Uncovering Nanoindention Behavior of Amorphous/Crystalline High-Entropy-Alloy Composites
Abstract
:1. Introduction
2. Simulation Method and Model
3. Result and Discussion
3.1. The Nanoindention Process
3.2. Effect of Amorphous Layer Thickness
3.3. Strengthening Model
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | Amorphous/Crystalline HEA Composite | Virtual Indenter |
---|---|---|
Dimensions | 464 Å × 455 Å × 460 Å | Radius 100 Å |
Number of atoms | 5,595,219 | |
Time step | 1 fs | |
Initial temperature | 300 K | |
Indentation velocity | 10 m/s | |
Depth of indentation | 40 Å | |
Thickness of amorphous layer 2 nm, 5 nm, 8 nm, and 12 nm |
Parameter | Fe | Co | Cr | Ni |
---|---|---|---|---|
Atomic radius (pm) | 124 | 126 | 125 | 125 |
Young’s modulus (GPa) | 211 | 209 | 279 | 200 |
Shear modulus (GPa) | 82 | 75 | 115 | 76 |
Atomic fraction (at%) | 25% | 25% | 25% | 25% |
Parameter | Symbol | Magnitude |
---|---|---|
Taylor constant | M | 3 |
Shear modulus (GPa) | 87 | |
Poisson’s ratio | 0.3 | |
Burger vector of partial dislocation (nm) | bp | 0.1476 |
Burger vector of full dislocation (nm) | b | 0.256 |
Thickness of amorphous (nm) | 2, 5, 8, 12 | |
Thickness of crystalline phase (nm) | d | 44, 41, 38, 34 |
Average density of dislocation (m−2) | 5 × 1015~1 × 1015 | |
Empirical constant | 0.33 | |
Empirical constant | 1.15 |
Amorphous Layers Thickness (nm) | (MPa) | (MPa) | (MPa) | (MPa) |
---|---|---|---|---|
2 | 270 | 962 | 1485 | 113.5 |
5 | 252 | 949 | 1206 | 276 |
8 | 233 | 936 | 851 | 439 |
12 | 209 | 917 | 513 | 657 |
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Chen, Y.; Ren, S.; Liu, X.; Peng, J.; Liaw, P.K. Uncovering Nanoindention Behavior of Amorphous/Crystalline High-Entropy-Alloy Composites. Materials 2024, 17, 3689. https://doi.org/10.3390/ma17153689
Chen Y, Ren S, Liu X, Peng J, Liaw PK. Uncovering Nanoindention Behavior of Amorphous/Crystalline High-Entropy-Alloy Composites. Materials. 2024; 17(15):3689. https://doi.org/10.3390/ma17153689
Chicago/Turabian StyleChen, Yuan, Siwei Ren, Xiubo Liu, Jing Peng, and Peter K. Liaw. 2024. "Uncovering Nanoindention Behavior of Amorphous/Crystalline High-Entropy-Alloy Composites" Materials 17, no. 15: 3689. https://doi.org/10.3390/ma17153689