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研究生： GURUMAYUM ROBERT KENEDY
GURUMAYUM ROBERT KENEDY
論文名稱： The study of phase transformations in Cr40Co20Fe20Ni20 and Cr39Co18Fe18Ni18Al7 high-entropy alloys
The study of phase transformations in Cr40Co20Fe20Ni20 and Cr39Co18Fe18Ni18Al7 high-entropy alloys
指導教授： 鄭偉鈞
Wei-Chun Cheng
口試委員: 王朝正
Chaur-Jeng Wang
陳士勛
Shih-Hsun Chen
任盛源
Shien-Uang Jen
陳貞光
J.K.Chen
莊水旺
Shuei-Wan Juang
鄭偉鈞
Wei-Chun Cheng
學位類別： 博士
Doctor
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2022
畢業學年度： 110
語文別： 英文
論文頁數： 150
中文關鍵詞： 高熵合金 、旋節分解 、有序化反應
外文關鍵詞： High-entropy alloy, Spinodal decomposition, Ordering reaction
相關次數： 點閱：200  下載：1 
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  •  上一筆

    • 本篇論文研究了兩種高熵合金，成分個別為Cr40Co20Fe20Ni20和Cr39Co18Fe18Ni18Al7，觀察這兩種合金的顯微組織、組成相及其相變化。合金均會在 1300°C 至 500°C 的各種溫度下進行熱處理，然後進行水淬或空冷。四元合金 Cr40Co20Fe20Ni20 在 1300°C 和 1200°C 持溫一段時間後水淬至室溫會由 BCC 和 FCC 相組成，而在相同溫度持溫後空冷至室溫的試片會由 BCC、FCC和相組成。在 1100 °C持溫一段時間後水淬和空冷至室溫的試片，均會出現相，並持續到 500 °C。
    合金Cr39Co18Fe18Ni18Al7在1300 to 1100℃之間由BCC1、BCC2和FCC三相組成。 在 1000 °C 時，相為出現在合金中的第四相。在冷卻過程中，已發現 BCC 基地中會依次發生旋節分解和有序化反應。高溫 BCC 相通過旋節分解分解為兩個低溫 BCC 相（標記為 BCC1 和 BCC2）。 BCC2 相隨後通過有序化反應轉變為 B2 相。
    此外，在肥粒體基地中B2顆粒之間出現奈米級B2顆粒，這也是冷卻過程中在低溫發生旋節分解和有序化反應的結果。

    The constituent phases and their corresponding phase transformations of a study the microstructure and phase transformation of two HEA compositions Cr40Co20Fe20Ni20 and as the base alloy for preliminary study, another with the addition of Al to the base alloy with the nominal composition of Cr39Co18Fe18Ni18Al7. The alloy specimens were heat-treated at various temperatures ranging from 1300 °C to 500 °C, followed by either water quenching or air cooling. The quaternary alloy, Cr40Co20Fe20Ni20 water quenched samples at 1300 °C and 1200 °C consists of BCC and FCC phase whereas air-cooled sample for the same temperature consists of BCC, FCC and phase. At 1100 °C both the water and air-cooled samples start exhibiting phase and it persist till 500 °C.
    The alloy Cr39Co18Fe18Ni18Al7 is composed of triple phases of BCC1, BCC2 and FCC between 1300 °C and 1100 °C. Upon cooling the HEA, the spinodal decomposition and ordering reaction, sequentially, in the BCC matrix has been discovered. The high-temperature BCC phase decomposes into two low-temperature BCC phases (marked as BCC1 and BCC2) through spinodal decomposition. The BCC2 phase undergoes the ordering reaction later and transforms to the B2 phase. phase appears as the fourth phase in the HEA at 1000 °C.

    Additionally, the appearance of nanoscale B2 particles between the B2 particles in the ferrite matrix is also the result of spinodal decomposition and ordering reaction during cooling at lower temperatures.

    Table of contents CHAPTER 1 1 INTRODUCTION 1 1.1 Brief History 1 1.3 Thesis structure 3 CHAPTER 2 5 2.1 HIGH ENTROPY ALLOYS & LITERATURE REVIEW 5 2.1.1 Brief Introduction 5 2.1.2 Definition of high entropy alloys 6 2.1.3 HEA Core Effects 6 2.1.4 Literature review 9 2.2 PHASE TRANSFORMATIONS THEORY 14 2.2.1 Spinodal Decomposition 14 2.2.2 Spinodal Decomposition and Free Energy Diagram 15 2.2.3 Ordering reaction 16 2.2.4 Precipitation Transformation 18 CHAPTER 3 24 EXPERIMENTAL METHODS 24 3.1 Introduction 24 3.2 Alloy Casting 24 3.3 Ingot Processing 25 3.4 Heat Treatment 26 3.5 XRD and Microhardness Sample Preparation 26 3.6 Metallography Sample Preparation 27 3.7 Metallography Sample Requisites 28 3.8 Steps involved in metallography sample preparation 28 3.9 TEM Sample Preparation 30 3.10 Precision Ion Polishing System (PIPS) 30 3.11 Focused ion beam 31 3.12 Characterization Techniques and Tools 31 3.13 Mechanical Testing – Hardness Test 31 3.14 Light Optical Microscopy 33 3.15 Scanning Electron Microscopy (SEM) 33 3.16 Transmission Electron Microscopy 36 3.17 Principle of Contrast Generation in an Electron Microscope 37 3.18 TEM Imaging 37 3.19 Diffraction Pattern (DP) 38 3.22 Scanning Transmission Electron Microscope (STEM) 42 CHAPTER 4 58 RESULTS AND DISCUSSION 58 4.1 Quarternary HEAs………………………………………………………………..57 4.1.1 Solution treatment at 1300 °C for 30 mins and water quenched (A-1300WQ) 58 4.1.2 Solution treatment at 1300 °C for 30 mins and air cooling (A-1300AC) 59 4.1.3 Solution Treatment at 1200 °C for 30 mins and water quenched (A-1200WQ) 60 4.1.4 Solution Treatment at 1300 °C for 30 mins and water quenched (A1300-AC) 60 4.1.5 Solution Treatment at 1100°C for 1 hour and then either water quenched or air cooling (A-1100WQ And A-1100AC) 61 4.1.6 Solution Treatment at 1050 °C for 1 hour and aging at various temperatures below 1050 °C for 100 hours and water quenched 61 4.2 Quinary HEAs………………………………………………………………….....62 4.2.1 Solution treatment at 1300 °C for 30 mins and water quenched (B-1300WQ) 62 4.2.2 Spinodal Decomposition Observation 63 4.2.3 STEM Study 66 4.2.4 Solution treatment at 1300 °C for 30 mins and air cooling (B-1300AC) 67 4.2.5 Solution treatment at 1200 °C for 30 mins and water quenched (B-1200WQ) 68 4.2.6 Solution treatment at 1200 °C for 30 mins and water quenched (B-1200AC) 69 4.2.7 Solution treatment at 1100 °C for 30 mins and water quenched (B1100-WQ) 70 4.2.8 Solution treatment at 1100 °C for 30 mins and water quenched (B1300-AC) 71 4.2.9 Solution treatment at 1050 °C for 1hour and water quenched followed by aging at various temperatures 72 4.2.10 Hardness study 72 CHAPTER 5 121 CONCLUSIONS 121 5.1 Quaternary HEA 121 5.2 Quinary HEA 121

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