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Searching new solutions for NiTi sensors through indirect additive manufacturing

2022Journal article Open access
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dc.contributor.authorCarreira, Pedro
dc.contributor.authorGatões, Daniel
dc.contributor.authorAlves, Nuno
dc.contributor.authorRamos, Ana Sofia
dc.contributor.authorVieira, Maria Teresa
dc.date.accessioned2023-02-23T15:27:03Z
dc.date.available2023-02-23T15:27:03Z
dc.date.issued2022
dc.description.abstractShape Memory Alloys (SMAs) can play an essential role in developing novel active sensors for self-healing, including aeronautical systems. However, the NiTi SMAs available in the market are almost limited to wires, small sheets, and coatings. This restriction is mainly due to the difficulty in processing NiTi through conventional processes. Thus, the objective of this study is to evaluate the potential of one of the most promising routes for NiTi additive manufacturing—material extrusion (MEX). Optimizing the different steps during processing is mandatory to avoid brittle secondary phases formation, such as Ni3Ti. The prime NiTi powder is prealloyed, but it also contains NiTi2 and Ni as secondary phases. The present study highlights the role of Ni and NiTi2, with the later having a melting temperature (Tm = 984 ºC) lower than the NiTi sintering temperature, thus allowing a welcome liquid phase sintering (LPS). Nevertheless, the reaction of the liquid phase with the Ni phase could contribute to the formation of brittle intermetallic compounds, particularly around NiTi and NiTi2 phases, affecting the final structural properties of the 3D object. The addition of TiH2 to the virgin prealloyed NiTi powder was also studied and revealed the non-formation of Ni3Ti for a specific composition. The balancing addition of extra Ni revealed priority in the Ni3Ti appearance, emphasizing the role of Ni. Feedstocks extruded (filaments) and green strands (layers), before and after debinding & sintering, were used as homothetic of 3D objects for evaluation of defects (microtomography), microstructures, and mechanical properties. The composition of prealloyed powder with 5 wt.% TiH2 addition after sintering showed a homogeneous matrix with the NiTi2 second phase uniformly dispersed.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCarreira, P.; Gatões, D.; Alves, N.; Ramos, A.S.; Vieira, M.T. Searching New Solutions for NiTi Sensors through Indirect Additive Manufacturing. Materials 2022, 15, 5007. https://doi.org/10.3390/ ma15145007pt_PT
dc.identifier.doi10.3390/ma15145007pt_PT
dc.identifier.issn1996-1944
dc.identifier.urihttp://hdl.handle.net/10400.8/8158
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationPOCI-01-0145-FEDER-029101pt_PT
dc.relationTowards self-repairing metallic materials
dc.relationCentre for Rapid and Sustainable Product Development
dc.relation.publisherversionhttps://www.mdpi.com/1996-1944/15/14/5007pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectNickel-Titanium (NiTi)pt_PT
dc.subjectShape Memory Alloys (SMAs)pt_PT
dc.subjectMetal Extrusion (MEX)pt_PT
dc.subjectAdditive manufacturing (AM)pt_PT
dc.subjectTitanium Hydride (TiH2)pt_PT
dc.titleSearching new solutions for NiTi sensors through indirect additive manufacturingpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTowards self-repairing metallic materials
oaire.awardTitleCentre for Rapid and Sustainable Product Development
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FCTM-CTM%2F29101%2F2017/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04044%2F2020/PT
oaire.citation.issue14pt_PT
oaire.citation.titleMaterialspt_PT
oaire.citation.volume15pt_PT
oaire.fundingStream9471 - RIDTI
oaire.fundingStream6817 - DCRRNI ID
person.familyNameJosé da Silva Carreira
person.familyNameGatões
person.familyNameAlves
person.familyNameFigueira Ramos
person.familyNameVieira
person.givenNamePedro
person.givenNameDaniel
person.givenNameNuno
person.givenNameAna Sofia
person.givenNameMaria Teresa
person.identifier452149
person.identifierK-8450-2012
person.identifier.ciencia-idA211-6A27-5B05
person.identifier.ciencia-idA31F-71C8-6610
person.identifier.ciencia-id311E-1559-8F6C
person.identifier.ciencia-idBB12-8051-02F2
person.identifier.ciencia-idC21D-0159-C137
person.identifier.orcid0000-0002-4698-3650
person.identifier.orcid0000-0001-8078-6530
person.identifier.orcid0000-0002-5016-0868
person.identifier.orcid0000-0002-8486-5436
person.identifier.orcid0000-0001-9981-3826
person.identifier.ridN-4073-2013
person.identifier.scopus-author-id55749707600
person.identifier.scopus-author-id7006403383
person.identifier.scopus-author-id7401770170
person.identifier.scopus-author-id7202140751
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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