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Rheological characterization of semi-solid A356 aluminium alloy

Samanta, SK and Chattopadhyay, H and Dutta, P and Barman, N and Das, Prosenjit (2012) Rheological characterization of semi-solid A356 aluminium alloy. In: 12th International Conference on Semi-Solid Processing of Alloys and Composites, 8-11 October, 2012, Cape Town, South Africa.

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/SSP.1...

Abstract

Rheological behavior of semi-solid slurries forms the backbone of semi-solid processing of metallic alloys. In particular, the effects of several process and metallurgical parameters such as shear rate, shear time, temperature, rest time and size, distribution and morphology of the primary phase on the viscosity of the slurry needs in-depth characterization. In the present work, rheological behaviour of the semisolid aluminium alloy (A356) slurry is investigated by using a high temperature Searle type Rheometer using concentric cylinders. Three different types of experiment are carried out: isothermal test, continuous cooling test and steady state test. Continuous decrease in viscosity is observed with increasing shear rate at a fixed temperature (isothermal test). It is also found that the viscosity increases with decreasing temperature for a particular shear rate due to increasing solid fraction (continuous cooling test). Thixotropic nature of the slurry is confirmed from the hysteresis loops obtained during experimentation. Time dependence of slurry viscosity has been evaluated from the steady state tests. After a longer shearing time under isothermal conditions the starting dendritic structure of the said alloy is transformed into globular grains due to abrasion, agglomeration, welding and ripening.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Scientific.net.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Francis Jayakanth
Date Deposited: 25 Mar 2014 09:06
Last Modified: 25 Mar 2014 09:06
URI: http://eprints.iisc.ac.in/id/eprint/48675

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