Related Experiment Video
Updated: Oct 2, 2025
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.6K
Microstructural Evolution and Mechanical Properties of Non-Equiatomic (CoNi)74.66Cr17Fe8C0.34 High-Entropy Alloy
You Sub Kim1, Hobyung Chae1, E-Wen Huang2
1Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Korea.
Materials (Basel, Switzerland)
|February 25, 2022
Summary
This study developed a non-equiatomic high-entropy alloy (HEA) with enhanced strength and ductility. The alloy
Area of Science:
- Materials Science
- Metallurgy
- Solid State Physics
Background:
- High-entropy alloys (HEAs) offer tunable properties.
- Non-equiatomic HEAs present opportunities for property optimization.
- Understanding microstructural evolution is key to HEA design.
Purpose of the Study:
- To investigate the tensile properties and microstructural evolution of a non-equiatomic (CoNi)74.66Cr17Fe8C0.34 HEA.
- To compare its mechanical behavior with equiatomic HEAs.
- To elucidate the role of stoichiometry on stacking fault energy and deformation mechanisms.
Main Methods:
- In situ neutron diffraction.
- Electron backscattered diffraction (EBSD).
- Transmission electron microscopy (TEM).
- Tensile testing.
Main Results:
- The non-equiatomic HEA exhibited superior strength and ductility compared to its equiatomic counterpart.
- A higher stacking fault energy (SFE ~50 mJ/m2) was observed, promoting dislocation motion over twinning.
- Unique strain hardening behavior was linked to stress triaxiality in specific grain families.
Conclusions:
- Non-equiatomic HEA design can achieve a desirable balance of strength and ductility.
- Stoichiometric control influences solid solution stability and stacking fault energy.
- The findings offer insights for designing advanced HEAs with tailored mechanical properties.
More Related Videos
Related Concept Videos
01:18Mechanical Characteristics of Steel
791
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
791
02:37Metallic Solids
19.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
19.4K
01:26Hooke's Law
623
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
623
01:25Yield Criteria for Ductile Materials under Plane Stress
223
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
223
01:08Bending of Members Made of Several Materials
308
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
308
01:24Stress-Strain Diagram - Ductile Materials
1.0K
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
1.0K