Publication detail
Stability of ultrafine-grained structure of copper under fatigue loading
KUNZ, L. LUKÁŠ, P. PANTĚLEJEV, L. MAN, O.
Czech title
Strukturní stabilita ultrajemnozrrné mědi při únavovém zatěžování
English title
Stability of ultrafine-grained structure of copper under fatigue loading
Type
journal article - other
Language
en
Original abstract
Stability of microstructure of ultrafine-grained materials under cyclic loading is a crucial condition for their good fatigue performance. Changes of microstructure due to fatigue in bulk, localization of cyclic plasticity into cyclic slip bands and related development of microstructure were experimentally studied on ultrafine-grained copper prepared by equal channel angular pressing. Different reaction of ultrafine-grained structure to plastic strain-controlled and load-controlled tests was found. The different susceptibility to dynamic grain coarsening under load and plastic strain-controlled tests reported in literature cannot be explained by differences in purity or details of equal channel angular pressing. The localization of the cyclic plasticity and the development of cyclic slip bands resulting in fatigue crack initiation take place in material volumes which can be characterized as -near by oriented- regions. They correspond to the shear bands, which are characteristic for ultrafine-grained structure after equal channel angular pressing.
Czech abstract
Mikrostrukturní stabilita ultrajemnozrnných materiálu při cyklickém zatěžováníje je nezbytnou podmínkou pro jejich únavovou odolnost. V této práci byly zkoumány změny mikrostruktury způsobené únavovým zatěžováním (lokalizace cyklické plasticity do únavových skluzových pásů) a současně sledována relace únavových skluzových pásů a mikrostruktury ultrajemnozrnné Cu u niž byla UFG struktura dosažena pomocí intenzivní plastrické deformace.
English abstract
Stability of microstructure of ultrafine-grained materials under cyclic loading is a crucial condition for their good fatigue performance. Changes of microstructure due to fatigue in bulk, localization of cyclic plasticity into cyclic slip bands and related development of microstructure were experimentally studied on ultrafine-grained copper prepared by equal channel angular pressing. Different reaction of ultrafine-grained structure to plastic strain-controlled and load-controlled tests was found. The different susceptibility to dynamic grain coarsening under load and plastic strain-controlled tests reported in literature cannot be explained by differences in purity or details of equal channel angular pressing. The localization of the cyclic plasticity and the development of cyclic slip bands resulting in fatigue crack initiation take place in material volumes which can be characterized as -near by oriented- regions. They correspond to the shear bands, which are characteristic for ultrafine-grained structure after equal channel angular pressing.
Keywords in Czech
Únava ultrajemnozrnné Cu, mikrostrukturní stabilita, únavové skluzové pásy
Keywords in English
Fatigue of ultrafine-grained Cu, stability of ultrafine-grained structure, cyclic slip bands
RIV year
2011
Released
10.06.2011
Publisher
ELSEVIER
ISSN
1877-7058
Journal
Procedia Engineering
Volume
10
Number
ICM11
Pages from–to
201–206
Pages count
6
BIBTEX
@article{BUT73820,
author="Ludvík {Kunz} and Petr {Lukáš} and Libor {Pantělejev} and Ondřej {Man},
title="Stability of ultrafine-grained structure of copper under fatigue loading",
journal="Procedia Engineering",
year="2011",
volume="10",
number="ICM11",
month="June",
pages="201--206",
publisher="ELSEVIER",
issn="1877-7058"
}