High temperature dislocation processes in precipitation hardened crystals investigated by a 3D discrete dislocation dynamics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00480710" target="_blank" >RIV/68081723:_____/17:00480710 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijplas.2017.04.017" target="_blank" >http://dx.doi.org/10.1016/j.ijplas.2017.04.017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijplas.2017.04.017" target="_blank" >10.1016/j.ijplas.2017.04.017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High temperature dislocation processes in precipitation hardened crystals investigated by a 3D discrete dislocation dynamics

Popis výsledku v původním jazyce

3D discrete dislocation dynamics is employed to investigate motion of general mixedndislocation segments subjected to high temperature loadings in microstructures withnimpenetrable particles. The implementations of the model first address several benchmarknprocesses including shrinkage of a glissile dislocation loop driven by self-stresses and annannihilation of mutually interacting co-axial prismatic dislocation loops. In particular, wenshow that models of the microstructure with planar and/or translational symmetrynimprove efficiency, speed and stability of the calculations. Our simulations then focus onnmigration of low angle dislocation boundaries in an array of particles while taking intonaccount all mutual dislocation-dislocation interactions and the action of an externallynapplied stress. The results show for the first time that the migration of tilt dislocationnboundaries in crystals with particles can be associated with threshold stresses. Thencalculated thresholds are in a good agreement with experimental threshold stresses thatncharacterize creep behaviour of precipitation hardened alloys.

Název v anglickém jazyce

High temperature dislocation processes in precipitation hardened crystals investigated by a 3D discrete dislocation dynamics

Popis výsledku anglicky

3D discrete dislocation dynamics is employed to investigate motion of general mixedndislocation segments subjected to high temperature loadings in microstructures withnimpenetrable particles. The implementations of the model first address several benchmarknprocesses including shrinkage of a glissile dislocation loop driven by self-stresses and annannihilation of mutually interacting co-axial prismatic dislocation loops. In particular, wenshow that models of the microstructure with planar and/or translational symmetrynimprove efficiency, speed and stability of the calculations. Our simulations then focus onnmigration of low angle dislocation boundaries in an array of particles while taking intonaccount all mutual dislocation-dislocation interactions and the action of an externallynapplied stress. The results show for the first time that the migration of tilt dislocationnboundaries in crystals with particles can be associated with threshold stresses. Thencalculated thresholds are in a good agreement with experimental threshold stresses thatncharacterize creep behaviour of precipitation hardened alloys.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

International Journal of Plasticity

ISSN

0749-6419

e-ISSN

—

Svazek periodika

97

Číslo periodika v rámci svazku

OCT

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

23

Strana od-do

1-23

Kód UT WoS článku

000409152100001

EID výsledku v databázi Scopus

2-s2.0-85024489178