| Cite this article as: Zhu He-Jun. Molecular dynamics study on fatigue properties and defect evolution of FeCrNiCoCu alloy [J]. J. At. Mol. Phys.(原子与分子物理学报), 2025, 42: 042004 (in Chinese) |
| Molecular dynamics study on fatigue properties and defect evolution of FeCrNiCoCu alloy |
| Hits 254 Download times 45 Received:December 04, 2023 Revised:December 12, 2023 |
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| DOI
10.19855/j.1000-0364.2025.042004 |
| Key Words
cyclic loading, molecular simulation, fatigue deformation microscopic defect evolution |
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| Abstract
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| Fatigue failure is one of the important failure forms of mechanical components. In this paper, the fatigue mechanical properties and microstructure evolution of high entropy alloy FeCrNiCoCu alloy were investigated by molecular dynamics simulation under the stress variable ε=0.08. It was found that the FeCrNiCoCu model exhibited obvious cyclic softening and cyclic hardening during cyclic loading, and cyclic softening and cyclic hardening occurred alternately. Through the analysis of the model structure, it is found that there are residual dislocations and layer dislocations at the end of each cycle, and these defects directly affect the fatigue stress of the next cycle. The statistical analysis of the total energy and the percentage of disordered atoms in the model shows that the total energy of the model tends to increase. The percentage of disordered atoms in the model gradually increases and finally stabilizes at about 0.09. Disordered atoms have a direct impact on the generation and annihilation of dislocations, and then on cyclic hardening and cyclic softening. |
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