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|Title:||Microstructure and rheological behavior of grain refined and modified semi-solid A356 Al–Si slurries|
|Citation:||Acta Materialia, 2006; 54(13):3503-3511|
|Publisher:||Pergamon-Elsevier Science Ltd|
|Shahrooz Nafisi, Omid Lashkari, Reza Ghomashchi, Frank Ajersch, Andre Charette|
|Abstract:||A 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.|
|Rights:||Copyright © 2006 Acta Materialia Inc.|
|Appears in Collections:||Aurora harvest 5|
Materials Research Group publications
Mechanical Engineering publications
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