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

SYSNO ASEP	0467048
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	A Numerical Analysis of Deformation Processes in Oxide Dispersion-Strengthened Materials – Influence of Dislocation-Particle Interactions
Author(s)	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}
Number of authors	8
Source Title	Materials Structure & Micromechanics of Fracture VIII. - Zürrich : Trans Tech Publications, 2017 / Šandera P. - ISSN 1662-9779 - ISBN 978-3-03835-626-4
Pages	s. 106-109
Number of pages	4 s.
Publication form	Print - P
Action	MSMF8. International Conference on Materials Structure and Micromechanics of Fracture /8./
Event date	27.06.2016 - 29.06.2016
VEvent location	Brno
Country	CZ - Czech Republic
Event type	WRD
Language	eng - English
Country	CH - Switzerland
Keywords	3D discrete dislocation dynamics ; metal matrix composites ; precipitate hardening ; high temperature creep
Subject RIV	JG - Metallurgy
OECD category	Materials engineering
R&D Projects	GA14-22834S GA ČR - Czech Science Foundation (CSF)
	GJ15-21292Y GA ČR - Czech Science Foundation (CSF)
Institutional support	UFM-A - RVO:68081723
EID SCOPUS	85009724445
DOI	10.4028/www.scientific.net/SSP.258.106
Annotation	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.
Workplace	Institute of Physics of Materials
Contact	Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
Year of Publishing	2018

Number of the records: 1