構的影響 8 2.1.5高熵合金之研究 11 2.2熵對合金系統的影響 13 2.3 高熵合金性質 17 2.4材料腐蝕 18 2.4.1腐蝕型態 18 2.4.2電化學測試 18 2.4.3電化學極化 20 2.4.4混合電位 21 2.4.5腐蝕速率 21 2.4.6鈍化 21 2.5研究目的 23 第三章 實驗方法 24 3.1 合金組成 24 3.2 合金製備 24 3.3 時效處裡 24 3.4 硬度分析 25 3.5 X-ray繞射分析 25 3.6 掃描式電子顯微鏡分析 25 3.7 電化學極化試驗 25 第四章 實驗結果與討論 29 4.1 CuZrTiFeCrx合金鑄材顯微組織及成分分析 29 4.1.1 CuZrTiFeCrx 合金鑄材分析 29 4.1.2 CuZrTiFe合金鑄材 32 4.1.3 CuZrTiFeCr0.1合金鑄材 34 4.1.4 CuZrTiFeCr0.3合金鑄材 36 4.1.5 CuZrTiFeCr0.5 合金鑄材 39 4.1.6 CuZrTiFeCr0.8 合金鑄材 41 4.1.7 CuZrTiFeCr1.0 合金鑄材 43 4.1.8 CuZrTiFeCrx 顯微結構分析與討論 45 4.2 CuZrTiFeCrx 微硬度分析 46 4.3 電化學分析 48 4.3.1 3.5wt%NaCl水溶液環境的影響 48 4.3.2 CuZrTiFeCrx系統於3.5wt%NaCl極化後腐蝕圖 51 4.3.3 CuZrTiFeCrx腐蝕後的顯微結構 53 第五章 結論 59 文獻參考 60

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