A Numerical Analysis of Deformation Processes in Oxide Dispersion-Strengthened Materials – Influence of Dislocation-Particle Interactions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00467048" target="_blank" >RIV/68081723:_____/17:00467048 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.258.106" target="_blank" >http://dx.doi.org/10.4028/www.scientific.net/SSP.258.106</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.258.106" target="_blank" >10.4028/www.scientific.net/SSP.258.106</a>

Result language

angličtina

Original language name

A Numerical Analysis of Deformation Processes in Oxide Dispersion-Strengthened Materials – Influence of Dislocation-Particle Interactions

Original language description

A recently developed 3D discrete dislocation dynamics (DDD) model is employed to studynkinetics of dislocation ensembles subjected to high temperature creep in microstructures of metalnmatrix composites. We particularly focus on a migration of low angle tilt boundaries in a field of rigidnimpenetrable particles. This type of dislocation boundaries represents a typical microstructural featurenmediating plastic deformation during the high temperature loadings.nThe article compares results of numerical studies that considered distinct dislocation-particle in-nteractions in order to describe the response of dislocation structure to the applied stress. The resultsnsuggest that, regardless the details related to the dislocation-particle interactions, a critical appliednstress always exists, below which the boundary migration process ceases [1, 2]. The existence of crit-nical threshold is confirmed by creep tests of ODS materials. This critical threshold, contrary to thenclassical Orowan stress, is proportional to the dislocation density. The displacements of individualndislocation segments on the micro-scale level reflect the changes in the dislocation-particle interac-ntions quite sensitively. At the macro-scale level, the overall strain rate, which averages out velocities ofnall the individual dislocation segments, is also significantly influenced by the changes in dislocation-nparticle interaction.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Materials Structure & Micromechanics of Fracture VIII

ISBN

978-3-03835-626-4

ISSN

1662-9779

e-ISSN

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Number of pages

4

Pages from-to

106-109

Publisher name

Trans Tech Publications

Place of publication

Zürrich

Event location

Brno

Event date

Jun 27, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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