Nanoindentation/scratching at finite temperatures: Insights from atomistic-based modeling

Chavoshi, Saeed Zare; Xu, Shuozhi

doi:10.1016/j.pmatsci.2018.09.002

Cited by 49 publications

(10 citation statements)

References 210 publications

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“…This is also consistent with a significant reduction in the critical loading (Pc) for the first pop-in event to take place, as seen in Figure 2. This behavior also can be observed in the experimental results of Pt (100) [39] and the multiscale modeling of Al [40] during nanoindentation. The values of hardness and Young's modulus of the Co thin films as a function of annealing temperature are plotted in Figure 3(a).…”

Section: Resultssupporting

confidence: 65%

Influence of Post-Annealing on the Structural and Nanomechanical Properties of Co Thin Films

Hwang

Pan

et al. 2020

Micromachines

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The correlations between the microstructure and nanomechanical properties of a series of thermal annealed Co thin films were investigated. The Co thin films were deposited on glass substrates using a magnetron sputtering system at ambient conditions followed by subsequent annealing conducted at various temperatures ranging from 300 • C to 800 • C. The XRD results indicated that for annealing temperature in the ranged from 300 • C to 500 • C, the Co thin films were of single hexagonal close-packed (hcp) phase. Nevertheless, the coexistence of hcp-Co (002) and face-centered cubic (fcc-Co (111)) phases was evidently observed for films annealed at 600 • C. Further increasing the annealing temperature to 700 • C and 800 • C, the films evidently turned into fcc-Co (111). Moreover, significant variations in the hardness and Young's modulus are observed by continuous stiffness nanoindentation measurement for films annealed at different temperatures. The correlations between structures and properties are discussed.

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Section: Resultssupporting

confidence: 65%

Influence of Post-Annealing on the Structural and Nanomechanical Properties of Co Thin Films

Hwang

Pan

et al. 2020

Micromachines

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“…It is undeniable that MD simulations technology plays an increasingly crucial role in nanomachining process to reveal hitherto unknown phenomena [ 99 ]. This review concluded the recent progress in MD simulation of TBN method, and the above contents are summarized as follows: The establishment of MD models of various materials and related potential function were summarized.…”

Section: Discussionmentioning

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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“…24 As the validity of MD simulations considerably hinges on the choice of interatomic potential, it is crucial to employ an appropriate interatomic potential so as to attain accurate results. [25][26][27][28][29][30] Atomic interactions of SiC are modelled using the effective many-body interatomic potential developed by Vashishta et al, 31 which is capable of reasonably reproducing the generalized stacking fault energies, cohesive energy, elastic constants, and melting point of 3C-SiC. The initial nanocrystalline structure is generated using the Voronoi tessellated method.…”

Section: Simulation Methodologymentioning

confidence: 99%

Tension-compression asymmetry in plasticity of nanotwinned 3C-SiC nanocrystals

Chavoshi

2018

Journal of Applied Physics

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Encompassing nanoscale thin twins in metals induces diverse influences, either strengthening triggered by the lattice dislocation blockage effects or softening prompted by dislocation emission from coherent twin boundary (CTB)/grain boundary (GB) intersections as well as CTB migration; yet the deformation mechanism remains poorly understood in ceramic nanostructures possessing covalent bonds. Here, we report the results of uniaxial compressive and tensile stress loading of twin-free and nanotwinned nanocrystalline cubic silicon carbide (3C-SiC) ceramic attained by large-scale molecular dynamics simulations. We find a strong and unique tension-compression asymmetry in strength of nanocrystalline ceramics, much higher than that of metals. We demystify that strength and ductility behaviour do not correlate simply with the amount of dislocation density, voids, intergranular disordered phase, and total strain energy; instead, it arises from a complex interplay of the aforementioned features and structural characteristics, e.g., GB and triple junction area distribution along/normal to the direction of straining as well as the capability of strain accommodation by the GBs and CTBs, with the dominant role of the structural characteristics in nanotwinned samples. Our results also reveal that primarily intergranular crack propagation and fracture along the GBs transpires, and not along the CTBs, resulting from the high energy of the GBs. However, a high density of nanoscale twins in the 3C-SiC nanocrystals could give rise to the alternation of the crack path from intergranular to intragranular type induced by shear, which brings about the glide of Shockley partials along the CTBs and subsequent formation of CTB steps and twin plane migration.

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Nanoindentation/scratching at finite temperatures: Insights from atomistic-based modeling

Cited by 49 publications

References 210 publications

Influence of Post-Annealing on the Structural and Nanomechanical Properties of Co Thin Films

Influence of Post-Annealing on the Structural and Nanomechanical Properties of Co Thin Films

Molecular Dynamics Study on Tip-Based Nanomachining: A Review

Tension-compression asymmetry in plasticity of nanotwinned 3C-SiC nanocrystals

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