On the mechanisms of mass transfer during nanoindentation

The problem of the diffusion evolution of a pore filled with molecular hydrogen in a spherical granule in a hydrogen medium is solved. The initial position of the pore is displaced relative to the center of the granule. A nonlinear system of equations is obtained, which describes the behavior of the size of the gas-filled pore, the amount of gas in it and its position relative to the center of the bounded particle with time. Numerical calculations have shown the existence of two stages of evolution. The first (fast) stage is associated with the equalization of pressure in the pore with the external. The second is the slow diffusion “healing” of the pore, when the amount of gas adjusts to its size and the gas pressure is approximately equal to the external.

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“…The main contribution to this theory was made by V.V. Slezov and his students [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Diffusion Evolution of a Pore in Bounded Particle in a Hydrogen Atmosphere

Kopp¹,

Ostapchuk²,

Yanovsky³

2022

Problems of Atomic Science and Technology

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“…It is widely known that different types of point defects such as vacancies, interstitials and their complexes, play a very important role in mass transfer in crystals and their contribution largely increases in non-equilibrium conditions caused by external impacts, e.g., plastic deformation, irradiation, heat treatment, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Crowdion is a sort of interstitial atom when an extra atom is positioned in a closepacked atomic row.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Stability of Subsonic Crowdion Clusters in 2D Morse Crystal

Korznikova

Shepelev

Chetverikov

et al. 2018

J. Exp. Theor. Phys.

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Recently, the concept of supersonic N-crowdions was offered. In molecular dynamics simulations, they can be excited by initial kick of N neighboring atoms located in one close-packed atomic row along this row. In the present study, in 2D Morse crystal, we apply initial kick to M neighboring atoms located in neighboring close-packed atomic rows along these rows. This way, we initiate crowdion clusters called subsonic Mcrowdions. It is well known that static 1-crowdion in 2D Morse lattice is unstable; as a result, the interstitial atom leaves the close-packed atomic row and becomes immobile. However, we show that 1-crowdion moving with sufficiently large subsonic velocity remains in the close-packed atomic row. Crowdion clusters with M equal to or greater than 2 appear to be stable even at rest, with growing M transforming into prismatic dislocation loops. It is important to note that stable subsonic M-crowdions (M > 1) remain mobile and they can carry interstitial atoms over long distances.

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“…Так, в относительно недавних работах было показано, что краудионы играют очень важную роль в термически пу-сковом перемещении межузельных ато мов [5,6]. Кроме того, краудионы содействуют массопе реносу при пла-стической деформации [7][8][9]. Было также обнаружено, что диффузия на некоторых напряженных поверхностях может быть промежуточ ным механизмом массоперено-са посредством форми рования и движения поверхност-ного краудиона [10].…”

Section: Introductionunclassified

Crowdion interaction with the boundary of bimetallic Ni-Al in the 2D model

Старостенков¹,

Zakharov²,

Medvedev³

2011

LoM

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Методом молекулярной динамики исследуется взаимодейст вие краудиона с границей биметалла. Уста-новлено, что при столкновении краудиона с дислока-цией несоответствия на границе биметалла порождает-ся продольная волна атомных смещений, которая может приводить к направленному дрейфу вакансий в сто рону границы биметалла.Ключевые слова: молекулярная динамика, краудион, биме-талл, вакансия.Molecular dynamics method is used to study the interaction of crowdion with the bimetallic boundary. It is established that the collision of crowdion with a misfit dislocation at the bimetallic boundary generates a longitudinal wave of atomic displacements, which can lead to directional drift of vacancies toward the bimetallic boundary.

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On the mechanisms of mass transfer during nanoindentation

Cited by 9 publications

References 4 publications

Diffusion Evolution of a Pore in Bounded Particle in a Hydrogen Atmosphere

Diffusion Evolution of a Pore in Bounded Particle in a Hydrogen Atmosphere

Dynamics and Stability of Subsonic Crowdion Clusters in 2D Morse Crystal

Crowdion interaction with the boundary of bimetallic Ni-Al in the 2D model

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