| Cite this article as: Shi Yin-Hua,Shi Qin. Molecular dynamics simulation of nanoindentation of CoCrNiFeCu high entropy alloy with void [J]. J. At. Mol. Phys.(原子与分子物理学报), 2025, 42: 036003 (in Chinese) |
| Molecular dynamics simulation of nanoindentation of CoCrNiFeCu high entropy alloy with void |
| Hits 396 Download times 67 Received:June 24, 2023 Revised:July 08, 2023 |
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| DOI
10.19855/j.1000-0364.2025.036003 |
| Key Words
CoCrNiFeCu molecular dynamics nanoindentation mechanical properties dislocation evolution |
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| Abstract
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| High entropy alloys have excellent mechanical properties, wear resistance, corrosion resistance and high temperature resistance, and become one of the most promising new materials in the future. Therefore, the influence of pores on the mechanical properties and dislocation evolution of nano-indentation in the CoCrNiFeCu high-entropy alloy model was investigated by molecular dynamics simulation. The results show that the mechanical parameters, such as yield point, load, Young's modulus and hardness, increase first and then stabilize with the increase of hole depth D. The presence of holes significantly affects the location of dislocation nucleation. With the increase of hole depth, the initial dislocations preferentially form between the hole and the surface, and then concentrate on the surface of the model, and the dislocation ring changes from a planar ring to a "winglike" one. When the hole depth is small (D < 40 Å), the dislocation ring expands horizontally along the (110) plane, and begins to expand downward as the hole depth increases. In addition, the dislocation density gradually increases with the hole depth at the indentation depth of 30 Å. |
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