Additive manufacturing of a functionally graded high entropy alloy using a hybrid powder-bed wire-based direct energy deposition approach

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dc.contributor.authorLu, Yao
dc.contributor.authorWang, Jun
dc.contributor.authorWilliams, Stewart
dc.contributor.authorZhu, Lisong
dc.contributor.authorDing, Jialuo
dc.contributor.authorDiao, Chenglei
dc.contributor.authorJiang, Zhengyi
dc.date.accessioned2023-02-09T10:33:51Z
dc.date.available2023-02-09T10:33:51Z
dc.date.issued2023-01-23
dc.description.abstractA functionally graded AlxCoCrFeNi high entropy alloy with a variation in Al concentration along the building direction was in-situ produced using a hybrid powder-bed wire-based direct energy deposition process. A continuous transition from a single FCC structure to a major BCC+minor FCC dual-phase structure was achieved, benefiting from the remelting and reheating process during the deposition. In the FCC→BCC transition zone, the dendritic core region is identified as an FCC matrix decorated by AlNi-rich ordered B2 precipitates. The interdendritic area shows B2 precipitating in the FeCr-rich disordered A2 matrix. Additionally, the interface between the two regions shows that the A2 phase and ordered Cr3Fe intermetallic phase precipitate at the B2 phase. The mechanical properties show a tendency for higher strength and hardening rate but lower plasticity corresponding to the areas with higher Al content. Through quantitative estimation of different strengthening mechanisms, the contribution from precipitation strengthening became increasingly apparent as Al content increased. Other strengthening modes, including solid solution and dislocations, also contribute to the total strength. This investigation realises a novel additive manufacturing method combining powder bed and wire feeding, which can produce a more convenient and cost-effective gradient material with a complex composition.en_UK
dc.description.sponsorshipEngineering and Physical Sciences Research Council (EPSRC): EP/R027218/1en_UK
dc.identifier.citationLu Y, Wang J, Williams S, et al., (2023) Additive manufacturing of a functionally graded high entropy alloy using a hybrid powder-bed wire-based direct energy deposition approach, Additive Manufacturing, Volume 63, February 2023, Article number 103424en_UK
dc.identifier.eissn2214-8604
dc.identifier.issn2214-7810
dc.identifier.urihttps://doi.org/10.1016/j.addma.2023.103424
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19160
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectHybrid direct energy depositionen_UK
dc.subjectFunctionally graded materialen_UK
dc.subjectHigh entropy alloyen_UK
dc.subjectMicrostructure evolutionen_UK
dc.subjectMechanical propertiesen_UK
dc.titleAdditive manufacturing of a functionally graded high entropy alloy using a hybrid powder-bed wire-based direct energy deposition approachen_UK
dc.typeArticleen_UK

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