Abstract
Context
Molecular dynamics (MD) was carried out to simulate the friction behavior of Ni-Cr alloy coating containing pores. The mechanical properties, displacement, abrasion depth, and defect change patterns of the coating under nano-friction were studied. It was found that the stacking fault would extend to the pores, and both tangential and normal forces decreased when the grinding ball was above the pores. Meanwhile, the pores changed the extension direction of shear strain inside the coating, and stress concentrations were generated at the pores. In addition, the deformation behavior inside the coating was influenced by the processing depth, the smaller the relative height of the grinding ball and the pore, the greater the atomic deformation around the pore. The pores changed the path of atomic movement, resulting in less deformation of the coating below the pores. The presence of pores promoted the generation of surface steps and increased the amount of wear on the coating. It was also found that pores facilitated energy release and provided space for dislocation extension, and the large accumulation of dislocations led to frictional strengthening near the pores, which enhanced the properties of the material below the pores. It was found that the increase of the pore size caused the normal force decrease and the wear performance of the coating decrease, but the thermal insulation performance would be improved.
Methods
In this paper, nanoscale modeling was performed in the large-scale atomic/molecular parallel simulator (LAMMPS) simulation environment. The model was visualized and analyzed in three dimensions by Open Visualization Tool (OVITO), the common neighbor analysis (CNA) method was used to obtain the atomic structure information, and the dislocation analysis (DXA) method was applied to obtain the dislocations.
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Data will be made available on request.
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Funding
The work was supported by the National Natural Science Foundation of China (Grant No.52265025), the National Natural Science Foundation of China (Grant No.51975558), and the Open Project of State Key Laboratory of Solid Lubrication (LSL-2215).
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Writing-Original Draft and Formal analysis, (Weihua Chen); Data Curation, Visualization and Editing, (Yanjie Liu); Investigation and Conceptualization (Dingfeng Qu); Validation and Supervision (Min Zheng); Investigation and Formal analysis (Qifa Lang); Methodology, Resources and Supervision, (Shengyu Zhu); Methodology, Resources and Validation, (Zongxiao Zhu).
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Chen, W., Liu, Y., Qu, D. et al. Effect of pores on microscopic wear properties and deformation behavior of Ni-Cr alloy coating. J Mol Model 29, 330 (2023). https://doi.org/10.1007/s00894-023-05734-x
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DOI: https://doi.org/10.1007/s00894-023-05734-x