Microstructure and rheological behavior of grain refined and modified semi-solid A356 Al–Si slurries

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dc.contributor.authorNafisi, S.
dc.contributor.authorLashkari, O.
dc.contributor.authorGhomashchi, R.
dc.contributor.authorAjersch, F.
dc.contributor.authorCharette, A.
dc.date.issued2006
dc.description.abstractA comprehensive study was carried out to establish the effect of melt treatment using Ti-B grain refiner and Sr modifier additions on the microstructural evolution and rheological properties of A356 aluminum alloy in the semisolid state. Rheocast billets of 75 mm in diameter and ∼140 mm in length, prepared by the SEED process, were deformed and several parameters were investigated to characterize the flow behavior of the billets in a compression test. Strain-time graphs were used to calculate the viscosity and liquid segregation was monitored to identify the optimum conditions for melt treatment. It is shown that non-treated alloy has the highest apparent viscosity. Refined semisolid billets have smaller particle size and more globularity of primary α-Al particles and as a result deform and flow more easily. It is postulated that modifier addition reduces the liquid surface tension and leads to improved deformability. © 2006 Acta Materialia Inc.
dc.description.statementofresponsibilityShahrooz Nafisi, Omid Lashkari, Reza Ghomashchi, Frank Ajersch, Andre Charette
dc.identifier.citationActa Materialia, 2006; 54(13):3503-3511
dc.identifier.doi10.1016/j.actamat.2006.03.016
dc.identifier.issn1359-6454
dc.identifier.issn1873-2453
dc.identifier.orcidGhomashchi, R. [0000-0003-3633-2296]
dc.identifier.urihttp://hdl.handle.net/2440/66639
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.rightsCopyright © 2006 Acta Materialia Inc.
dc.source.urihttps://doi.org/10.1016/j.actamat.2006.03.016
dc.subjectSemisolid
dc.subjectSEED process
dc.subjectRheological properties
dc.subjectViscosity
dc.subjectGrain refiner
dc.subjectModifier
dc.titleMicrostructure and rheological behavior of grain refined and modified semi-solid A356 Al–Si slurries
dc.typeJournal article
pubs.publication-statusPublished

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