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Simulation of the Rheology of Semisolid Alloys by Using a Two-phase Flow Approach

Published online by Cambridge University Press:  21 March 2011

A. Ludwig ,
M. Wu  and
T. Hofmeister
A. Ludwig
Affiliation:
Foundry-Institute of the Technical University Aachen, Intzestr. 5 D-52056 Aachen, Germany
M. Wu
Affiliation:
Foundry-Institute of the Technical University Aachen, Intzestr. 5 D-52056 Aachen, Germany
T. Hofmeister
Affiliation:
Foundry-Institute of the Technical University Aachen, Intzestr. 5 D-52056 Aachen, Germany
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Abstract

Semisolid alloys exhibit a shear rate history dependent flow behavior. The increasing interest on numerical modeling of thixo-casting processes makes it quite important to understand the flow behavior of semisolids. Its apparent viscosity is the key parameter for the numerical models. In this paper a two phase approach is used to investigate the rheology of semisolid alloys. It is assumed that both, liquid and solid phase, can be regarded as inter-penetrating continua with its own viscosity. Thus, each phase is thought to behave as a Newtonian fluid. The simulation results show that the rheology of the two-phase flow is determined by the interaction between the solid and the liquid, i.e. the momentum exchange between the two phases. Non-Newtonian flow behavior of the solid-liquid mixture is predicted although both phases are considered as Newtonian fluids.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y5.6
Copyright
Copyright © Materials Research Society 2001

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References

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