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Rheology of A356 Alloy During Solidification Under Stirring

Barman, N and Dutta, P (2014) Rheology of A356 Alloy During Solidification Under Stirring. In: TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS, 67 (1). pp. 101-104.

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Official URL: http://dx.doi.org/10.1007/s12666-013-0325-z

Abstract

This work presents an experimental investigation on the rheology of A356 alloy in semisolid state using a high temperature Couette type viscometer. The molten liquid, resides in the annular space between the cylinders, is stirred and cooled continuously during experiments. The stirring results in fragmentation of dendrites which are transported into bulk liquid and form a semisolid slurry. The viscosity of the slurry is distinct in nature, which depends on microstructure of the suspended dendrites after coarsening. Hence, in the work, the variation of viscosity and microstructure is captured during cooling under different process parameters such as shear rate and cooling rate. Angular velocity of the inner cylinder and torque applied to stir the slurry are recorded to determine the apparent viscosity of the slurry. Temperature of the slurry is recorded to calculate the fraction of solids present in the slurry. For micrograph analysis, a vacuum quartz tube is used to remove the slurry-samples during experiments and they are quenched them in water.

Item Type: Journal Article
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Additional Information: copyright for this article belongs to SPRINGER
Keywords: Solidification; Stirring; Semisolid slurry; Viscosity; Microstructure
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 28 Nov 2013 11:25
Last Modified: 28 Nov 2013 11:25
URI: http://eprints.iisc.ernet.in/id/eprint/47834

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