Microstructure characterization of a directionally solidified Mg-12wt.%Zn alloy: Equiaxed dendrites, eutectic mixture and type/morphology of intermetallics

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dc.citation.volume204
dc.contributor.authorVerissimo, Nathalia Carolina
dc.contributor.authorBrito, Crystopher Cardoso de [UNIFESP]
dc.contributor.authorAfonso, Conrado Ramos Moreira
dc.contributor.authorSpinelli, José Eduardo
dc.contributor.authorCheung, Noe
dc.contributor.authorGarcia, Amauri
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.coverageLausanne
dc.date.accessioned2020-07-08T13:09:52Z
dc.date.available2020-07-08T13:09:52Z
dc.date.issued2018
dc.description.abstractOver the last years, magnesium and its alloys have deserved special attention due to their good mechanical properties and promising biomedical applications. In the present investigation the Mg-12 wt.% Zn alloy has been directionally solidified (DS) under an extensive range of cooling rates. Based on the scarceness of characterization works related to both the morphology of the eutectic mixture and the development of equilibrium and non-equilibrium intermetallic particles (IMCs) in Mg-Zn alloys, a number of analyses are performed emphasizing and discussing such aspects. Rod and lamellar eutectic spacings are experimentally correlated with the growth rate and the cooling rate. The volume fraction of rod-like eutectic is shown to increase with the decrease in cooling rate during solidification. The characterization on the DS Mg-12 wt.%Zn samples is carried out using X-ray diffraction (XRD), scanning (SEM) and transmission (TEM) electron microscopies, which allowed the identification of two different non equilibrium IMCs, MgZn2 and Mg4Zn7, which are distributed as nanoparticles throughout the alpha-Mg matrix. The Mg-Zn eutectic morphologies (lamellar and rod-like) are found to be constituted by alpha-Mg/Mg21Zn25 phases, the latter being formed by the decomposition of the eutectic IMC Mg51Zn20 through a eutectoid reaction. (C) 2017 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Campinas, UNICAMP, Dept Mfg & Mat Engn, BR-13083860 Campinas, SP, Brazil
dc.description.affiliationUniv Santa Cecilia, UNISANTA, Postgrad Program Mech Engn, Dept Mech Engn, BR-11045907 Santos, Brazil
dc.description.affiliationUniv Fed Sao Paulo, UNIFESP, Marine Inst, BR-11030400 Santos, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo, UNIFESP, Marine Inst, BR-11030400 Santos, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIDFAPESP: 2014/50502-5
dc.format.extent105-131
dc.identifierhttps://dx.doi.org/10.1016/j.matchemphys.2017.10.032
dc.identifier.citationMaterials Chemistry And Physics. Lausanne, v. 204, p. 105-131, 2018.
dc.identifier.doi10.1016/j.matchemphys.2017.10.032
dc.identifier.issn0254-0584
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/54264
dc.identifier.wosWOS:000418218600013
dc.language.isoeng
dc.publisherElsevier Science Sa
dc.relation.ispartofMaterials Chemistry And Physics
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectMg-Zn alloyen
dc.subjectSolidificationen
dc.subjectMicrostructureen
dc.subjectEutecticen
dc.subjectIntermetallicsen
dc.titleMicrostructure characterization of a directionally solidified Mg-12wt.%Zn alloy: Equiaxed dendrites, eutectic mixture and type/morphology of intermetallicsen
dc.typeinfo:eu-repo/semantics/article
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