Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/337289
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dc.contributor.CRUESPUNIVERSIDADE ESTADUAL DE CAMPINASpt_BR
dc.contributor.authorunicampBrollo, Gabriela Lujan-
dc.contributor.authorunicampTamayo, Daimer Velázquez-
dc.contributor.authorunicampZoqui, Eugênio José-
dc.typeArtigopt_BR
dc.titleThermodynamic evaluation of the thixoformability of Al-Si-Cu alloyspt_BR
dc.contributor.authorBrollo, Gabriela Lujan-
dc.contributor.authorTarnayo, Daimer Velazquez-
dc.contributor.authorTorres, Luis Vanderlei-
dc.contributor.authorZoqui, Eugenio Jose-
dc.subjectAnálise térmicapt_BR
dc.subject.otherlanguageThermal analysispt_BR
dc.description.abstractThe aim of this work was to evaluate the thixoformability of Al-(2 to 7 wt%) Si-Cu alloys by differential thermal analysis (DTA), differential scanning calorimetry (DSC) and CALPHAD simulation. Thermoanalytical data were generated for exothermic (rheocasting) and endothermic (thixoforming) cycles under different kinetic conditions (heating and cooling rates of 5, 10, 15, 20 and 25 degrees C/min). The findings indicate that the SSM critical temperatures and liquid fractions are directly affected by the kinetic conditions, chemical composition and heat-flow direction and that the measured values of these critical temperatures and liquid fractions vary according to the thermodynamic evaluation technique used (Calphad simulation, DSC or DTA). The SSM working window (a) became smaller as the heating/cooling rates and Si content increased; (b) was larger for rheocasting (solidification) than for thixoforming (melting) operations; (c) was on average approximately 12 degrees C wider and covered a range of mass fractions approximately 0.12 greater for DSC measurements than for DTA measurements; and (d) had a low sensitivity for all the conditions analyzed, indicating the thermodynamic stability of the Al-Si-Cu system. CALPHAD simulation successfully predicted several transformations and the thermodynamic behavior of the temperatures and liquid fractions analyzed. The DTA and DSC techniques yielded discrepant results for some of the critical points investigated, such as the limits of the SSM working window. The majority of the DSC cycles were more sensitive to variations in kinetic conditions, heat-flow direction and chemical composition than the corresponding DTA cycles. Furthermore, the tertiary Al2Cu phase transformation could not be identified in many of the DTA cycles. For these reasons, DTA should be used with caution when predicting the thermodynamic behavior of potential raw materials for SSM processingpt_BR
dc.relation.ispartofCalphadpt_BR
dc.publisher.cityOxfordpt_BR
dc.publisher.countryReino Unidopt_BR
dc.publisherElsevierpt_BR
dc.date.issued2019-
dc.date.monthofcirculationDec.pt_BR
dc.language.isoengpt_BR
dc.description.volume67pt_BR
dc.rightsFechadopt_BR
dc.sourceWOSpt_BR
dc.identifier.issn0364-5916pt_BR
dc.identifier.eissn1873-2984pt_BR
dc.identifier.doi10.1016/j.calphad.2019.101671pt_BR
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S0364591619301324pt_BR
dc.description.sponsorshipCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQpt_BR
dc.description.sponsorshipCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESpt_BR
dc.description.sponsorshipFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPpt_BR
dc.description.sponsordocumentnumber88881.131045/2016-01pt_BR
dc.description.sponsordocumentnumber470572/2011-6pt_BR
dc.description.sponsordocumentnumber2009/08478-1; 2013/09961-3; 2015/22143-3pt_BR
dc.date.available2020-03-24T18:42:24Z-
dc.date.accessioned2020-03-24T18:42:24Z-
dc.description.provenanceSubmitted by Sanches Olivia (olivias@unicamp.br) on 2020-03-24T18:42:24Z No. of bitstreams: 0. Added 1 bitstream(s) on 2020-07-20T14:20:09Z : No. of bitstreams: 1 000501935500005.pdf: 11335046 bytes, checksum: 549273537eff861356d3458ff18cbe13 (MD5)en
dc.description.provenanceMade available in DSpace on 2020-03-24T18:42:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2019en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/337289-
dc.contributor.departmentsem informaçãopt_BR
dc.contributor.departmentsem informaçãopt_BR
dc.contributor.departmentDepartamento de Engenharia de Manufatura e Materiaispt_BR
dc.contributor.unidadeFaculdade de Engenharia Mecânicapt_BR
dc.subject.keywordSemisolid materials processingpt_BR
dc.subject.keywordCALPHADpt_BR
dc.subject.keywordDSCpt_BR
dc.subject.keywordThixoformabilitypt_BR
dc.subject.keywordThermodynamic characterizationpt_BR
dc.subject.keywordAl-Si-Cu alloyspt_BR
dc.identifier.source000501935500005pt_BR
dc.creator.orcid0000-0002-0427-9251pt_BR
dc.creator.orcid0000-0002-5892-7779pt_BR
dc.creator.orcid0000-0002-3614-0051pt_BR
dc.type.formArtigopt_BR
dc.identifier.articleid101671pt_BR
dc.description.sponsorNoteThe authors would like to thank the Brazilian research funding agencies FAPESP (São Paulo Research Foundation – projects 2009/08478-1, 2013/09961-3 and 2015/22143-3), CNPq (National Council for Scientific and Technological Development – project 470572/2011-6) and CAPES (Federal Agency for the Support and Improvement of Higher Education – notice 23/2016, process 88881.131045/2016-01) for providing financial support for this study. The authors are also indebted to the Faculty of Mechanical Engineering at the University of Campinas and the Faculty of Mechanical Engineering at University of Oriente, and the Federal Institute of Education, Science and Technology of São Paulo – IFSP for the practical support very kindly provided.pt_BR
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