Molecular dynamics simulation on formation mechanism of grain boundary steps in micro-cutting of polycrystalline copper

Liu, Dehao; Wang, Gang; Yu, Juan; Ye, Rong

doi:10.1016/j.commatsci.2016.10.001

Cited by 37 publications

(17 citation statements)

References 35 publications

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“…To verify the theory presented by De Oliveira et al [13], the cutting forces were obtained in similar conditions. This was selected once the cutting fluid is directly related to the excitations and forces of the system [21,22]. In figure 3 is possible to observe one of the machined slots in two different regions.…”

Section: Resultsmentioning

confidence: 99%

Influence of Cutting Fluid Application Frequency in Micromilling Cutting Forces

Oliveira

Gomes

Santos

et al. 2021

IJEMM

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Micromachining allows the production of parts and components on a micro scale with high precision and has become a key process to meet the growing demand for micro parts and micro components. To meet the quality requirements of the generated surfaces and reduce the cutting forces, strategies have been analysed, such as the use of the cutting fluid. Therefore, this research aimed to verify the effect of the frequency of the use of cutting fluid during the micro-milling of the Inconel 718 alloy. For this purpose, an ultra-refined cemented carbide micro end mill coated with (Al, Ti) N and 400 µm in diameter was used. A spindle speed of 20,000 rpm, a cutting speed of 13.8 m/min, a feed per tooth of 5 µm/tooth and an axial depth of cut of 40 µm were used as cutting parameters. Two frequencies of application of the cutting fluid were evaluated, corresponding to the flow rate of 40.7 and 270.0 ml/ h, in addition to the dry test. To measure the cutting forces, a Kistler dynamometer with operating range of -5 kN to +10 kN was used. In addition, the process simulation was performed using the AdvantEdge software by ThirdWave Systems. The results showed that the higher flow of the cutting fluid provided lower cutting forces and that, in dry machining, the cutting force increased significantly during the machining of a slot.

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Section: Resultsmentioning

confidence: 99%

Influence of Cutting Fluid Application Frequency in Micromilling Cutting Forces

Oliveira

Gomes

Santos

et al. 2021

IJEMM

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“…They further pointed out that the grain structure of metal substrate is the ultimate limit to the achievable surface roughness. Liu et al explored the formation mechanism of the step structure for polycrystalline copper, and claimed that the misalignment in the slip direction between the sub-grains and the original grains results in the step structure [108]. To explain the step structure on the diamond turned surface of polycrystalline copper, a theoretical formula for the value of material spring back in diamond turning is developed in [28], and the formation of step structure on the machined surface is reported to heavily depend on the Young’s modulus of the neighbouring grain and their grain boundary.…”

Section: Theoretical Modelsmentioning

confidence: 99%

Influencing Factors and Theoretical Models for the Surface Topography in Diamond Turning Process: A Review

Zong

2019

Micromachines

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In this work, the influencing factors and corresponding theoretical models for the surface topography in diamond turning process are reviewed. The surface profile on one tool feed is the elementary unit of surface topography. The influences coupled with the models of the duplication effect of the tool edge profile, material spring back, and plastic side flow are outlined in this part. In light of the surface profile on one tool feed and “trim principle”, the modeling methods of surface topography along the radial direction (2D surface topography) are commented. Moreover, the influence of the vibration between the diamond tool and workpiece on the 2D surface topography is discussed, and the theoretical models are summarized. Finally, the issues for modeling of 3D surface topography, particularly the influences of material defects, are analyzed. According to the state-of-the-art surface topography model of the diamond turned component, future work in this field is therefore predicted.

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“…Classical MD simulations are only based on the semi-empirical model of interatomic interactions and give proper results if the empirical interatomic potential is properly parameterized. Starting from the pioneering works 3 – 10 , various properties and phenomena in nanocrystalline solids were thoroughly investigated within MD studies (see recent papers 11 – 14 ). Most of those MD studies dealt with a local structure and the properties of grain boundaries (local stresses, defect mobility under external stress, emission of dislocations by grain boundaries and their interaction with dislocations etc. )…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of the effect of extended ingrain defects on grain growth kinetics in nanocrystalline copper

Dremov

Chirkov

Karavaev

2021

Sci Rep

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The paper presents results of a large-scale classical molecular dynamics study into the effect of ingrain defects on the grain growth rate of face centered cubic nanocrystalline material under thermal annealing. To do this, two types of virtual MD samples are used. The samples of the first type are constructed artificially by filling Voronoi cells with atoms arranged in fcc lattice essentially with no ingrain defects. The other samples are obtained by natural crystallization from melted material and contain numerous extended ingrain defects. These samples with a high concentration of ingrain defects imitate nanocrystalline material produced by severe plastic deformation via high pressure torsion or equal channel angular extrusion. The samples of both types are subjected to long-time zero pressure isothermal annealing at $$T\approx 0.9T_m$$ T ≈ 0.9 T m ($$T_m$$ T m is melting temperature) which leads to grain coarsening due to recrystallization. Direct molecular dynamics simulations of the annealing of different samples show that at the same conditions recrystallization goes two times faster in the samples with a high concentration of extended ingrain defects than in the defect-free samples. That is, to increase the thermal stability of nanostructured material the technologies used for forming nanocrystalline structures should be developed so as to avoid the thermomechanical treatment regimes leading to the formation of structures with high concentration of ingrain defects.

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Molecular dynamics simulation on formation mechanism of grain boundary steps in micro-cutting of polycrystalline copper

Cited by 37 publications

References 35 publications

Influence of Cutting Fluid Application Frequency in Micromilling Cutting Forces

Influence of Cutting Fluid Application Frequency in Micromilling Cutting Forces

Influencing Factors and Theoretical Models for the Surface Topography in Diamond Turning Process: A Review

Molecular dynamics study of the effect of extended ingrain defects on grain growth kinetics in nanocrystalline copper

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