Grain refinement and mechanical properties improvement of additively manufactured Al-Cu alloy through pre-deformation in thermo-mechanical treatment

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dc.contributor.authorZhang, Tao
dc.contributor.authorChen, Junwen
dc.contributor.authorGong, Hai
dc.contributor.authorWu, Yunxin
dc.contributor.authorChen, Xin
dc.date.accessioned2024-10-21T11:00:39Z
dc.date.available2024-10-21T11:00:39Z
dc.date.freetoread2025-10-14
dc.date.issued2024-11
dc.date.pubOnline2024-10-13
dc.description.abstractInferior mechanical properties induced by porosity and coarse grains of wire-arc additively manufactured Al-Cu alloy restrict its industrial application. The inter-layer cold rolling, conventional heat treatment (T6) and thermo-mechanical heat treatment (T8) was applied to Al-Cu alloy, and the effect of pre-stretched strain in T8 treatment was investigated. The pre-stretched strain induces equal increments of hardness and YS for both the as-deposited and cold-rolled conditions before aging treatment, while the increments for cold-rolled samples are larger after aging treatment. The cold-rolled sample shows better tensile properties than the as-deposited sample with the same pre-stretched strain in T8 treatment, proving that T8 treatment further increased the strengths compared to the T6 treatment. It shows the best tensile properties with the pre-stretched strain of 5 %, exceeding the properties of 2219-T87 plate. With the increased pre-stretched strain, the density of the θ′ phases significantly increases; while further increase to 10 % pre-stretched strain induces severe coarsening of θ′ phases. Therefore, an optimized pre-stretched strain leads to high-density and tiny dispersed θ′ phases, thus resulting in the best tensile properties. Grain refinement induced by inter-layer cold rolling and uniformly precipitated phases resulted from proper pre-stretched strain both contribute to the strengths enhancement. The strengthening mechanism of hybrid additive manufacturing and inter-layer cold rolling followed by T8 treatment was discussed.
dc.description.journalNameMaterials Science and Engineering: A
dc.description.sponsorshipThe authors wish to acknowledge the financial support from the State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University (ZZYJKT2024-08), Natural Science Foundation of Changsha (kq2402213), and China Scholarship Council (201806835007).
dc.identifier.citationZhang T, Chen J, Gong H, et al., (2024) Grain refinement and mechanical properties improvement of additively manufactured Al-Cu alloy through pre-deformation in thermo-mechanical treatment. Materials Science and Engineering: A, Volume 916, November 2024, Article number 147371
dc.identifier.elementsID555170
dc.identifier.issn0921-5093
dc.identifier.paperNo147371
dc.identifier.urihttps://doi.org/10.1016/j.msea.2024.147371
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23099
dc.identifier.volumeNo916
dc.languageEnglish
dc.language.isoen
dc.publisherElsevier
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0921509324013029?via%3Dihub
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject40 Engineering
dc.subject4016 Materials Engineering
dc.subjectMaterials
dc.subject4016 Materials engineering
dc.subject4017 Mechanical engineering
dc.subjectWire-arc additive manufacture
dc.subjectInter-layer cold rolling
dc.subjectPre-stretched strain
dc.subjectGrain refinement
dc.subjectTensile properties
dc.subjectStrengthening mechanism
dc.titleGrain refinement and mechanical properties improvement of additively manufactured Al-Cu alloy through pre-deformation in thermo-mechanical treatment
dc.typeArticle
dcterms.dateAccepted2024-10-07

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