Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/12421

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Campo DCValorIdioma
dc.contributor.authorPuga, Hélder-
dc.contributor.authorGabriel, Joaquim-
dc.contributor.authorBarbosa, J.-
dc.contributor.authorSeabra, Eurico-
dc.contributor.authorRibeiro, Carlos Silva-
dc.contributor.authorProkic, Miodrag-
dc.date.accessioned2011-05-18T07:12:22Z-
dc.date.available2011-05-18T07:12:22Z-
dc.date.issued2011-
dc.identifier.citationH. Puga, J. Gabriel, J. Barbosa, E. Seabra, S. Ribeiro, M. Prokic- Evaluation of ultrasonic aluminium degassing by piezoelectric sensor. Journal of Materials Processing Technology 211 (2011) 1026-1033.por
dc.identifier.issn0924-0136-
dc.identifier.urihttps://hdl.handle.net/1822/12421-
dc.description.abstractThe purpose of this work was the development of a reliable technique to evaluate the intensity of acoustic cavitation during degassing of aluminium melts and to use it to select the optimum processing time for an envisaged degassing efficiency. A high sensitivity piezoelectric disk type device was used as a sensing feedback in water and liquid AlSi9Cu3 alloy. The signal acquisition and processing was carried out on a dedicated LabVIEW® based application which allowed real-time monitoring of the piezoelectric sensor’s data and ultrasonic parameters. Standard Fast Fourier Transform was applied to obtain the dominant frequencies, as well as the sub and ultra-harmonics. It was found that the amplitude of the FFT sub-harmonic (f/2) was the best indicator to evaluate the process degassing efficiency, and it could be used to select the optimal processing time, independently of other variables. The developed methodology was applied to several AlSi9Cu3 melts, and validated by measuring the final alloy densities and the volume fraction of porosities, revealing that it is an efficient, fast and cost effective technique to evaluate the degassing treatment of aluminium alloys. Experimental curves of AlSi9Cu3 alloy degassing efficiency as a function of f/2 amplitude are presented for different degassing times.por
dc.description.sponsorshipFCT - Fundação para a Ciência e Tecnologiapor
dc.language.isoengpor
dc.publisherElsevier Sciencepor
dc.rightsopenAccesspor
dc.subjectMeltingpor
dc.subjectDegassingpor
dc.subjectCastingpor
dc.subjectAluminiumpor
dc.subjectPiezoelectricpor
dc.subjectAluminium alloyspor
dc.subjectPiezoelectric devicespor
dc.titleEvaluation of ultrasonic aluminium degassing by piezoelectric sensorpor
dc.typearticlepor
dc.peerreviewedyespor
sdum.publicationstatuspublishedpor
oaire.citationStartPage1026por
oaire.citationEndPage1033por
oaire.citationIssue6por
oaire.citationTitleJournal of Materials Processing Technologypor
oaire.citationVolume211por
dc.identifier.doi10.1016/j.jmatprotec.2011.01.003por
dc.subject.wosScience & Technologypor
sdum.journalJournal of Materials Processing Technologypor
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