Molecular dynamics simulation of silicon carbide nanoscale material removal behavior

Liu, Yao; Li, Beizhi; Kong, Lingfei

doi:10.1016/j.ceramint.2018.03.195

Cited by 46 publications

(19 citation statements)

References 11 publications

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“…Higher scratching speed and larger depth of cut promotes more atoms to transfer into the amorphous structure due to larger impaction [ 81 ]. Compared with monocrystalline SiC, the microstructure in polycrystalline makes the SiC more soften by generating less normal scratching force and amorphous structure phase transition and thinner plastic deformation induced SSD [ 91 ]. Dislocation propagation and phase transition analysis could explain the mechanism in machining process.…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Molecular Dynamics Study on Tip-Based Nanomachining: A Review

et al. 2020

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Tip-based nanomachining (TBN) approaches has proven to be a powerful and feasible technique for fabrication of microstructures. The molecular dynamics (MD) simulation has been widely applied in TBN approach to explore the mechanism which could not be fully revealed by experiments. This paper reviews the recent scientific progress in MD simulation of TBN approach. The establishing methods of the simulation model for various materials are first presented. Then, the analysis of the machining mechanism for TBN approach is discussed, including cutting force analysis, the analysis of material removal, and the defects analysis in subsurface. Finally, current shortcomings and future prospects of the TBN method in MD simulations are given. It is hopeful that this review can provide certain reference for the follow-up research.

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Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Molecular Dynamics Study on Tip-Based Nanomachining: A Review

et al. 2020

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“…In general, the diamond tool was regarded as a rigid body to reduce the computing time. [30][31][32] However, due to the super hard property of SiC, tool wear was an important evaluation index to study how to improve the SiC machining technology. Therefore, to investigate the effects of material type and ultrasonic vibration on the tool wear, boundary layer, thermostat layer, and Newtonian layer were defined in both the diamond tool and workpiece.…”

Section: Methodsmentioning

confidence: 99%

Molecular Dynamics Simulation of Nanomachining Mechanism between Monocrystalline and Polycrystalline Silicon Carbide

Liu

Yang

et al. 2021

Advcd Theory and Sims

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As an advanced ceramics material, silicon carbide (SiC) is extensively applied in numerous industries. In this study, molecular dynamics method is used to comparatively investigate the nanomachining mechanism between monocrystalline SiC (mono-SiC) and polycrystalline SiC (poly-SiC) ceramics. Four simulations are performed for the two materials with and without ultrasonic vibration-assisted machining (UVAM). The diamond tool is set as a non-rigid body and vibrated along the depth direction with 100 GHz in frequency and 0.5 nm in amplitude. The effects of material and ultrasonic vibration on the nanomachining mechanism of SiC are analyzed in depth, including the surface generation, subsurface damage, and tool wear. It is determined that the machinability of SiC ceramics can be effectively improved by UVAM. The machining-induced damage extent of poly-SiC is more serious than that of mono-SiC. It is also found that UVAM can effectively reduce the machining-induced damage, decrease the machining resistance, and increase the possibility of ductile removal, but bring about a slightly larger tool wear.

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“…7,9 However, SiC undergoes phase transformation under ablation, 10 irradiation 11 and deformation. 12 For instance, an amorphous-to-crystalline shell-core structure forms under neutron irradiation, becoming a kind of amorphous and crystalline (AAC) composite structure. 13 SiC experiences crystalline-toamorphous transformation by uniaxial compression, 14 low energy ions, 15 scratching, 12 nano-cutting, 16 laser ablation driven shock compression, 10 ion irradiation, 17 and pressure and shear in a rotational diamond anvil cell, 18 forming an AAC composite structure.…”

Section: Introductionmentioning

confidence: 99%

“…12 For instance, an amorphous-to-crystalline shell-core structure forms under neutron irradiation, becoming a kind of amorphous and crystalline (AAC) composite structure. 13 SiC experiences crystalline-toamorphous transformation by uniaxial compression, 14 low energy ions, 15 scratching, 12 nano-cutting, 16 laser ablation driven shock compression, 10 ion irradiation, 17 and pressure and shear in a rotational diamond anvil cell, 18 forming an AAC composite structure. After electrical discharge machining on a SiC surface, a re-solidified layer is produced, consisting of polycrystalline SiC, a graphite layer, amorphous Si, carbon (C) and nanocrystalline SiC, forming an AAC structure.…”

Section: Introductionmentioning

confidence: 99%