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(CrVW)(1-x)(TaTi)x, (x=10 and 20 at.%), high entropy alloys as thermal barriers for nuclear fusion reactors

2026-07Artigo científico Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia dos Materiais
datacite.subject.fosEngenharia e Tecnologia::Outras Engenharias e Tecnologias
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorMartins, Ricardo
dc.contributor.authorLara, S. de
dc.contributor.authorNeves, Filipe
dc.contributor.authorSá, Ana
dc.contributor.authorLuz, Paulo P. da
dc.contributor.authorPereira Gonçalves, Antonio
dc.contributor.authorGalatanu, Andrei
dc.contributor.authorSobieraj, Damian
dc.contributor.authorNguyen-Manh, D.
dc.contributor.authorDias, Marta
dc.date.accessioned2026-08-14T15:11:52Z
dc.date.available2026-08-14T15:11:52Z
dc.date.issued2026-07
dc.description.abstractABSTRACT: Due to the extreme operating temperatures in nuclear fusion reactors, current divertor monoblock materials, tungsten (plasma-facing material) and CuCrZr (heat sink), exhibit a substantial mismatch in mechanical and thermal properties. Therefore, a thermal barrier interlayer is required to guarantee continuous operation. In this work, (CrVW)(1-x)(TaTi)x alloys (x = 10 and 20 at.%) were studied for application as interlayers in nuclear fusion reactors. Atomistic modeling using Monte Carlo simulations combined with a first-principles-based Cluster Expansion Hamiltonian has been performed as a function of temperature to predict the order-disorder transitions in the investigated high-entropy alloys. Moreover, the experimental alloys were prepared by mechanical alloying followed by spark plasma sintering. Both alloy compositions display strong negative average chemical shortrange ordering below 1500 K for the W-Ta and W-Ti chemical pairs, with an estimated transition temperature around 1300 K. Atomic structures obtained from Monte Carlo simulations for (CrWV)80(TaTi)20 indicate that the ordering observed in this composition is stronger than that for (CrWV)90(TaTi)10. Moreover, both systems exhibit a bcc structure, and heat treated samples show phase growth and a four phase microstructure. The thermal diffusivity increases with temperature, reaching lower values than those of pure W and CuCrZr.eng
dc.identifier.citationMartins, R., Lara, S. de, Neves, F., Sá, A., Luz, P. , Gonçalves, A.P., Galatanu, A., Sobieraj, D., Nguyen-Manh, D., & Dias, M. (2026). (CrVW)(1-x)(TaTi)x, (x = 10 and 20 at.%), high entropy alloys as thermal barriers for nuclear fusion reactors. In: Journal of Nuclear Materials, 2016, vol. 632, article 156866. https://doi.org/10.1016/j.jnucmat.2026.156866
dc.identifier.doi10.1016/j.jnucmat.2026.156866
dc.identifier.issn0022-3115
dc.identifier.urihttp://hdl.handle.net/10400.9/6419
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationImplementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0022311526004319?pes=vor&utm_source=clarivate&getft_integrator=clarivate
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMaterials
dc.subjectMolecular dynamics simulation
dc.subjectHigh entropy alloys
dc.subjectMonte Carlo simulation
dc.subjectMicrostructure
dc.subjectX-ray diffraction
dc.title(CrVW)(1-x)(TaTi)x, (x=10 and 20 at.%), high entropy alloys as thermal barriers for nuclear fusion reactorseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumber633053
oaire.awardNumberUIDP/50010/2020
oaire.awardTitleImplementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/633053/EU
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50010%2F2020/PT
oaire.citation.titleJournal of Nuclear Materials
oaire.citation.volume632
oaire.fundingStreamH2020
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameMartins
person.familyNameNeves
person.familyNameSá
person.familyNamePereira Gonçalves
person.familyNameGalatanu
person.familyNameSobieraj
person.familyNameDias
person.givenNameRicardo
person.givenNameFilipe
person.givenNameAna
person.givenNameAntonio
person.givenNameAndrei
person.givenNameDamian
person.givenNameMarta
person.identifier.ciencia-id1815-040B-3FEF
person.identifier.ciencia-idB615-CCF2-424E
person.identifier.ciencia-id4D1A-2834-70FA
person.identifier.ciencia-id0E13-5F70-9D8A
person.identifier.orcid0000-0001-7768-5704
person.identifier.orcid0000-0002-1251-053X
person.identifier.orcid0000-0003-1267-7994
person.identifier.orcid0000-0003-2640-3038
person.identifier.orcid0000-0001-8474-8259
person.identifier.orcid0000-0002-3268-3999
person.identifier.orcid0000-0001-6797-7711
person.identifier.ridA-7836-2012
person.identifier.ridB-2849-2008
person.identifier.scopus-author-id7004435348
person.identifier.scopus-author-id7102086109
person.identifier.scopus-author-id35415989000
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameEuropean Commission
project.funder.nameFundação para a Ciência e a Tecnologia
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