Abstract
The fluid flow of a stircast slurry is very complex due to its thixotropic behaviour, i.e. at a fixed fraction of solid the viscosity is shear-rate and time dependent. The fraction of solid in its turn depends on the temperature gradient and the cooling rate in the stir caster. In order to understand the effects of the variables upon final alloy composition, particle size distribution and fluid flow, it is necessary to simultaneously perform viscosimetric measurements and microscopic observations. Metals do not allow this, but transparent organic compounds do. Therefore we used 98% pure succinodinitrile as a model alloy to study nucleation and solidification during stirring. Our microscopic observations of solidifying succinodinitrile in a stirred cell showed that it formed the same spherical or rosette-shaped particles as aluminium alloys. Our viscosimetric studies showed that partially solidified succinodinitrile behaves thixotropically.
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