Molecular dynamics simulation of single crystal Nickel nanometric machining

Zhu, Zongxiao; Gong, Yadong; Zhou, Yunguang; Gao, Qi

doi:10.1007/s11431-016-6061-y

Cited by 21 publications

(7 citation statements)

References 20 publications

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“…When the tool has a negative rake angle and the and the value changes from −45° to −30°, to −10°, the number of yellow and orange atoms on the machined surface gradually increases. This is because the reduction of the rake angle makes the main processing method change from shearing to extrusion, and the position of the tool diversion point [ 20 ] during processing is improved. More atoms close to the surface are squeezed and left on the processed surface.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

Influence of Tool Shape on Surface Quality of Monocrystalline Nickel Nanofabrication

et al. 2022

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In this paper, the influence of tool shape on the surface quality of monocrystalline nickel nanofabrication is studied. The research mainly adopts the method of molecular dynamics simulation, through the statistics of the atomic coordinates of the machined surface, then calculates the influence of different tool rake angles on the surface roughness of monocrystalline nickel. It is concluded that the surface roughness distribution is ‘W’ when the rake angle of the diamond tool changes from −45° to +45°. When analyzing the relationship between the tool shape and the processing temperature, it is found that when the clearance angle of the tool reaches a certain range, the clearance angle is further increased, and the temperature of the workpiece does not change during machining. Therefore, a large number of simulations were carried out, and it was concluded that there is a critical clearance angle, and the critical clearance angle of the tool in the research conditions is 8–10°.

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Section: Simulation Results and Analysismentioning

confidence: 99%

Influence of Tool Shape on Surface Quality of Monocrystalline Nickel Nanofabrication

et al. 2022

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“…Red represents the HCP atoms, white represents the surface and amorphous atoms, and blue represents the BCC atoms. When plowing, the action range of the tool on the workpiece was limited, and the material was always in the early stage of plastic deformation; thus, a high-density region of dislocations was formed in the machining area [45]. The limited machining depth was not sufficient to form large defects in the high-density region of dislocations to absorb and destroy small dislocations.…”

Section: Internal Defects In Different Machining Statesmentioning

confidence: 99%

Molecular Dynamics Simulation of Chip Morphology in Nanogrinding of Monocrystalline Nickel

Wei

Wang

et al. 2022

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In this study, the nanogrinding process for single-crystal nickel was investigated using a molecular dynamics simulation. A series of simulations were conducted with different tool radii and grinding methods to explore the effects of chip morphology, friction forces, subsurface damage, and defect evolution on the nanogrinding process. The results demonstrate that the workpiece atoms at the back of the tool were affected by the forward stretching and upward elastic recovery when no chips were produced. Although the machining depth was the smallest, the normal force was the largest, and dislocation entanglement was formed. The small number of defect atoms indicates that the extent of subsurface damage was minimal. Moreover, when spherical chips were produced, a typical columnar defect was generated. The displacement vector of the chip atoms aligned with the machining direction and as the chips were removed by extrusion, the crystal structure of the chip atoms disintegrated, resulting in severe subsurface damage. By contrast, when strip chips were produced, the displacement vector of the chip atoms deviated from the substrate, dislocation blocks were formed at the initial stage of machining, and the rebound-to-depth ratio of the machined surface was the smallest.

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“…The Berger vector of the new dislocation 1/6 [110] is on the (001) surface and the slip surface is (001), and since this dislocation cannot slip again on the slip surface, the dislocation is effectively locked and acts as an obstacle to any nearby moving dislocations that share the same slip system [55].…”

Section: Variation Of Internal Defects With Friction Processesmentioning

confidence: 99%

Study on Nanoscale Friction Behavior of TiC/Ni Composites by Molecular Dynamics Simulations

Zheng

Zhu

et al. 2022

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To systematically investigate the friction and wear behavior of TiC/Ni composites under microscopic, the molecular dynamics (MD) method was used to simulate nano-friction on the TiC/Ni composite. Mechanical properties, abrasion depth, wear rates, temperature change of the material during friction, the microscopic deformation behavior, and the evolution of nickel-based titanium carbide microstructure at high-speed friction have been systematically studied. It was found that the variation of tangential and normal forces is related to the relative position of the grinding ball and the TiC phase, when the grinding ball is located above the TiC phase, large fluctuations in the frictional force occur and extreme value of normal force appears, shallow abrasion depth and low wear rate. During the friction process, there is a high-stress area between the grinding ball and the TiC phase, generating a large number of dislocations. The presence of the TiC phase hinders the development and extension of defects, resulting in a significant increase in temperature. At the same time, dislocation entanglement occurs, which improves the wear resistance of the workpiece. In addition, it was also found that the internal atomic motion guided by the carbonized phase was related to the position of the grinding ball relative to the reinforced phase, with the reinforced phase presenting a tendency to rotate in different directions when the grinding ball was in different positions relative to the reinforced phase, which in turn affected the deformation of the whole workpiece.

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Molecular dynamics simulation of single crystal Nickel nanometric machining

Cited by 21 publications

References 20 publications

Influence of Tool Shape on Surface Quality of Monocrystalline Nickel Nanofabrication

Influence of Tool Shape on Surface Quality of Monocrystalline Nickel Nanofabrication

Molecular Dynamics Simulation of Chip Morphology in Nanogrinding of Monocrystalline Nickel

Study on Nanoscale Friction Behavior of TiC/Ni Composites by Molecular Dynamics Simulations

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