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Mechanical activation of pre-alloyed NiTi2 and elemental Ni for the synthesis of NiTi alloys

2018Journal article Open access
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dc.contributor.authorZhao, X.
dc.contributor.authorNeves, Filipe
dc.contributor.authorCorreia, J.B.
dc.contributor.authorLiu, K.
dc.contributor.authorFernandes, F. M. Braz
dc.contributor.authorKoledov, V.
dc.contributor.authorvon Gratowski, S.
dc.contributor.authorXu, S.
dc.contributor.authorHuang, J.
dc.date.accessioned2018-10-11T15:47:25Z
dc.date.available2018-10-11T15:47:25Z
dc.date.issued2018
dc.description.abstractABSTRACT: This work reports on an efficient powder metallurgy method for the synthesis of NiTi alloys, involving mechanical activation of pre-alloyed NiTi2 and elemental Ni powders (NiTi2-Ni) followed by a press-and-sinter step. The idea is to take advantage of the brittle nature of NiTi2 to promote a better efficiency of the mechanical activation process. The conventional mechanical activation route using elemental Ti and Ni powders (Ti-Ni) was also used for comparative purposes. Starting with (NiTi2-Ni) powder mixtures resulted in the formation of a predominant amorphous structure after mechanical activation at 300 rpm for 2 h. A sintered specimen consisting mainly of NiTi phase was obtained after vacuum sintering at 1050 degrees C for 0.5 h. The produced NiTi phase exhibited the martensitic transformation behavior. Using elemental Ti powders instead of pre-alloyed NiTi2 powders, the structural homogenization of the synthesized NiTi alloys was delayed. Performing the mechanical activation at 300 rpm for the (Ti-Ni) powder mixtures gave rise to the formation of composite particles consisting in dense areas of alternate fine layers of Ni and Ti. However, no significant structural modification was observed even after 16 h of mechanical activation. Only after vacuum sintering at 1050 degrees C for 6 h, the NiTi phase was observed to be the predominant phase. The higher reactivity of the mechanically activated (NiTi2-Ni) powder particles can explain the different sintering behavior of those powders compared with the mechanically activated (Ti-Ni) powders. It is demonstrated that this innovative approach allows an effective time reduction in the mechanical activation and of the vacuum sintering step.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationZhao, X.; Neves, F.; Correia, J.B...[et.al.]. - Mechanical activation of pre-alloyed NiTi2 and elemental Ni for the synthesis of NiTi alloys. In: Journal of Materials Science, 2018, Vol. 53 (19), p. 13432-13441pt_PT
dc.identifier.issn0022-2461
dc.identifier.urihttp://hdl.handle.net/10400.9/3078
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Verlagpt_PT
dc.relationFundamental Research Funds for the Central Universities, China [FRF-IC-15-005]pt_PT
dc.relationCENIMAT/i3N by FEDER funds through the COMPETE 2020 Programmept_PT
dc.relationRSF Project No 17-19-01748pt_PT
dc.relationFP7-PEOPLE-2013-IRSESpt_PT
dc.relation.publisherversionhttps://doi.org/10.1007/s10853-018-2560-5pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectNi-Ti alloyspt_PT
dc.subjectPowder metallurgypt_PT
dc.subjectMechanical alloyingpt_PT
dc.subjectNickelpt_PT
dc.subjectTitaniumpt_PT
dc.titleMechanical activation of pre-alloyed NiTi2 and elemental Ni for the synthesis of NiTi alloyspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FCTM%2F50025%2F2013/PT
oaire.citation.endPage13441pt_PT
oaire.citation.startPage13432pt_PT
oaire.citation.titleJournal of Materials Sciencept_PT
oaire.citation.volume53pt_PT
oaire.fundingStream5876
person.familyNameNeves
person.familyNameCorreia
person.givenNameFilipe
person.givenNameJose B.
person.identifier.ciencia-id1815-040B-3FEF
person.identifier.ciencia-idC31C-D617-6377
person.identifier.orcid0000-0002-1251-053X
person.identifier.orcid0000-0002-8314-0695
person.identifier.ridA-7836-2012
person.identifier.scopus-author-id7004435348
person.identifier.scopus-author-id7202364148
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationf4acdd52-3d78-4ef4-991c-9312cd8c78cb
relation.isAuthorOfPublication51557bd3-14c6-4246-b185-36f668c061dd
relation.isAuthorOfPublication.latestForDiscovery51557bd3-14c6-4246-b185-36f668c061dd
relation.isProjectOfPublicatione6685a6a-1da7-487e-84e4-6a6be516ad1e
relation.isProjectOfPublication.latestForDiscoverye6685a6a-1da7-487e-84e4-6a6be516ad1e

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