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- W2064254200 abstract "The rheology of SiC particulate-(Al-6.5wt.%Si) composite slurries was explored and compared with that of the base matrix alloy through the use of continuous cooling and shearing, isothermal shearing at varying shear rates, step change shearing from steady state isostructural conditions, and experiments in which shearing is interrupted for varying rest times. The rheological behavior of composite slurries shows both thixotropic (time-dependent decrease in viscosity at a constant shear rate) and pseudoplastic (decrease in viscosity with increasing shear rate at a constant slurry structure) behaviors. Isostructural experiments on the composite slurries revealed a newtonian behavior (i.e.η = τ/Yγ = k) beyond a high shear rate limit. The rheology of fully molten composite slurries over the low to high shear rate range indicates the existence of a low shear rate newtonian region, an intermediate pseudoplastic region and a high shear rate newtonian region. The isostructural studies indicate that the viscosity of a composite slurry depends upon the shearing history of a given volume of material. The rheological behavior of slurries sheared within the liquid + solid region of the matrix alloy is similar to that of composite slurries sheared above the liquidus. However, an unexpected shear thinning was noted for SiC particulate + α slurries compared with semisolid metallic slurries at the same solid fraction. The implications of these findings for the processing of slurries into cast components is discussed." @default.
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- W2064254200 title "Rheological behavior of SiC particulate-(Al-6.5wt.%Si) composite slurries at temperatures above the liquidus and within the liquid + solid region of the matrix" @default.
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- W2064254200 doi "https://doi.org/10.1016/0921-5093(91)90232-c" @default.
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