Hostname: page-component-8448b6f56d-tj2md Total loading time: 0 Render date: 2024-04-19T08:14:42.851Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. DIN 53014, Kapillarviskosimeter mit Kreis- und Rechteckquerschnitt zur Bestimmung von Fließkurven, Berlin: Beuth Verlag GmbH, 1992.6.Google Scholar
2. Paradies, C.J., Rappaz, M., Imwinkelried, T. and Gabathuler, J. P., Proceedings of the 4th International Conference on Semi-Solid Processing of Alloys and Composites, Sheffield, June 1996: 115–119.Google Scholar
3. Flemings, M. C., Proceeding of the 3th International Conference on Semi-Solid Processing of Alloys and Composites, Tokyo, June, 1994: 3–6.Google Scholar
4. Ghosh, D., Fan, R. and VanSchilt, C., Proceeding of the 3th International Conference on Semi-Solid Processing of Alloys and Composites, Tokyo, June 1994: 85–94.Google Scholar
5. Ludwig, A., Ehlen, G., Pelzer, M., Sahm, P.R., 9th Int. Conf. on Modelling of Casting, Welding and Advanced Solidification Process, Hrsg.: P.R. Sahm u.a., Aachen (2000) S. 175 ff.Google Scholar
6. Beckermann, C., Wang, C.Y., 3. Chapter in “Annual Review of Heat Transfer”, 6, ed.: Tien, C.L., 115 (1995).Google Scholar
7. Beckermann, C., JOM, 47 (Mar. 1997): 13–17.Google Scholar
8. Feller, R.J., Beckermann, C., Metall. Trans., 28B, 1165 (1997) pp. 1165.Google Scholar
9. Wang, C.Y., Ahuja, S., Beckermann, C., Groh, H.C. de III, Metall. Trans., 26B, 111 (1995).Google Scholar
10. Bird, R. B., Steward, W. E. and Lightfoot, E. N., Transport Phenomena, New York: John Wiley & Sons, (1960).Google Scholar
11. Arnberg, L., Chai, G. and Backerud, L., Mater. Sci. and Eng. A173 (1993): 101–103.Google Scholar
12. Turng, L. S. and Wang, K. K., J. of Mter. Sci., 26: 2173–2183.Google Scholar