Investigation of reorganization of a nanocrystalline grain boundary network during biaxial creep deformation of nanocrystalline Ni using molecular dynamics simulation

Pal, Snehanshu; Meraj, Md.

doi:10.1007/s00894-019-4177-2

Cited by 7 publications

(2 citation statements)

References 82 publications

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“…When the grain rotates to a specific direction, the stress will release due to dislocation slip. At this time, the driving force of grain rotation disappears, and the grain stops rotation, thus forming a shear texture [23,24]. With the increase of engineering strain, a large shear deformation occurs in the sample, resulting in the formation of rotation cubic shear texture.…”

Section: Resultsmentioning

confidence: 99%

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

2021

Discrete Dynamics in Nature and Society

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The mechanical behavior of the extruded 7003-T6 aluminum profiles used as automotive buffer beams is investigated. The correlation of the texture and the formation of the adiabatic shear band is analyzed. Copper texture, R texture, and S texture are the main reasons for the anisotropy of mechanical behavior of the profile, resulting in that the stress of the profile along the extrusion direction is higher than that perpendicular to the extrusion direction. Through finite element modeling (FEM), it can be found that the adiabatic shear band is developed in the sample if the dynamic loading direction is parallel to the extrusion direction, but it does not appear if the loading direction is perpendicular to the extrusion direction. When the dynamic loading direction is parallel to the extrusion direction, higher stress results in a lower energy barrier for shear localization. Therefore, the formation of the adiabatic shear band is susceptible along but is not sensitive perpendicular to the extrusion direction. This study provides technical support for the service of 7003 aluminum alloy in automobiles, which has important academic and engineering application value.

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Section: Resultsmentioning

confidence: 99%

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

2021

Discrete Dynamics in Nature and Society

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“…Although MD simulation suffers from the limitation of the relatively short time scale and insufficient model size, EAM potential can still be successfully applied to the simulation of vacancy and dislocation activity in metals [16,17], and the characteristics of the obtained creep curve are the same as the three stages of actual creep: initial creep, stable creep, and accelerated creep [18][19][20][21][22]. In addition, the deformation mechanism has also been noted to be consistent with the actual high-temperature creep mechanism [23][24][25]. Pure crystalline Ni, which possesses a face-centered cubic (FCC) crystal structure and has strong solid solution ability [26][27][28], is a typical material to explore the creep deformation mechanism of nanocrystalline metals.…”

Section: Introductionmentioning

confidence: 84%

Initial Vacancy-Dependent High-Temperature Creep Behavior of Nanocrystalline Ni by Molecular Dynamics Simulation

Cui,

Shao,

Shi

et al. 2024

Coatings

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Nanocrystalline metals possessing excellent mechanical strength have great potential to replace traditional metal materials as structural materials, but their poor resistance to creep deformation seriously restricts their engineering applications at high temperatures. The high-temperature creep behavior of nanocrystalline Ni with different volume fractions of initial vacancies ranging from 0% to 10% was studied systematically by molecular dynamics simulation in this study. The results showed that the steady-state creep displacement first increased and then decreased with increasing initial vacancy concentration, reaching the maximum when the initial vacancy concentration was 6%. The microstructural characteristics, such as quantity increment and distribution of the vacancies, the number and types of dislocations, and shear strain distribution during creeping, were analyzed in detail. The deformation-induced vacancies formed at the grain boundary (GB) in the initial creep stage, and their variation trend with the initial vacancy concentration was consistent with that of the creep displacement, indicating that the initial vacancy-dependent high-temperature creep behavior of nanocrystalline Ni was mainly determined by the rapidly increasing number of vacancies at the GB in the initial creep stage. Afterwards, the deformation-induced, vacancy-assisted 1/6{112} Shockley partial dislocation activities dominated the creep deformation of nanocrystalline Ni in the steady-state creep stage. The results can provide theoretical support for expanding the application of nanocrystalline metals from the perspective of crystal defect engineering.

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Creep in Nanostructured Materials

Cavaliere

2020

Fatigue and Fracture of Nanostructured Materials

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Investigation of reorganization of a nanocrystalline grain boundary network during biaxial creep deformation of nanocrystalline Ni using molecular dynamics simulation

Cited by 7 publications

References 82 publications

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

Initial Vacancy-Dependent High-Temperature Creep Behavior of Nanocrystalline Ni by Molecular Dynamics Simulation

Creep in Nanostructured Materials

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