Počet záznamů: 1

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

SYSNO ASEP	0467048
Druh ASEP	C - Konferenční příspěvek (mezinárodní konf.)
Zařazení RIV	D - Článek ve sborníku
Název	A Numerical Analysis of Deformation Processes in Oxide Dispersion-Strengthened Materials – Influence of Dislocation-Particle Interactions
Tvůrce(i)	Záležák, Tomáš (UFM-A)_{RID, ORCID} Šiška, Filip (UFM-A)_{RID, ORCID} Stratil, Luděk (UFM-A)_ORCID Luptáková, Natália (UFM-A)_{RID, ORCID} Šmíd, Miroslav (UFM-A)_{RID, ORCID} Bártková, Denisa (UFM-A) Svoboda, Jiří (UFM-A)_{RID, ORCID} Dlouhý, Antonín (UFM-A)_{RID, ORCID}
Celkový počet autorů	8
Zdroj.dok.	Materials Structure & Micromechanics of Fracture VIII. - Zürrich : Trans Tech Publications, 2017 / Šandera P. - ISSN 1662-9779 - ISBN 978-3-03835-626-4
Rozsah stran	s. 106-109
Poč.str.	4 s.
Forma vydání	Tištěná - P
Akce	MSMF8. International Conference on Materials Structure and Micromechanics of Fracture /8./
Datum konání	27.06.2016 - 29.06.2016
Místo konání	Brno
Země	CZ - Česká republika
Typ akce	WRD
Jazyk dok.	eng - angličtina
Země vyd.	CH - Švýcarsko
Klíč. slova	3D discrete dislocation dynamics ; metal matrix composites ; precipitate hardening ; high temperature creep
Vědní obor RIV	JG - Hutnictví, kovové materiály
Obor OECD	Materials engineering
CEP	GA14-22834S GA ČR - Grantová agentura ČR
	GJ15-21292Y GA ČR - Grantová agentura ČR
Institucionální podpora	UFM-A - RVO:68081723
EID SCOPUS	85009724445
DOI	10.4028/www.scientific.net/SSP.258.106
Anotace	A recently developed 3D discrete dislocation dynamics (DDD) model is employed to study kinetics of dislocation ensembles subjected to high temperature creep in microstructures of metal matrix composites. We particularly focus on a migration of low angle tilt boundaries in a field of rigid impenetrable particles. This type of dislocation boundaries represents a typical microstructural feature mediating plastic deformation during the high temperature loadings. The article compares results of numerical studies that considered distinct dislocation-particle in- teractions in order to describe the response of dislocation structure to the applied stress. The results suggest that, regardless the details related to the dislocation-particle interactions, a critical applied stress always exists, below which the boundary migration process ceases [1, 2]. The existence of crit- ical threshold is confirmed by creep tests of ODS materials. This critical threshold, contrary to the classical Orowan stress, is proportional to the dislocation density. The displacements of individual dislocation segments on the micro-scale level reflect the changes in the dislocation-particle interac- tions quite sensitively. At the macro-scale level, the overall strain rate, which averages out velocities of all the individual dislocation segments, is also significantly influenced by the changes in dislocation- particle interaction.
Pracoviště	Ústav fyziky materiálu
Kontakt	Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
Rok sběru	2018

Počet záznamů: 1