Nanostructures generated by explosively driven friction: Experiments and molecular dynamics simulations

Kim, H.-J.; Emge, A.; Winter, R. E.; Keightley, P. T.; Kim, W.-K.; Falk, Michael L.; Rigney, D.A.

doi:10.1016/j.actamat.2009.07.034

Cited by 45 publications

(31 citation statements)

References 35 publications

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“…The width of the amorphous layer increased with the increasing simulation time [3]. Similar results were obtained for a Fe-Al couple [4]. A three-dimensional (3D) MD simulation of a nanometric scratch test comprising a diamond tool and a copper single crystal was performed by Zhu et al [5].…”

Section: Introductionsupporting

confidence: 57%

“…Thus, carbon atoms with broken bonds to their neighbors can move into the Fe substrate which undergoes amorphization within a certain layer, especially at the higher temperature (Figure 10c). Such behavior was also observed for other systems at ambient temperature featuring both crystalline [1][2][3][4][5] and amorphous [11] materials.…”

Section: Methodsmentioning

confidence: 54%

“…Again, an amorphous layer was observed at the surface and within the formed chip of the softer material, i.e., copper. Whereas the recrystallization of amorphous copper was observed in [4], this was not the case in [5], most likely because a thermostat was incorporated in the model structure. Morita et al presented an extended MD model, taking into account possible chemical reactions between different atomic species [6].…”

Section: Introductionmentioning

confidence: 94%

“…Molecular dynamics (MD) simulations have been performed comprehensively by Rigney and coworkers to show structure formation at the sliding interface of pure crystalline materials [1][2][3][4]. Although only a two-dimensional (2D) model was applied, the following features were visualized on the atomic scale: (i) mixing of the two first body materials; (ii) evolution of defect potential energy in the vicinity of the interface and (iii) formation of nanocrystalline structures [1].…”

Section: Introductionmentioning

confidence: 99%

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MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

2016

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Abstract:The sliding behaviors of two simplified tribofilms with amorphous structure consisting either of SiO 2 molecules or C atoms were simulated by molecular dynamics modeling. The objective was to identify mechanisms explaining the experimentally observed lubricating properties of the two amorphous films. The impacts of layer thickness, normal pressure, temperature and different substrate materials were studied systematically, while the sliding velocity was kept constant at 30 m/s. While the layer thickness was not critical, all the other parameters showed special effects under certain conditions. Normal pressure impeded void formation and could even eliminate voids if applied at high temperature. Stick-slip sliding was changed to smooth sliding at high temperature due to void healing. Considering the carbon film, high friction forces and shearing of the entire film was observed with diamond substrates, whereas interface sliding at low friction forces and an amorphous layer of iron mixed with carbon was observed if the supporting substrates consisted of α-Fe. Both films show a decrease of friction forces and smooth sliding behavior at elevated temperature, corresponding well to the tribological behavior of an advanced nanocomposite sliding against a steel disc under severe stressing conditions when high flash temperatures can be expected.

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Section: Introductionsupporting

confidence: 57%

Section: Methodsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

2016

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“…Several techniques have been developed to measure friction coefficients under these conditions: explosively driven friction test [5], plate impact [6], torsional Kolsky bar set-up [6][7][8][9], dynamometer ring with a rectangular specimen launched by a gas gun or a hydraulic machine [10] and pin-on-disk apparatus [3].…”

Section: Introductionmentioning

confidence: 99%

A friction test between steel and a brittle material at high contact pressures and high sliding velocities

Durand

Bailly

Delvare

et al. 2012

EPJ Web of Conferences

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Abstract. Our aim is to characterize the interface behaviour between an aggregate material and steel. This work focuses on contact pressures and sliding velocities reaching 100 MPa and 10 m/s. The set-up consists in a cylindrical sample of the aggregate material which slips into a steel tube. The tube is both a confinement vessel and a sliding surface. Thanks to confinement, the material can be tested under high stresses without failure. The interface pressure is generated by an axial compression. The sample is pressed on a spring, so it can be simultaneously compressed and rubbed on the tube. The set-up has been tested in the case of a quasi-static loading and the 100 MPa pressure has been reached. Then the set-up was mounted on a Split Hopkinson Pressure Bar device in order to reach higher velocities. Numerical simulations have been realized to check the feasibility and the relevance of this dynamic test. These results are analysed and compared to the experimental ones.

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Effects of Welding Parameter on Atom‐Scale Interfacial Diffusion Behavior of Al/Cu Dissimilar Friction Stir Welding

Dong

et al. 2021

Physica Status Solidi (b)

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The partial weak bonding phenomenon induced by an unsuitable welding parameter often occurs at the joint interface of Al/Cu dissimilar friction stir welding (FSW). Diffusion time, temperature, and pressure are the main factors that affect the diffusion behavior at the interface. Therefore, molecular dynamics (MD) simulation is used to investigate the influence mechanism of these factors from the perspectives of diffusion thickness, total energy, and volume. The diffusion time and the temperature affect the diffusion thickness significantly, whereas external pressure has little impact. The variations of total energy and volume consist of two stages, which are caused by the combined effects of lattice transformation and atomic diffusion. The variation processes of total energy and volume are accelerated with the increase in temperature due to a higher diffusion velocity, and it is delayed by external pressure at a higher temperature because the lattice transformation is inhibited. These findings are beneficial to the choice of welding parameters in actual production.

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Nanostructures generated by explosively driven friction: Experiments and molecular dynamics simulations

Cited by 45 publications

References 35 publications

MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

A friction test between steel and a brittle material at high contact pressures and high sliding velocities

Effects of Welding Parameter on Atom‐Scale Interfacial Diffusion Behavior of Al/Cu Dissimilar Friction Stir Welding

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