Chapter 6 Correlation of the sintering parameters with the mechanical properties of HEAs processed through the powder metallurgy route
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K. Raja Rao
Abstract
In order to produce high-entropy alloys (HEAs), researchers have experimented with several processing strategies. HEAs may be produced in a variety of configurations, such as dense solid castings, powder metallurgy components, and films. The techniques for the synthesis of HEA may be grouped into three categories: melting and casting, powder metallurgy, and deposition techniques. These are the broad categories that can be used to describe the processing methods. Synthesis of HEAs by solid-state processing comprises mechanical alloying (MA) of the elemental blends, followed by consolidation. The MA process is a high-energy ball milling of the elemental powder mixes that involves the diffusion of species into each other in order to generate a homogenous alloy. The MA process is also referred to as the ball milling method. One of the benefits of MA is that it may provide great uniformity in the composition of the alloy, which is one of its advantages. In order to produce dense components, the HEAs that have been produced using the powder metallurgy process must be sintered. Conventional sintering of nanocrystalline alloy powders can result in considerable grain growth if the alloy powders are subjected to high temperatures for an extended length of time. In order to counteract this issue, the nanocrystalline alloys that are produced by MA are often sintered in spark plasma before being consolidated (SPS).
Abstract
In order to produce high-entropy alloys (HEAs), researchers have experimented with several processing strategies. HEAs may be produced in a variety of configurations, such as dense solid castings, powder metallurgy components, and films. The techniques for the synthesis of HEA may be grouped into three categories: melting and casting, powder metallurgy, and deposition techniques. These are the broad categories that can be used to describe the processing methods. Synthesis of HEAs by solid-state processing comprises mechanical alloying (MA) of the elemental blends, followed by consolidation. The MA process is a high-energy ball milling of the elemental powder mixes that involves the diffusion of species into each other in order to generate a homogenous alloy. The MA process is also referred to as the ball milling method. One of the benefits of MA is that it may provide great uniformity in the composition of the alloy, which is one of its advantages. In order to produce dense components, the HEAs that have been produced using the powder metallurgy process must be sintered. Conventional sintering of nanocrystalline alloy powders can result in considerable grain growth if the alloy powders are subjected to high temperatures for an extended length of time. In order to counteract this issue, the nanocrystalline alloys that are produced by MA are often sintered in spark plasma before being consolidated (SPS).
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
