Nanoscale Friction Behavior of the Ni-Film/Substrate System Under Scratching Using MD Simulation

Liu, Xiaoming; Liu, Z. L.; Wei, Yueguang

doi:10.1007/s11249-012-9932-9

Cited by 21 publications

(8 citation statements)

References 46 publications

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“…The crystallographic orientation-dependent indentation response of single-crystalline face centered cubic (fcc) metals under the localized uniaxial stress state, determined by the activation of {1 1 1} 1 1 0 slip systems, has been well examined [25,26]; however, the localized multi-axis stress state during friction causes a complex tribological response with respect to the crystallographic orientation [27,28]. On the other side, the internal microstructures have a strong impact on the tribological response of materials [29,30]. Compared with the dislocation activity-dominated plasticity in single-crystalline Cu, there is increased uncertainty in the crystallographic orientation dependence of the friction of NT Cu, as TBs can act as both sources and sinks for dislocations, or migrate themselves [8,9,12,16,17,31].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of anisotropic friction in nanotwinned Cu revealed by atomistic simulations

Zhang

Hartmaier

Wei

et al. 2013

Modelling Simul. Mater. Sci. Eng.

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The nature of nanocrystalline materials determines that their deformation at the grain level relies on the orientation of individual grains. In this work, we investigate the anisotropic response of nanotwinned Cu to frictional contacts during nanoscratching by means of molecular dynamics simulations. Nanotwinned Cu samples containing embedded twin boundaries parallel, inclined and perpendicular to scratching surfaces are adopted to address the effects of crystallographic orientation and inclination angle of aligned twin boundaries cutting the scratching surface. The transition in deformation mechanisms, the evolution of friction coefficients and the friction-induced microstructural changes are analyzed in detail and are related to the loading conditions and the twinned microstructures of the materials. Furthermore, the effect of twin spacing on the frictional behavior of Cu samples is studied. Our simulation results show that the crystallographic orientation strongly influences the frictional response in different ways for samples with different twin spacing, because the dominant deformation mode varies upon scratching regions of different orientations. A critical inclination angle of 26.6• gives the lowest yield strength and the highest friction coefficient, at which the plasticity is dominated by twin boundary migration and detwinning. It is demonstrated that the anisotropic frictional response of nanotwinned Cu originates from the heterogeneous localized deformation, which is strongly influenced by crystallographic orientation, twin boundary orientation and loading condition.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of anisotropic friction in nanotwinned Cu revealed by atomistic simulations

Zhang

Hartmaier

Wei

et al. 2013

Modelling Simul. Mater. Sci. Eng.

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“…The tilt effect on microstructure evolution is shown in Fig. 7, the atoms are colored according to local crystalline order analysis [24]. Large area of stacking fault and local slips (arrows in the figure) can be seen with g z ¼ À20 , as shown in Fig.…”

Section: Local Plasticity Analysismentioning

confidence: 97%

“…As shown in Fig. 11(b), g x changes from 0 to À20 (20 ), change of the scratch force [24]. The graphs are generated by Visual Molecular Dynamics (VMD) [25].…”

Section: Nano-scale Contact Forces and Hardnessmentioning

confidence: 99%

Ploughing friction and nanohardness dependent on the tip tilt in nano-scratch test for single crystal gold

刘小明

et al. 2015

Computational Materials Science

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a b s t r a c tDifferent from macro-scale scratch, in nano-scale scratch test, the scratching tip is easily tilted, which may display a considerable change of the friction behavior. The ploughing friction and nanohardness dependent on the tip tilt in nano-scratch test for single crystal gold is studied in this paper by using molecular dynamics simulations. The results show that tilting forward (backward) to the scratch direction has a larger effect on the friction coefficient than the case of tilting laterally to the scratch direction. Scratch hardness is also sensitive to the tip tilting forward (backward), while it is insensitive to the tip tilting laterally. Moreover, the local plastic behaviors near tip (pile-up, plastic area, and dislocation evolution) are also dependent on the tip tilt, which may be a major contribution to the mechanism of the nano-scale wear.

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“…A simpler scenario is the cutting of polycrystals. Liu et al [22] studied scratching in a bi-crystal Ni film containing a 5 twist grain boundary; they find that the interface may absorb plastic deformation and allow grain boundary slip, thus decreasing the friction during scratch.…”

Section: Introductionmentioning

confidence: 99%

Cutting of Al/Si bilayer systems: molecular dynamics study of twinning, phase transformation, and cracking

Vardanyan

Zhang

Alhafez

et al. 2020

Int J Adv Manuf Technol

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Using the molecular dynamics simulation, we study the cutting of Al/Si bilayer systems. While the plasticity of metals is dominated by dislocation activity, the deformation behavior of Si crystals is governed by phase transformations-here to the amorphous phase. We find that twinning adds as a major deformation mechanism in the cutting of Al crystals. Cutting of Si crystals requires thrust forces that are larger than the cutting forces in order to induce amorphization; in metals, the thrust forces are relatively smaller than the cutting forces. When putting an Al top layer on a Si substrate, the thrust force is reduced; the opposite effect is observed if a Si top layer is put on an Al substrate. Covering an Al substrate with a thin Si top layer has the detrimental effect that the hard Si requires high pressures for cutting; as a consequence, twinning planes with intersecting directions are generated that ultimately lead to cracks in the ductile Al substrate. The crystallinity of the Si chip is strongly changed if an Al substrate is put under the Si top layer: With decreasing thickness of the Si top layer, the Si chip retains a higher degree of crystallinity.

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Nanoscale Friction Behavior of the Ni-Film/Substrate System Under Scratching Using MD Simulation

Cited by 21 publications

References 46 publications

Mechanisms of anisotropic friction in nanotwinned Cu revealed by atomistic simulations

Mechanisms of anisotropic friction in nanotwinned Cu revealed by atomistic simulations

Ploughing friction and nanohardness dependent on the tip tilt in nano-scratch test for single crystal gold

Cutting of Al/Si bilayer systems: molecular dynamics study of twinning, phase transformation, and cracking

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