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研究生:張辰安
研究生(外文):Chan-An Chung
論文名稱:機械合金製程對耐火高熵合金特性之影響
論文名稱(外文):Effect of mechanical alloying on characteristics of refractory high entropy alloys
指導教授:陳俊良陳俊良引用關係
指導教授(外文):Chun-Liang Chen
口試委員:白益豪王誠佑陳俊良
口試委員(外文):Yi-Hao PaiCheng-Yu WangChun-Liang Chen
口試日期:2020-07-21
學位類別:碩士
校院名稱:國立東華大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2020
畢業學年度:108
語文別:中文
論文頁數:83
中文關鍵詞:機械合金高熵合金耐火高熵合金
外文關鍵詞:Mechanical alloyhigh entropy alloysrefractory high entropy alloys
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耐火高熵合金具有良好機械性質及高溫穩定性。本實驗利用機械合金製程製備多種耐火金屬高熵合金。本研究分為五大部分進行探討,首先針對不同燒結方法對WMoVTi中熵合金之影響。結果顯示高真空燒結可有效降低氧化物粒子形成及顯微結構均一性。第二部分則探討釔元素對於WMoVNb中熵合金研究。添加釔元素能增強合金固溶性,強化材料機械性質。第三部分則進一步探討鈦含量對WMoVCrTi高熵合金之影響。其結果顯示氧化鈦顆粒會隨鈦含量增加而增加,進而影響材料性能。第四部分則探討燒結溫度對WMoVCrTi高熵合金之影響,提高燒結溫度,除了能夠強化高熵合金的固溶性,也可使形成單一BCC固溶相。最後一部分研究於鎢的添加對WMoVCrTi高熵合金之影響。鎢含量的改變,會影響球磨階段合金化與固溶性及最終材料的機械性質。
關鍵字:機械合金、高熵合金、耐火高熵合金
Refractory high entropy alloys (RHEAs) have excellent mechanical properties and high temperature stability. In this study, the different model refectory high entropy alloys produced by mechanical alloying were investigated. There are five main investigations included in this study. Firstly, the effect of sintering methods on WMoVTi medium entropy alloys has been studied. The results indicate that high vacuum sintering can effectively reduce the formation of oxide particles and microstructure homogeneity. Secondly, the WMoVNb medium high entropy alloys adding with a small amount of Y was studied. The addition of Y element can enhance solubility of alloy system and mechanical properties. The third part was further to understand the effect of Ti content on WMoVCrTi high entropy alloys. The results show that Ti-rich oxides increase with increasing Ti concentration, which can alter the material performance. The next part was to investigate the influence of sintering temperatures on WMoVCrTi high entropy alloys. It reveals that a higher sintering temperature can promote solubility of the model high entropy alloys and form a single BCC solid solution phase. The final part was to clarify the effect of W element on WMoVCrTi high entropy alloys. The change of W content can affect alloying processing during ball milling, solubility of alloy system and mechanical properties of final products.
Keyword: Mechanical alloy; high-entropy alloys; refractory high entropy alloys
第1章 緒論 1
1.1前言 1
1.2研究動機 2
第2章 文獻回顧 3
2.1高熵合金 3
2.1.1高熵合金發展及原理 3
2.1.2 嚴重的晶格應變 4
2.1.3 擴散速率降低 4
2.1.4雞尾酒效應 5
2.2耐火高熵合金 5
2.3散佈強化 7
2.4 機械合金 8
2.4.1 機械合金原理 8
2.4.2 機械合金製程 8
第3章 研究方法與實驗步驟 15
3-1 粉末製備 15
3-2 合金成形 15
3-3 合金分析 16
第4章 結果與討論 27
4.1不同燒結方法對WMoVTi中熵合金之影響 27
4.1.1粉體XRD分析 27
4.1.2 塊材SEM與EDS分析 28
4.1.3 塊材XRD分析 29
4.1.4維氏硬度分析 29
4.2釔對於WMoVNb 中熵合金的影響 36
4.2.1粉體XRD分析 36
4.2.2 SEM與EDS分析 37
4.2.3 塊材XRD分析 38
4.2.4維氏硬度分析 39
4.3鈦含量對WMoVCrTi高熵合金影響 47
4.3.1粉體XRD分析 47
4.3.2 SEM與EDS分析 47
4.3.3 塊材XRD分析 48
4.3.4維氏硬度分析 49
4.3.5壓縮應力分析 49
4.4燒結溫度對WMoVCrTi高熵合金影響 60
4.4.1 SEM與EDS分析 60
4.4.2 XRD分析 61
4.4.3維氏硬度分析 62
4.5鎢的添加對WMoVCrTi高熵合金影響 69
4.5.1 粉體XRD分析 69
4.5.2 塊材SEM與EDS分析 69
4.5.3 塊材XRD分析 70
4.5.4維氏硬度分析 71
第5章 結論 79
參考文獻 82
Uncategorized References
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