快速升溫速率退火對Ti65(AlNbCrV)28Zr7中熵合金微結構及其機械性質影響之研究

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黃俊嘉(Chun-Chia Huang) 查詢紙本館藏

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機械工程學系

論文名稱

快速升溫速率退火對Ti65(AlNbCrV)28Zr7中熵合金微結構及其機械性質影響之研究
(Effect of rapid heating annealing on the microstructure and mechanical properties of Ti65(AlNbCrV)28Zr7 medium-entropy alloys)

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至系統瀏覽論文 (2027-8-31以後開放)

摘要(中)

先前實驗室設計出密度接近5 g/cm3、降伏強度能達到1200 MPa以及塑性能維持15 %以上之Ti65(AlCrNbV)28Zr7中熵合金，本研究目的為利用不同滾軋製程與升溫速率將機械性質再一次提升。首先將選定之元素，用高溫電弧融煉技術鑄成具有簡單固溶相之六元Ti65(AlCrNbV)28Zr7中熵合金，並透過滾軋製程使其厚度降低累積應變能，再將其以短時間不同升溫速率之退火熱處理使材料晶粒細化，藉由分析微結構與機械性質探討其強化機制，找出最合適的加工製程與熱處理參數。
研究結果顯示，鑄造態的Ti65(AlCrNbV)28Zr7為單一BCC相，並能達到1000 MPa以上的降伏強度與20.0 %以上的拉伸塑性。將此系列合金以熱機處理強化，發現給予冷滾軋試片較大的加工量，在熱處理後能得到較佳的機械性質組合，另外若使用較快加溫速率的熱機處理，可以更進一步得到優秀的機械性質組合。此外在冷滾軋前合金材料可藉由熱滾軋製程提高整體之延展性。本實驗中，將材料以90%冷軋，以25°C/s退火熱處理能達到期望之機械性質，能達到預期的1220MPa與17.0%延性。

摘要(英)

The developed light weight medium entropy alloy, Ti65(AlCrNbV)28Zr7 (Ti-65MEA), owns the ideal characteristic such as density is close to 5 g/cm3, yield strength of 1200 MPa and plastic strain maintained above 15%. The purpose of this study is to improve mechanical properties by various hot/cold rolling process couple with annealing heating rate. The as-cast samples are successfully cast into alloy ingots by vacuum metallurgy and rapidly solidification technology. The as-cast samples show the single BCC phases and the mechanical properties are 1015 MPa and 23% for yield strength and tensile ductility, respectively. The ingots then strengthened through the rolling process which can accumulate the strain energy by reducing the thickness of ingot. Secondly, through 15 and 25 ℃/sec annealing heating rate in a several certain time period to verify the change of the grain size.
According to the tensile test results, as-cast Ti65(AlCrNbV)28Zr7 remain single BCC phases. Also, it can achieve yield strength above 1000 MPa and tensile ductility above 20.0%. In addition, the alloys were applied a larger amount of processing to the cold-rolled test pieces can possess mechanical properties after heat treatment, moreover, faster heating rate can also have better mechanical properties. Reducing the thickness of material by 90% by cold rolling and annealing in 25°C/s can achieve the goal. Due to the reducing of the recrystallization temperature, the closest processing parameters obtained in this experiment did not reach the goal by reducing the thickness by 50 % first by hot rolling, and then reduce the thickness by 80 % by cold rolling. So the best parameters of this material is reducing by 90% by cold rolling. After processing annealing, Ti65(AlCrNbV)28Zr7 can achieve the desired mechanical properties, which is tensile yield strength of 1220 MPa and plastic strain of 17.3 %.

關鍵字(中)

★ 輕量化中熵合金
★ 非等原子比
★ 熱機處理

關鍵字(英)

★ light-weight MEAs
★ non-equiatomic
★ thermomechanical treatment

論文目次

摘要 I
Abstract II
致謝 IV
總目錄 V
表目錄 VIII
圖目錄 IX
第一章緒論 1
1-1 前言 1
1-2研究目的 1
第二章文獻回顧 3
2-1高熵合金之發展與定義 3
2-2高熵合金之固溶體形成條件 3
2-3高熵合金四大效應 5
2-3-1高熵效應 5
2-3-2嚴重晶格扭曲 6
2-3-3 雞尾酒效應 6
2-3-4延遲擴散效應 7
2-4高熵合金成分設計 7
2-4-1低密度高熵合金 7
2-4-2 非等比例高熵合金 8
2-5機械行為之影響因素 8
2-5-1固溶強化 9
2-5-2熱機處理 9
2-5-3 異構組織強化 10
第三章實驗步驟及方法 19
3-1 元素選擇與設計 19
3-2中熵合金的製備 19
3-2-1 合金成分的配製 19
3-2-2 合金熔煉 19
3-2-3中熵合金板材製作 20
3-2-4 均質化熱處理 20
3-2-5 熱滾軋 21
3-2-6 冷滾軋 21
3-3 再結晶退火熱處理 21
3-4 合金密度量測 22
3-5 微結構分析 22
3-5-1 X 光繞射分析儀(XRD) 22
3-5-2 光學顯微鏡(Optical Microscopy) 23
3-5-3 能量散射光譜儀(EDS) 23
3-5-4 電子背散射繞射分析儀(EBSD) 23
3-6熱示差掃描熱量分析(DSC) 23
3-7機械性質分析 24
3-7-1 維式硬度測試 24
3-7-2拉伸強度測試 24
第四章實驗結果與分析 40
4-1合金成分選定 40
4-1-1合金選擇與固溶體之相關參數計算 40
4-1-2 成分分析 40
4-1-3 合金密度 40
4-2均質化熱處理 41
4-3 滾軋及再結晶退火熱處理 41
4-3-1 X-ray繞射分析 41
4-4滾軋及再結晶退火後的微觀組織分析 42
4-4-1 CR80微觀組織 42
4-4-2 CR90微觀組織 43
4-4-3 HRCR70微觀組織 43
4-4-4 HRCR80微觀組織 44
4-5 滾軋及再結晶退火後拉伸測試 45
4-5-1 CR80拉伸測試 45
4-5-2 CR90拉伸測試 46
4-5-3 HRCR70拉伸測試 47
4-5-4 HRCR80拉伸測試 47
4-6異質結構強化分析 48
4-7熱機處理之結構與機制分析 49
第五章結論 88
第六章參考資料 89

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2022-8-3

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