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Dissimilar fusion welding of NiTi shape memory alloy and AlCoCrFeNi2.1 eutectic high entropy alloy using multi-interlayer strategy

2026-05Artigo científico Acesso aberto
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dc.contributor.authorArthur, Nithin Joseph Reddy Sagili
dc.contributor.authorKim, Rae Eon
dc.contributor.authorMartins, Ana
dc.contributor.authorKim, Hyoung Seop
dc.contributor.authorSchell, N.
dc.contributor.authorOliveira, João Pedro
dc.contributor.institutionCENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)
dc.contributor.institutionDCM - Departamento de Ciência dos Materiais
dc.contributor.pblElsevier Science B.V., Amsterdam.
dc.date.accessioned2026-05-21T10:32:02Z
dc.date.available2026-05-21T10:32:02Z
dc.date.issued2026-05
dc.descriptionPublisher Copyright: © 2026 The Author(s)
dc.description.abstractDissimilar fusion welding between NiTi shape memory alloy and AlCoCrFeNi2.1, eutectic high entropy alloy was achieved using a combination of Nb and Cu interlayers. Both base metals exhibit unique properties that complement each other making them attractive for integration in smart systems. However, direct joining of these materials is not feasible due to the formation of brittle intermetallic compounds that compromise the joint integrity. Thus, to avoid this metallurgical issue dissolution of the Nb and Cu interlayers promoted elemental intermixing and altered solidification pathways, leading to the formation and intensification of topologically close-packed phases. Phase evolution was assessed through thermodynamic CALPHAD simulations and validated using synchrotron X-ray diffraction, while further microstructural characterization employed backscattered electron imaging and energy dispersive spectroscopy. The weld exhibited pronounced spatial heterogeneity, with a peak hardness of 856 HV0.3 near the NiTi-side interfacial region, consistent with enrichment of TCP phases and Ti-rich intermetallics. Tensile testing showed fracture at an ultimate tensile strength of 372 MPa and a fracture strain of 1.11%, with crack initiation in the hardened interfacial region followed by mixed-mode fracture toward the fusion zone. Although tensile ductility remains limited, the multi-interlayer strategy enabled defect-free joint formation and confined embrittlement to a narrow region compared with direct joining.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent14
dc.format.extent11624222
dc.identifier.doi10.1016/j.matchar.2026.116267
dc.identifier.issn1044-5803
dc.identifier.otherPURE: 162749059
dc.identifier.otherPURE UUID: 73ef51d9-5e77-45b6-8648-d019f3f89942
dc.identifier.otherScopus: 105032877561
dc.identifier.otherWOS: 001719557800001
dc.identifier.otherORCID: /0000-0001-6906-1870/work/215416265
dc.identifier.urihttp://hdl.handle.net/10362/203263
dc.identifier.urlhttps://www.scopus.com/pages/publications/105032877561
dc.identifier.urlhttps://www.webofscience.com/wos/woscc/full-record/WOS:001719557800001
dc.language.isoeng
dc.peerreviewedyes
dc.subjectAlCoCrFeNi eutectic high entropy alloy
dc.subjectDissimilar fusion welding
dc.subjectMechanical characterization
dc.subjectMulti-interlayer diffusion barrier
dc.subjectNiTi shape memory alloy
dc.subjectSynchrotron X-ray diffraction
dc.subjectThermodynamic simulation
dc.subjectGeneral Materials Science
dc.subjectCondensed Matter Physics
dc.subjectMechanics of Materials
dc.subjectMechanical Engineering
dc.titleDissimilar fusion welding of NiTi shape memory alloy and AlCoCrFeNi2.1 eutectic high entropy alloy using multi-interlayer strategyen
dc.typejournal article
degois.publication.firstPage1
degois.publication.lastPage14
degois.publication.titleMaterials Characterization
degois.publication.volume235
dspace.entity.typePublication
rcaap.rightsopenAccess

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