Influence of displacement constraints to the surface reconstruction of stressed bicrystal thin films

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dc.authoridakyildiz, oncu / 0000-0002-0081-1642
dc.contributor.authorAkyildiz, Oncu
dc.date.accessioned2021-11-01T15:03:08Z
dc.date.available2021-11-01T15:03:08Z
dc.date.issued2020
dc.department[Belirlenecek]
dc.description.abstractIn this work, surface morphology evolution of bicrystal thin films under the combined action of grain boundary and surface diffusion is investigated by considering different mechanical constraints. 2D surface topographies of thin films, that are (a) freestanding, (b) strongly bonded to its substrate and (c) strongly bonded to its substrate and one of sidewalls, are simulated using a numerical implementation of an irreversible thermo-kinetics model. Relationships which give the groove depth as a function of time are obtained. Results show that mechanical loading conditions are effective in determining the morphology and kinetics of grooving. For the three scenarios that had been investigated, it was found that the groove depth evolves linearly with different tip velocities under the same level of uniaxial tension. In freestanding films groove tip evolves faster; i.e. as the film gets constrained from its substrate and/or one of its sidewalls, the tip velocity slows down. It was also observed that high triple junction mobilities at low levels of applied stress hinder the effects of displacement constraints to groove shape, even in the case of asymmetric stress distributions inside the film. On the other hand, low triple junction mobilities at moderate applied stresses allow formation of asymmetric grain boundary grooves due to the induced asymmetry in the driving force for surface diffusion with respect to the grain boundary.
dc.description.sponsorshipTurkish Scientific and Technical Research Council, TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [114M522]en_US
dc.description.sponsorshipThe author dedeicates this article to Professor Tarik O Ogurtani of Middle East Technical University who guides him in learning many facets of chemical thermodynamics, kinetics and mechanics of the surfaces and interfaces. This work was partially supported by the Turkish Scientific and Technical Research Council, TUBITAK through a research Grant No:114M522.en_US
dc.identifier.doi10.1088/2053-1591/ab721b
dc.identifier.issn2053-1591
dc.identifier.issue2en_US
dc.identifier.scopus2-s2.0-85081963717
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1088/2053-1591/ab721b
dc.identifier.urihttps://hdl.handle.net/11491/6988
dc.identifier.volume7en_US
dc.identifier.wosWOS:000535223100001
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[Belirlenecek]
dc.language.isoen
dc.publisherIop Publishing Ltd
dc.relation.ispartofMaterials Research Express
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectthin filmsen_US
dc.subjectsurface diffusionen_US
dc.subjectgrain boundary diffusionen_US
dc.subjectindirect boundary element methoden_US
dc.titleInfluence of displacement constraints to the surface reconstruction of stressed bicrystal thin films
dc.typeArticle

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