Two-Phase Dendrite and Bimodal Structure in an Al-Cu-Ni Alloy: Their Roles in Hardness

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dc.contributor.authorRodrigues, Adilson V.
dc.contributor.authorKakitani, Rafael
dc.contributor.authorOliveira, Ricardo
dc.contributor.authorBarros, André
dc.contributor.authorBrito, Crystopher [UNESP]
dc.contributor.authorGarcia, Amauri
dc.contributor.authorCheung, Noé
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionIFSP
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-28T19:50:06Z
dc.date.available2022-04-28T19:50:06Z
dc.date.issued2022-01-01
dc.description.abstractWith the increasing interest in developing Al-Cu-Ni alloys for use as structural material comes the need to understand more about their processing–microstructure–properties relationships. In this work, an unsteady-state directional solidification technique was used to investigate the influence of growth (v) and cooling (T˙) rates on the microstructure evolution of an Al-15Cu-5Ni alloy (wt.%) and analyze the consequent effects on hardness. The results reveal two-phase dendrites with a trefoil morphology in which the angle between the dendritic arms is around 120°. In addition, the interdendritic regions are shown to be composed of a bimodal structure including irregular block-type (Al7Cu4Ni) and lamellar-type (α-Al + Al2Cu) IMCs. A mechanism is proposed to describe the microstructure formation and evolution as well as experimental equations to represent the growth of dendritic arm spacings in terms of v and T˙. Finally, it is discussed why Al7Cu4Ni and Al2Cu IMCs are shown to have more impact on hardness of the studied alloy than the length scale of two-phase dendrites.en
dc.description.affiliationDepartment of Manufacturing and Materials Engineering University of Campinas UNICAMP, SP
dc.description.affiliationFederal Institute of Education Science and Technology of São Paulo IFSP, SP
dc.description.affiliationSão Paulo State University UNESP Campus of São João da Boa Vista, SP
dc.description.affiliationUnespSão Paulo State University UNESP Campus of São João da Boa Vista, SP
dc.identifierhttp://dx.doi.org/10.1007/s11665-021-06525-2
dc.identifier.citationJournal of Materials Engineering and Performance.
dc.identifier.doi10.1007/s11665-021-06525-2
dc.identifier.issn1544-1024
dc.identifier.issn1059-9495
dc.identifier.scopus2-s2.0-85123570183
dc.identifier.urihttp://hdl.handle.net/11449/223344
dc.language.isoeng
dc.relation.ispartofJournal of Materials Engineering and Performance
dc.sourceScopus
dc.subjectAl-Cu-Ni alloys
dc.subjecthardness
dc.subjectmicrostructure
dc.subjectsolidification
dc.titleTwo-Phase Dendrite and Bimodal Structure in an Al-Cu-Ni Alloy: Their Roles in Hardnessen
dc.typeArtigo

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