Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP

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dc.contributor.authorFintová, Stanislavacs
dc.contributor.authorKunz, LudvĂ­kcs
dc.coverage.issue8cs
dc.coverage.volume63cs
dc.date.issued2014-08-08cs
dc.description.abstractMechanism of fatigue crack initiation was investigated in ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP). Fatigue behaviour of UFG material was compared to the behaviour of material in an initial as-cast state. Focused ion beam technique (FIB) was applied to reveal the surface relief and early fatigue cracks. Two substantially different mechanisms of crack initiation were observed in UFG structure, which can be characterized as bimodal even after 6 ECAP passes by route Bc. The bimodality consists in a coexistence of very fine grained areas with higher content of Mg17Al12 particles and areas exhibiting somewhat larger grains and lower density of particles. The fatigue cracks which initiate in areas of larger grains are related to the cyclic slip bands; this initiation mechanism is similar to that observed in cast alloy. The second initiation mechanism is related to the grain boundary cracking which takes place predominantly in the fine grained areas.en
dc.description.abstractMechanism of fatigue crack initiation was investigated in ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP). Fatigue behaviour of UFG material was compared to the behaviour of material in an initial as-cast state. Focused ion beam technique (FIB) was applied to reveal the surface relief and early fatigue cracks. Two substantially different mechanisms of crack initiation were observed in UFG structure, which can be characterized as bimodal even after 6 ECAP passes by route Bc. The bimodality consists in a coexistence of very fine grained areas with higher content of Mg17Al12 particles and areas exhibiting somewhat larger grains and lower density of particles. The fatigue cracks which initiate in areas of larger grains are related to the cyclic slip bands; this initiation mechanism is similar to that observed in cast alloy. The second initiation mechanism is related to the grain boundary cracking which takes place predominantly in the fine grained areas.en
dc.formattextcs
dc.format.extent1-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationIOP Conference Series: Materials Science and Engineering. 2014, vol. 63, issue 8, p. 1-8.en
dc.identifier.doi10.1088/1757-899X/63/1/012159cs
dc.identifier.isbn978-1-63439-874-9cs
dc.identifier.issn1757-8981cs
dc.identifier.orcid0000-0002-2460-2933cs
dc.identifier.other110649cs
dc.identifier.researcheridD-8198-2018cs
dc.identifier.scopus37072139700cs
dc.identifier.urihttp://hdl.handle.net/11012/137197
dc.language.isoencs
dc.publisherIOP Publishingcs
dc.relation.ispartofIOP Conference Series: Materials Science and Engineeringcs
dc.relation.urihttp://iopscience.iop.org/article/10.1088/1757-899X/63/1/012159cs
dc.rightsCreative Commons Attribution 3.0 Unportedcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1757-8981/cs
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/cs
dc.subjectfatigue crack initiationen
dc.subjectfatigueen
dc.subjectAZ91 magnesium alloyen
dc.subjectfatigue crack initiation
dc.subjectfatigue
dc.subjectAZ91 magnesium alloy
dc.titleInitiation of fatigue cracks in AZ91 Mg alloy processed by ECAPen
dc.title.alternativeInitiation of fatigue cracks in AZ91 Mg alloy processed by ECAPen
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-110649en
sync.item.dbtypeVAVen
sync.item.insts2025.10.14 15:18:54en
sync.item.modts2025.10.14 10:18:34en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Pokročilé kovové materiály a kompozity na bázi kovůcs
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