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系統識別號 U0026-0208201922090100
論文名稱(中文) 基於計算熱力學輔助強韌Al-Co-Cr-Fe-Ni多主元合金設計
論文名稱(英文) Calphad-assisted design of the Al-Co-Cr-Fe-Ni multiprincipal component alloys with high strength and high ductility
校院名稱 成功大學
系所名稱(中) 材料科學及工程學系
系所名稱(英) Department of Materials Science and Engineering
學年度 107
學期 2
出版年 108
研究生(中文) 朱順翔
研究生(英文) Shun-Xiang Zhu
電子信箱 zhubeiqi2017@gmail.com
學號 N56063016
學位類別 碩士
語文別 中文
論文頁數 106頁
口試委員 指導教授-林士剛
口試委員-許文東
口試委員-蔡銘洪
口試委員-顏秀崗
中文關鍵字 多主元合金  CALPHAD  合金設計  機械性質 
英文關鍵字 Multiprincipal component alloys  CALPHAD  Alloy design  Mechanical properties 
學科別分類
中文摘要 多主元合金,亦稱高熵合金,是一種全新的合金概念,它突破了傳統合金中單一種主要元素的框架及限制,採用多個主要元素來組成合金。因具有多種主元的特點,使得多主元合金的微觀組織和性能在許多方面有別于傳統合金。作為一個材料研究的新興領域,多主元合金有著很高的研究價值與廣汎的應用前景。
本研究以Al-Co-Cr-Fe-Ni多主元合金作為研究對象,使用熱力學計算相圖法 (CALPHAD),通過計算熱力學模擬來預測其相形成,瞭解各元素對成相之影響,並希望藉助計算熱力學模擬的方法來尋找合金成分、相體積分率與機械性質之間的關聯,進而設計出一款兼具強度和韌性的Al-Co-Cr-Fe-Ni多主元合金。
結果顯示,在Al-Co-Cr-Fe-Ni系統中,Co、Ni為FCC相形成元素,Cr為BCC相形成元素,Al為B2相形成元素,Fe為中性元素。CALPHAD可以較為準確地模擬Al-Co-Cr-Fe-Ni多主元合金在凝固過程中發生的反應以及鑄造組織中的相種類,但相體積分率的具體數值與實驗值存在誤差。通過從FCC單相中析出B2相與L12相的方式,目標合金可以兼具良好的強度與韌性,其降伏強度、極限拉伸強度、伸長率分別為470MPa、790MPa、48%,強塑積可達38GPa·%。
英文摘要 Multiprincipal component alloys, also known as high-entropy alloys, are a new concept of alloys that breaks through the limitation of traditional alloy design which is usually based on one or, at most two key elements, and uses multiple principal elements to form alloys. In this study, the Al-Co-Cr-Fe-Ni system was used as the research object. The CALPHAD approach was used to predict the phase formation and understand the impact of each element. It’s hoped that CALPHAD can be used to find the correlation between alloy composition, phase volume fraction and mechanical properties, and design an Al-Co-Cr-Fe-Ni multiprincipal component alloy with high strength and high ductility. The results show that in the Al-Co-Cr-Fe-Ni system, Co and Ni are FCC phase stabilizers, Cr is a BCC phase stabilizer, Al is a B2 phase stabilizer, and Fe is a neutral element. CALPHAD can accurately simulate the reaction of Al-Co-Cr-Fe-Ni multi-principal component alloy during the solidification process and the phase type in the as-cast structure, but the values of volume fraction are inaccurate with the experimental values. By precipitating B2 and L12 from the FCC matrix, the target alloy appears high strength and high ductility, and its YS, UTS and elongation are 470 MPa, 790 MPa, and 48%, respectively.
論文目次 摘要 II
Abstract III
誌謝 X
目錄 XI
表目錄 XIV
圖目錄 XV
第一章 前言 1
第二章 文獻回顧 2
2.1多主元合金 2
2.2多主元合金的相、微結構與其機械性質 5
2.2.1鑄造態多主元合金的相、微結構與其機械性質 5
2.2.2析出強化態多主元合金的相、微結構與其機械性質 8
2.3 CALPHAD 14
2.3.1 CALPHAD的原理與特點 14
2.3.2 CALPHAD於多主元合金設計的應用 18
2.4 Al-Co-Cr-Fe-Ni系統多主元合金 23
2.4.1鑄造態Al-Co-Cr-Fe-Ni系統多主元合金 23
2.4.2析出強化態Al-Co-Cr-Fe-Ni系統多主元合金 28
2.4.3 CALPHAD於Al-Co-Cr-Fe-Ni系統多主元合金的研究 32
第三章 實驗方法與步驟 35
3.1實驗流程 35
3.2熱力學資料庫驗證 37
3.3熱力學計算瞭解各元素對成相之影響 41
3.4建立機械性質與相體積分率的回歸模型 44
3.5高通量計算與結果篩選 45
3.6目標合金製備 47
3.7微結構和晶體結構分析 47
3.8凝固反應及相變溫度之熱分析 48
3.9機械性質量測 49
3.9.1硬度測試 49
3.9.2拉伸試驗 50
第四章 結果與討論 52
4.1熱力學資料庫評估 52
4.2熱力學計算瞭解各元素對成相之影響 61
4.3鑄造態強韌Al-Co-Cr-Fe-Ni多主元合金設計 67
4.3.1鑄造態合金A1相、微結構與凝固反應之分析 73
4.3.2鑄造態合金A2相、微結構與凝固反應之分析 79
4.3.3鑄造態合金A1、A2機械性質之分析 85
4.4析出強化態強韌Al-Co-Cr-Fe-Ni多主元合金設計 90
4.4.1析出強化態合金P1之成分、制程設計 92
4.4.2析出強化態合金P1之相、微結構分析 95
4.4.3析出強化態合金P1之機械性質分析 97
第五章 結論 100
參考文獻 102
附錄 106
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