Effects of precipitates and dislocation loops on the yield stress of irradiated iron

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorLehtinen, Arttuen_US
dc.contributor.authorLaurson, Lasseen_US
dc.contributor.authorGranberg, Fredricen_US
dc.contributor.authorNordlund, Kaien_US
dc.contributor.authorAlava, Mikko J.en_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorComplex Systems and Materialsen
dc.contributor.organizationUniversity of Helsinkien_US
dc.date.accessioned2018-05-22T14:53:00Z
dc.date.available2018-05-22T14:53:00Z
dc.date.issued2018-12-01en_US
dc.description.abstractPlastic deformation of crystalline materials is governed by the features of stress-driven motion of dislocations. In the case of irradiated steels subject to applied stresses, small dislocation loops as well as precipitates are known to interfere with the dislocation motion, leading to an increased yield stress as compared to pure crystals. We study the combined effect of precipitates and interstitial glissile 1/2(111)dislocation loops on the yield stress of iron, using large-scale three-dimensional discrete dislocation dynamics simulations. Precipitates are included in the simulations using our recent multi-scale implementation [A. Lehtinen et al., Phys. Rev. E 93 (2016) 013309], where the strengths and pinning mechanisms of the precipitates are determined from molecular dynamics simulations. In the simulations we observe dislocations overcoming precipitates with an atypical Orowan mechanism which results from pencil-glide of screw segments in iron. Even if the interaction mechanisms with dislocations are quite different, our results suggest that in relative terms, precipitates and loops of similar sizes contribute equally to the yield stress in multi-slip conditions.en
dc.description.versionPeer revieweden
dc.format.extent1-12
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLehtinen, A, Laurson, L, Granberg, F, Nordlund, K & Alava, M J 2018, ' Effects of precipitates and dislocation loops on the yield stress of irradiated iron ', Scientific Reports, vol. 8, no. 1, 6914, pp. 1-12 . https://doi.org/10.1038/s41598-018-25285-zen
dc.identifier.doi10.1038/s41598-018-25285-zen_US
dc.identifier.issn2045-2322
dc.identifier.otherPURE UUID: f32f0c7a-c1ef-407e-88c7-53dc758108f3en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/f32f0c7a-c1ef-407e-88c7-53dc758108f3en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85046434318&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/21134024/s41598_018_25285_z.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/31267
dc.identifier.urnURN:NBN:fi:aalto-201805222707
dc.language.isoenen
dc.relation.ispartofseriesScientific Reportsen
dc.relation.ispartofseriesVolume 8, issue 1en
dc.rightsopenAccessen
dc.titleEffects of precipitates and dislocation loops on the yield stress of irradiated ironen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion

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