Mechanism of Stress Relaxation and Phase Transformation in Additively Manufactured Ti-6Al-4V via in situ High Temperature XRD and TEM Analyses

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dc.contributor.authorRossi Kaschel, Frederico-
dc.contributor.authorVijayaraghavan, R. K.-
dc.contributor.authorShmeliov, A.-
dc.contributor.authorDowling, Denis P.-
dc.contributor.authorCelikin, Mert-
dc.contributor.authoret al.-
dc.date.accessioned2021-02-15T16:45:19Z-
dc.date.available2021-02-15T16:45:19Z-
dc.date.copyright2020 Acta Materialiaen_US
dc.date.issued2020-04-15-
dc.identifier.citationActa Materialiaen_US
dc.identifier.urihttp://hdl.handle.net/10197/11945-
dc.description.abstractAdditive manufacturing is being increasingly used in the fabrication of Ti-6Al-4V parts to combine excellentmechanical properties and biocompatibility with high precision. Unfortunately, due to the build-up of ther-mal residual stresses and the formation of martensitic structure across a wide range of typical processingconditions, it is generally necessary to use a post-thermal treatment to achieve superior mechanical perfor-mance. This investigation aims to obtain a deeper understanding of the micro/nanostructural evolution(a0martensite phase decomposition), accounting for the kinetics of phase transformation during the heattreatment of 3D-printed Ti-6Al-4V alloy. As the mechanism of phase transformation and stress relaxation isstill ambiguous, in this study the changes in crystal lattice, phase, composition and lattice strain were investi-gated up to 1000°C using bothin situhigh temperature X-ray diffraction (XRD) and transmission electronmicroscopy (TEM). Based on the result a mechanism of phase transformation is proposed, via the accommo-dation/substitution of Al, V and Ti atoms in the crystal lattice. The proposed mechanism is supported basedon elemental concentration changes during heat treatment, in combination with changes in crystal structureobserved using the high temperature XRD and TEM measurements. This study provides a deeper under-standing on the mechanism of phase transformation through martensitic decomposition, as well as a deeperunderstanding of the influence of post-thermal treatment conditions on the alloy’s crystal structure.en_US
dc.description.sponsorshipEuropean Research Councilen_US
dc.description.sponsorshipScience Foundation Irelanden_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rightsThis is the author’s version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Materialia (188, pp. 720-732. (2020)) https://doi.org/10.1016/j.actamat.2020.02.056en_US
dc.subjectAdditive manufacturingen_US
dc.subjectTi-AI-4Ven_US
dc.subjectIn situen_US
dc.subjectHigh temperature transmission electron microscopyen_US
dc.subjectHigh temperature X-ray diffractionen_US
dc.subjectPhase transformationen_US
dc.subjectStress relaxationen_US
dc.titleMechanism of Stress Relaxation and Phase Transformation in Additively Manufactured Ti-6Al-4V via in situ High Temperature XRD and TEM Analysesen_US
dc.typeJournal Articleen_US
dc.statusPeer revieweden_US
dc.identifier.volume188en_US
dc.identifier.startpage720en_US
dc.identifier.endpage732en_US
dc.identifier.doihttps://doi.org/10.1016/j.actamat.2020.02.056-
dc.neeo.contributorRossi Kaschel|Frederico|aut|-
dc.neeo.contributorVijayaraghavan|R. K.|aut|-
dc.neeo.contributorShmeliov|A.|aut|-
dc.neeo.contributorDowling|Denis P.|aut|-
dc.neeo.contributorCelikin|Mert|aut|-
dc.neeo.contributoret al.||aut|-
dc.date.embargo2022-02-23en_US
dc.identifier.grantid16/RC/3872-
dc.identifier.grantidCoG 3D2D Print-
dc.rights.licensehttps://creativecommons.org/licenses/by-nc-nd/3.0/ie/en_US
item.fulltextWith Fulltext-
item.grantfulltextopen-
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