低密度雙相富鋁高熵合金之微結構觀察與其機械性質研究

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姓名

李兆修(Chao-Hsiu Li) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

低密度雙相富鋁高熵合金之微結構觀察與其機械性質研究
(Microstructure and mechanical properties of low density dual-phase Al-rich high entropy alloys)

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摘要(中)

本研究旨在設計中低密度高熵合金之成分，探討Al Ti Cr Mn V 各個元素對於此合金系統的微結構、熱穩定和機械性質等影響。為設計密度低於5 g/cm3 的低密度合金，以Al為主要成分，配合高熵合金之設計參數規範，加入Ti Cr Mn V 四種元素，以不同比例添加至四元及五元合金。
　　經XRD微結構分析得知AlTiCrMn、AlTiCrMnV系列合金皆可成為BCC加FCC雙相固溶體，根據合金比例不同，其硬度落在250至500 Hv，其中以Al50(TiCrMn)45V5具有最佳的機械性質表現，其硬度值為355Hv，藉由SEM影像分析計算其相比例隨著Ti Cr Mn的變化及由EDS分析雙相中的元素分別含量之結果可詳知Ti為FCC穩定劑，Cr Mn V為BCC穩定劑，此外發現添加V之後，在400至1000度之間有優異的相熱穩定性，更進一步得知最佳的均質化溫度為800°C。在壓縮測試中，Al50(TiCrMn)45V5擁有最大的壓縮強度為1900MPa，降伏強度為900MPa，壓縮延性為32%。

摘要(英)

This study aims to design the high entropy alloy with low density. Investigate the effect of each element of Al Ti Cr Mn V on the microstructure, thermal stability and mechanical properties, etc. To reach the goal of alloy density less than 5 g/cm3, aluminum was designated as the main element and follows with the design specification of high entropy alloys to add titanium, chromium, manganese and vanadium to from the quaternary alloy or quinary alloys.
The XRD results show that AlTiCrMn and AlTiCrMnV series alloys can form dual-phase solid solution (BCC and FCC). The hardness varies from 250 to 500 Hv according to the different alloy compositions. Additionally, we can figure out the effect of Ti Cr Mn additive on BCC and FCC by phase proportion calculation from SEM image analyses as well as the semiquantitative analysis by EDS. Titanium is regarded as FCC stabilizer and the elements of chromium, manganese and vanadium are regarded within BCC stabilizer. Moreover, the addition of vanadium can increase the thermal stability of phase in 400 to 1000°C. The optimum homogenization temperature is 800°C. Al50(TiCrMn)45V5 show the best mechanical properties in compression test, 900MPa of yield strength, 1900Mpa of ultimate strength , and 32% plastic strain.

關鍵字(中)

★ 高熵合金
★ 低密度
★ 雙相
★ 富鋁
★ 固溶

關鍵字(英)

★ high entropy alloys
★ low density
★ dual-phase
★ Al-rich
★ solid solution

論文目次

中文摘要 I
Abstract II
致謝 III
總目錄 IV
表目錄 VII
圖目錄 VIII
一、緒論 1
1-1 前言 1
1-2 研究目的 1
二、文獻回顧 3
2-1 高熵合金發展及定義 3
2-2 高熵合金形成參數 4
2-3 高熵合金四大效應 5
2-3-1 高熵效應 5
2-3-2 晶格應變效應 6
2-3-3 遲緩擴散效應 7
2-3-4 雞尾酒效應 7
2-4 新型高熵合金發展及設計 8
2-4-1 非等比例高熵合金 8
2-4-2 低密度高熵合金 9
2-4-3 非等比例低密度高熵合金 9
2-5 合金設計計算 10
2-5-1 固溶體之參數計算 10
2-5-2 合金之密度預測及真實密度 11
三、實驗方法 20
3-1 元素選擇及設計方法 20
3-2 合金製備 20
3-3 均質化熱處理 21
3-4 合金之微結構分析 21
3-4-1 X光繞射儀(XRD) 21
3-4-2 光學顯微鏡(Optical Microscopy) 22
3-4-3 掃描式電子顯微鏡(SEM) 22
3-4-4 能量散射光譜儀(EDS) 22
3-5 熱性質分析 23
3-5-1 試片製作 23
3-5-2 熱示差掃描熱分析儀(DSC) 23
3-6 機械性質分析 23
3-6-1 維氏硬度測試 23
3-6-2 壓縮測試 24
3-7 穿透式電子顯微鏡(TEM) 25
四、結果討論 34
4-1 密度計算 34
4-2 第一階段 - Al(80-X)Ti20(CrMn)X, (X=20,30,40) 34
4-2-1 合金成分設計 34
4-2-2 微結構分析 35
4-2-3 機械性質 36
4-3 第二階段 - Al50系列 36
4-3-1 合金成分設計 36
4-3-2 微結構分析 37
4-3-3 Ti Cr Mn 對雙相結構之影響 38
4-3-4 機械性質 40
4-4 熱處理對Al50系列之影響 41
4-4-1 微結構 41
4-4-2 機械性質 42
4-5 第三階段 - Al50(TiVCr)(50-X)VX, (X=5, 12.5, 20) 42
4-5-1 合金成分設計 42
4-5-2 微結構 43
4-5-3 熱處理之微結構 44
4-5-4 機械性質 45
4-5-5 AlTiCMnV系列合金之均質化 45
4-6 DSC熱性質分析 46
4-7 破裂面之分析 46
4-8 穿透式電子顯微鏡分析 47
五、結論 83
參考文獻 84

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2019-8-20

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