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Author
dc.contributor.author
Wu, RH 
Author
dc.contributor.author
Tuzes, D 
Author
dc.contributor.author
Ispanovity, PD 
Author
dc.contributor.author
Groma, I 
Author
dc.contributor.author
Hochrainer, T 
Author
dc.contributor.author
Zaiser, M 
Availability Date
dc.date.accessioned
2019-09-27T11:05:33Z
Availability Date
dc.date.available
2019-09-27T11:05:33Z
Release
dc.date.issued
2018
uri
dc.identifier.uri
http://hdl.handle.net/10831/43570
Abstract
dc.description.abstract
We study a continuum model of dislocation transport in order to investigate the formation of heterogeneous dislocation patterns. We propose a physical mechanism that relates the formation of heterogeneous patterns with a well-defined wavelength to the stress-driven dynamics of dislocation densities that tries to minimize the internal energy while subject to dynamic constraints and a density-dependent, friction-like flow stress. This leads us to an interpretation that resolves the old "energetic vs dynamic" controversy regarding the physical origin of dislocation patterns and emphasizes the hydrodynamic nature of the instability that leads to dislocation patterning, which we identify as an instability of dislocation transport that is not dependent on processes such as dislocation multiplication or annihilation. We demonstrate the robustness of the developed patterning scenario by considering the simplest possible case (plane strain, single slip) in two model versions that consider the same driving stresses but implement the transport of dislocations that controls dislocation density evolution in two very different manners, namely (i) a hydrodynamic formulation that considers transport equations that are continuous in space and time, assuming that the dislocation velocity depends linearly on the local driving stress, and (ii) a stochastic cellular automaton implementation that assumes spatially and temporally discrete transport of discrete "packets" of dislocation density that move according to an extremal dynamics. Despite the differences, we find that the emergent patterns in both models are mutually consistent and in agreement with the prediction of a linear stability analysis of the continuum model. We also show how different types of initial conditions lead to different intermediate evolution scenarios that, however, do not affect the properties of the fully developed patterns.hu_HU
Language
dc.language
Angol
Language
dc.language.iso
angolhu_HU
Title
dc.title
Instability of dislocation fluxes in a single slip: Deterministic and stochastic models of dislocation patterninghu_HU
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2019-09-25T13:14:35Z
Version
dc.description.version
megjelent változathu_HU
Language
dc.language.rfc3066
eng
Doi ID
dc.identifier.doi
10.1103/PhysRevB.98.054110
Wos ID
dc.identifier.wos
000442662500001
ID Scopus
dc.identifier.scopus
85052682802
MTMT ID
dc.identifier.mtmt
3419423
Issue Number
dc.identifier.issue
5hu_HU
abbreviated journal
dc.identifier.jabbrev
PHYS REV Bhu_HU
Journal
dc.identifier.jtitle
PHYSICAL REVIEW Bhu_HU
First Page
dc.identifier.spage
054110hu_HU
Volume Number
dc.identifier.volume
98hu_HU
access
dc.rights.access
hozzáférhetőhu_HU
Class
dc.type.genre
publikáció/alkotáshu_HU
Type
dc.type.resrep
tudományoshu_HU
Author
dc.contributor.inst
ELTE Természettudományi Kar Fizikai Intézet Anyagfizikai Tanszékhu_HU
Type
dc.type.type
folyóiratcikkhu_HU
Release Date
dc.description.issuedate
2018hu_HU
department of Author
dc.contributor.institution
Fizika Doktori Iskola
department of Author
dc.contributor.institution
Anyagfizikai Tanszék
Author institution
dc.contributor.department
Anyagfizikai Tanszék
Author institution
dc.contributor.department
Anyagfizikai Tanszék
Author institution
dc.contributor.department
Anyagfizikai Tanszék


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Instability of dislocation fluxes in a single slip: Deterministic and stochastic models of dislocation patterning
 

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