Molecular dynamics study of lattice rearrangement under mechanically activated diffusion

Nikonov, A. Yu.; Konovalenko, Iv. S.; Дмитриев, А. И.

doi:10.1134/s1029959916010082

Cited by 37 publications

(16 citation statements)

References 17 publications

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“…The thickness of curves corresponds to welding processes without (thin) and with (fat) vibration impact. (Nikonov et al, 2015) According to Dmitriev et al (2014) and Nikonov et al (2015Nikonov et al ( , 2016, the present computer model should provide better understanding of the basic laws on the origin of structural inhomogeneity in FSW processes. As a conclusion, it cannot be deny that some difficulties may arise to integrate results of molecular dynamics simulations at macro-scale.…”

Section: B Resultsmentioning

confidence: 96%

“…According to authors, this use should increase the bond strength along weld line. Nikonov et al (2016) have proposed more recently some extensions of this simulation in order to investigate influence of increased vibration frequency and amplitude also considering two crystallites of same compositions. These calculations demonstrate that increasing the vibration frequency to improves the penetration depth of atoms from one crystallite to another in the interfacial region.…”

Section: B Resultsmentioning

confidence: 99%

“…At a lower scale, numerous approaches are available in literature to follow precipitate evolution based on molecular dynamics or Monte-Carlo model. Some developments have been proposed to apply these models to FSW process as the activities previously detailed of Dmitriev et al (2014), Nikonov et al (2015) and Nikonov et al (2016) in molecular dynamics. However this modelling is limited considering the complexity of stirring processes and coupling of physical phenomena in FSW.…”

Section: Numerical Developmentmentioning

confidence: 99%

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A review of microstructural changes occurring during FSW in aluminium alloys and their modelling

Jacquin

Guillemot

2021

Journal of Materials Processing Technology

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Friction stir welding (FSW) process is currently considered as a promising alternative to join aluminium alloys. Indeed, this solid-state welding technique is particularly recommended for the assembly of these materials. Since parts are not heated above their melting temperature, FSW process may prevent solidification defects encountered in joining aluminium alloys and known as limitations to the dissemination of these materials in industries. During the past years, large literature has been devoted to the modelling of microstructural evolution in aluminium alloys during FSW processes and mainly dedicated to the analysis of precipitate evolutions and grain recrystallization mechanisms. Precipitate size distribution models have aroused widespread interest in recent years demonstrating their relevance to follow precipitation process in multicomponent alloys and multiphase systems. Efficient recrystallization models are also available and based on various grain growth mechanisms. In addition, multi-scale coupling strategies have recently emerged considering thermal, mechanical and metallurgical solutions. Consequently, the effect of FSW process parameters on weld properties is now investigated to determine optimized welding strategies regarding microstructure evolution. This research is based on reliable models reported in the literature enhancing the estimation of final weld state and associated properties as an answer to industrial needs. Validations of proposed modelling strategies have been reported based on in-depth analyses of experimental observations. This present work proposes a review of recent models dedicated to microstructural evolutions in aluminium alloys during FSW process. The interest and efficiency of current approaches will be discussed to highlight their limitations. Guidelines will propose new routes toward enhanced modelling strategies for future developments.

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Section: B Resultsmentioning

confidence: 96%

Section: B Resultsmentioning

confidence: 99%

Section: Numerical Developmentmentioning

confidence: 99%

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A review of microstructural changes occurring during FSW in aluminium alloys and their modelling

Jacquin

Guillemot

2021

Journal of Materials Processing Technology

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“…The method of MD simulation is mainly built by the solution of the Newtonian equation of motion numerically which runs under a particular ensemble of atoms where can be used to investigate the material behaviors [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In the application of diffusion welding, there are several investigations using MD simulation like, Chen et al when perform an investigation of diffusion bonding between Cu-Ag [5] and Cu-Al [6] which revealing the mechanism of diffusion bonding and shed light on the importance of pressure, temperature, and surface roughness on the process.…”

Section: mentioning

confidence: 99%

Atomistic investigation on the effect of temperature on mechanical properties of diffusion-welded Aluminium-Nickel

Zaenudin¹,

Mohammed²,

Al-Zubaidi³

2020

IJIE

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Joining two or more parts one of the industrial manufacturing processes required to satisfy the shape that either for functionality and appearance [1]. Several joining techniques have been proposed to satisfy these needs, and have shown very good performance for several applications, such as joining both similar and dissimilar metals [2]. By tracing the history of joining processes, at the first place, joining processes requires sort of fusion between the two, which in some cases will either reduce the performance of the material and sometimes also introducing several crack growth and embrittlement because it involves rapid solidification processes, thus heat treatment is necessary [3]. Furthermore, these techniques require other complex techniques to achieve an optimum parameter makes it economically not applicable [4]. Nowadays, solid-state welding in which the fusion of the materials during joining processes could be avoided is introduced. One of the methods of solid-state welding that is now widely used is diffusion-welding. Instead of only could be used for joining pure materials that are less complex, these techniques could also deal with the more complex materials ranging from alloys, compounds, several polymers, and so forth.

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“…It is shown in a number of studies, that it is possible to form interfacial non-equilibrium structures by shear deformation that exists only during the stage of the active loading [6,7]. At the same time, due to a great variety and transience of the processes as well as the complexity of the experimental observation of deformation mechanisms realized near the interfaces, the methods of computer simulation can be considered as a useful tool [8][9][10][11]. In particular, molecular dynamics (MD) simulation appears to be a good method to follow the atomic ensemble evolution under such a loading.…”

Section: Introductionmentioning

confidence: 99%

Features of the Σ5 and Σ9 Grain Boundaries Migration in BCC and FCC Metals Under Shear Loading – A Molecular Dynamics Study

Дмитриев

Nikonov

2017

FU Mech Eng

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Abstract. Molecular dynamics simulation of metallic bicrystals has been carried out to investigate the behavior of the symmetrical tilt grain boundaries under shear loading. Σ5 and Σ9 grain boundaries in Ni and α-Fe were analyzed. It is found that behavior of the defect depends not only on the structure of boundaries but also on the type of crystal lattice. In particular it is shown that under external stress the grain boundary (GB) behaves differently in the BCC and FCC metal. A comparison of the values of displacement of various types of GB

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Molecular dynamics study of lattice rearrangement under mechanically activated diffusion

Cited by 37 publications

References 17 publications

A review of microstructural changes occurring during FSW in aluminium alloys and their modelling

A review of microstructural changes occurring during FSW in aluminium alloys and their modelling

Atomistic investigation on the effect of temperature on mechanical properties of diffusion-welded Aluminium-Nickel

Features of the Σ5 and Σ9 Grain Boundaries Migration in BCC and FCC Metals Under Shear Loading – A Molecular Dynamics Study

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