Chapter 5 Effect of processing routes on the microstructure/phases of high-entropy alloys
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Anil Kumar
Abstract
In the current work, an effort has been made to assess the impact of the processing method on the phase evolution and the mechanical characteristics of CoCrCuFe- NiSix high-entropy alloys (x = 0, 0.3, 0.6, and 0.9 atomic ratios). The CoCrCuFeNiSix highentropy alloys were made by spark plasma sintering and vacuum arc melting. After spark plasma sintering, the X-ray diffraction data show a face-centered cubic structure and a sigma phase. It is also noted that the inclusion of Si promotes the production of the sigma phase. As opposed to this, a sample that is papered using the arc meting method displayed a face-centered cubic structure up to 0.6 Si content. Ni3Si is created when Si is increased further (by 0.6 and 0.9). The increase in Si concentration from 0 to 0.9 in both synthesis processes led to increased microhardness and enhanced the wear resistance. However, due to the production of sigma phases, the spark plasma sintered samples outperformed the arc-melted samples in terms of physical attributes.
Abstract
In the current work, an effort has been made to assess the impact of the processing method on the phase evolution and the mechanical characteristics of CoCrCuFe- NiSix high-entropy alloys (x = 0, 0.3, 0.6, and 0.9 atomic ratios). The CoCrCuFeNiSix highentropy alloys were made by spark plasma sintering and vacuum arc melting. After spark plasma sintering, the X-ray diffraction data show a face-centered cubic structure and a sigma phase. It is also noted that the inclusion of Si promotes the production of the sigma phase. As opposed to this, a sample that is papered using the arc meting method displayed a face-centered cubic structure up to 0.6 Si content. Ni3Si is created when Si is increased further (by 0.6 and 0.9). The increase in Si concentration from 0 to 0.9 in both synthesis processes led to increased microhardness and enhanced the wear resistance. However, due to the production of sigma phases, the spark plasma sintered samples outperformed the arc-melted samples in terms of physical attributes.
Chapters in this book
- Frontmatter I
- Contents V
- About the editors VII
- List of contributing authors IX
- Chapter 1 Overview of high-entropy alloys 1
- Chapter 2 Classification of processing routes 31
- Chapter 3 Powder metallurgy route 41
- Chapter 4 Melting and casting route 57
- Chapter 5 Effect of processing routes on the microstructure/phases of high-entropy alloys 67
- Chapter 6 Correlation of the sintering parameters with the mechanical properties of HEAs processed through the powder metallurgy route 75
- Chapter 7 Basic alloying elements used in high-entropy alloys 83
- Chapter 8 Effect of alloying elements on the phases of high-entropy alloys 89
- Chapter 9 Effect of alloying elements on the properties of high-entropy alloys 99
- Chapter 10 Emerging processing routes 109
- Index 119
Chapters in this book
- Frontmatter I
- Contents V
- About the editors VII
- List of contributing authors IX
- Chapter 1 Overview of high-entropy alloys 1
- Chapter 2 Classification of processing routes 31
- Chapter 3 Powder metallurgy route 41
- Chapter 4 Melting and casting route 57
- Chapter 5 Effect of processing routes on the microstructure/phases of high-entropy alloys 67
- Chapter 6 Correlation of the sintering parameters with the mechanical properties of HEAs processed through the powder metallurgy route 75
- Chapter 7 Basic alloying elements used in high-entropy alloys 83
- Chapter 8 Effect of alloying elements on the phases of high-entropy alloys 89
- Chapter 9 Effect of alloying elements on the properties of high-entropy alloys 99
- Chapter 10 Emerging processing routes 109
- Index 119
