Paper Titles
Characterization of Fe-Rich Intermetallic Phases in a 6xxx Series Al Alloy
p.1721
Effects of Alloy Chemistry and Solidification Rate on the Mechanical Properties of an Al-9Si-1Cu Alloy for Powertrain Applications
p.1727
Tear Toughness Evaluation of High-Quality Squeeze-Cast and Rheocast Aluminium Alloy Castings
p.1733
The Effect of Casting Variables on the Structure of Hypereutectic Al-Si Alloys
p.1741
Solidification Behaviour of 357 Al-Alloy under Intensive Forced Convection
p.1747
A Combined Numerical and Experimental Study of the Effects of Controlled Fluid Flow on Alloy Solidification
p.1753
Effects of High Frequency Electromagnetic Field on Improving Macro/Micro Structure and Reducing Segregation for Aluminium Alloy Billets
p.1759
The Impact of Partial Drainage on Chemical Composition of 356 Al-Si Alloy
p.1765
CDS Method for Casting Aluminium-Based Wrought Alloy Compositions: Theoretical Framework
p.1771

Solidification Behaviour of 357 Al-Alloy under Intensive Forced Convection

Article Preview

Abstract:

Solidification behaviour of 357 Al-alloy under intensive forced convection in the rheo-die-casting (RDC) process, was investigated experimentally to understand the effects of the intensity of forced convection and shearing time on the nucleation and growth behaviour. It was found that under intensive forced convection, heterogeneous nucleation occurred continuously throughout the entire volume of the solidifying melt. All the nuclei could survive due to the uniform temperature and composition fields created by the forced convection. This has been named as ‘effective and continuous nucleation’. It is also found that the nuclei grow spherically with an extremely fast growth rate. This makes the primary solidification essentially a slow coarsening process, in which Ostwald ripening takes place by dissolution of the smaller particles. In addition, it was found that intensive forced convection suppresses partially the formation of the primary phase, promote nucleation of the primary particles, and hinders the particle growth.

You might also be interested in these eBooks
Aluminium Alloys 2006 - ICAA10 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

1747-1752

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.1747

Citation:

Cite this paper

Online since:

July 2006

Authors:

Michael Hitchcock, Zhong Yun Fan

Keywords:

Forced Convection, Growth, Nucleation, Solidification

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] M.C. Flemings, Metall. Trans. 22A (1991), 957.

Google Scholar

[2] D.H. Kirkwood, Inter. Mater. Rev. 39 (1994), 173.

Google Scholar

[3] Z. Fan, Inter. Mater. Rev. 47 (2002), 49.

Google Scholar

[4] W.J. Boettinger, S.R. Coriell, A.L. Greer, A. Karma, W. Kurz, M. Rappaz, R. Trivedi, Acta Mater. 48 (2000), 43.

DOI: 10.1016/s1359-6454(99)00287-6

Google Scholar

[5] Z. Fan, X. Fang and S. Ji, Mater. Sci. Eng., A412 (2005), 298.

Google Scholar

[6] M. Volmer, A. Z. Webber, Phys. Chem. 119 (1925), 277.

Google Scholar

[7] D. Turnbul, in Progr. Met. Phys. 4 (1953), 333.

Google Scholar

[8] B. Chalmers, Principles of Solidification, New York, John Wiley &Sons, Inc. (1995).

Google Scholar

[9] R.S. Qin, Z. Fan, Conf. Proc. on Semisolid Processing of Alloys and Composites, Turin, 2000, p.819.

Google Scholar

[10] A. Das, S. Ji, Z. Fan, Acta Mater. 50 (2002), 4571.

Google Scholar

[11] R.S. Qin, E.R. Wallach, Mater. Sci. Engng. 357A (2003), 45.

Google Scholar

[12] I.M. Lifshitz, V.V. Slyozov. J. Phys. Chem. Solids, 11 (1961), 35.

Google Scholar

[13] C. Z. Wagner, Electrochem. 65 (1968), 581.

Google Scholar

[14] S. Ji, Z. Fan, M.J. Bevis, Mater. Sci. Eng. 299A (2001), 210.

Google Scholar