Screening of the elastic field in a dislocation ensemble

Sarafanov, G. F.

doi:10.1134/1.1130087

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…copper, aluminium, nickel) and alloys (e.g. stainless steel, α-brass) [36][37][38]. Such a shift of the AE PSD to the high frequency domain is commonly associated with a reduction in the dislocation mean free path.…”

Section: Cluster Analysis Of Ae Time Seriesmentioning

confidence: 97%

Deformation mechanisms underlying tension–compression asymmetry in magnesium alloy ZK60 revealed by acoustic emission monitoring

Vinogradov

Orlov

Danyuk

et al. 2015

Materials Science and Engineering: A

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Section: Cluster Analysis Of Ae Time Seriesmentioning

confidence: 97%

Deformation mechanisms underlying tension–compression asymmetry in magnesium alloy ZK60 revealed by acoustic emission monitoring

Vinogradov

Orlov

Danyuk

et al. 2015

Materials Science and Engineering: A

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“…In that case the stress field of a given dislocation beyond ≃ R/2, where R is the mean interdislocation separation, is largely cancelled out by the stress fields of the other dislocations in the complex array [26,27]. The line tension is then the sum of the core energy plus the elastic energy inside a cylinder of radius R/2 [26]:…”

Section: Statistical Mechanics Of Dislocation Loops On a Latticementioning

confidence: 99%

“…The line tension, i.e., the dislocation self-energy per unit length, is assumed to be that of a dislocation in a complex array, or tangle, of other dislocations. In that case the stress field of a given dislocation beyond ≃ R/2, where R is the mean interdislocation separation, is largely cancelled out by the stress fields of the other dislocations in the complex array [26,27]. The line tension is then the sum of the core energy plus the elastic energy inside a cylinder of radius R/2 [26]:…”

Section: Statistical Mechanics Of Dislocation Loops On a Latticementioning

confidence: 99%

“…Our theory of dislocation-mediated melting was developed in the approximation that dislocations are non-interacting. This approximation is good only in the vicinity of melt where the dislocation density is very high and the otherwise long-range interactions are sufficiently screened [27]. The statistical mechanics of non-interacting dislocations on a lattice yields simple, accurate relations between the dislocation density at melt and both the melting temperature and latent heat of fusion, despite the indeterminacy of the parameter q that takes into account the possible non-Brownian nature of the dislocation network.…”

Section: Volume Change At Meltmentioning

confidence: 99%

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Melting as a dislocation-mediated phase transition

2000

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We present a theory of the melting of elemental solids as a dislocation-mediated phase transition. We model dislocations near melt as non-interacting closed strings on a lattice. In this framework we derive simple expressions for the melting temperature and latent heat of fusion that depend on the dislocation density at melt. We use experimental data for more than half the elements in the Periodic Table to determine the dislocation density from both relations. Melting temperatures yield a dislocation density of (0.61 ± 0.20) b −2 , in good agreement with the density obtained from latent heats, (0.66 ± 0.11) b −2 , where b is the length of the smallest perfect-dislocation Burgers vector. Melting corresponds to the situation where, on average, half of the atoms are within a dislocation core.

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“…В настоящей работе обобщены результаты [10][11][12][13][14] аналитического рассмотрения экранирования упругих полей первичных мезодефектов ансамблем движущихся дислокаций и показана роль этого эффекта в формировании разориентированных структур в процессе пластической деформации.…”

Section: Introductionunclassified

Screening of mesodefect stress fields by ensemble of moving dislocations and misorientation regions formation during plastic deformation of metals

Sarafanov¹,

Перевезенцев²

2011

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Представлены результаты аналитических исследований самосогласованной динамики дислокационного ансамбля в упругом поле мезодефектов (стыковой дисклинации, дисклинационного диполя, планарного мезодефекта). Показано, что упругие поля мезодефектов вызывают возмущение ламинарного потока дислокаций в результате чего формируются области повышенной плотности дислокационного заряда. Такое перераспределение дислокаций эффективно экранирует упругие поля мезодефектов, существенно понижает энергию системы и создает предпосылки для формирования разориентированных областей -оборванных субграниц вдоль линий экстремумов дислокационного заряда.Ключевые слова: дислокации, дисклинации, мезодефекты, экранирование, разориентированные области.The results of analytical studies of self-consistent dynamics of a dislocation ensemble in mesodefects (junction disclination, disclination dipole, planar mesodefect) elastic fields are presented. It is shown that mesodefects elastic fields disturb laminar flow of dislocations and course formation of increased dislocation charge density regions. Such redistribution of dislocations effectively screen mesodefect elastic fields, essentially decrease the energy of system and creates the preconditions for the formation of misoriented regions -broken sub-boundaries along the lines of dislocation charge extremum.

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Screening of the elastic field in a dislocation ensemble

Cited by 9 publications

References 2 publications

Deformation mechanisms underlying tension–compression asymmetry in magnesium alloy ZK60 revealed by acoustic emission monitoring

Deformation mechanisms underlying tension–compression asymmetry in magnesium alloy ZK60 revealed by acoustic emission monitoring

Melting as a dislocation-mediated phase transition

Screening of mesodefect stress fields by ensemble of moving dislocations and misorientation regions formation during plastic deformation of metals

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