Micropore evolution in additively manufactured aluminum alloys under heat treatment and inter-layer rolling

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dc.contributor.authorGu, Jianglong
dc.contributor.authorYang, Shouliang
dc.contributor.authorGao, Minjie
dc.contributor.authorBai, Jing
dc.contributor.authorZhai, Yuchun
dc.contributor.authorDing, Jialuo
dc.date.accessioned2020-02-03T16:08:08Z
dc.date.available2020-02-03T16:08:08Z
dc.date.issued2019-10-28
dc.description.abstractThe application of wire + arc additively manufactured (WAAM) aluminum alloys has been restricted by the porosity defect, which is generally detrimental to the mechanical properties. Suppressing of micropores in the WAAM components has attracted considerable attention in recent years. Inter-layer rolling was introduced to eliminate micropores during the WAAM deposition of the Al–Cu6.3 and Al–Mg4.5 alloys. The distribution characteristics and individual morphology of micropores were revealed by the X-ray diffraction tomography. Key findings demonstrated that the number, volume, size, and roundness of micropores in rolled alloys decreased similarly with increasing loads, eventually achieving a density of over 99.9%. After the heat treatment, the homogeneous distribution of fine (around 5.3 μm) and spherical (0.70–0.74) micropores was realized in the 45 kN rolled alloys. All the evaluated indicators of micropores in the 45 kN rolled + heat treated alloys were superior to the post-deposition heat treated state. The evolution mechanisms include the reprecipitation of hydrogen pores, formation of vacant voids, and re-opening of unclosed pores. The hybrid technique of WAAM + rolling + heat treatment has great potential in promoting mechanical properties of WAAM alloys. The results will provide a theoretical guidance for the design of high-performance WAAM aluminum alloy components.en_UK
dc.identifier.citationGu J, Yang S, Gao M, (2019) et al.,Micropore evolution in additively manufactured aluminum alloys under heat treatment and inter-layer rolling. Materials and Design, Volume 186, January 2019, Article number 108288en_UK
dc.identifier.issn0264-1275
dc.identifier.urihttps://doi.org/10.1016/j.matdes.2019.108288
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15081
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectDirected energy depositionen_UK
dc.subjectWire + arc additive manufactureen_UK
dc.subjectX-ray computed tomographyen_UK
dc.subjectAluminum alloyen_UK
dc.subjectMicroporesen_UK
dc.titleMicropore evolution in additively manufactured aluminum alloys under heat treatment and inter-layer rollingen_UK
dc.typeArticleen_UK

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