Modelling eutectic growth in unmodified and modified near-eutectic Al-Si alloy

Tiedje, Niels Skat, Hattel, Jesper H., Taylor, John A. and Easton, Mark A. (2013). Modelling eutectic growth in unmodified and modified near-eutectic Al-Si alloy. In: Ian Stone, Brian McKay and Zhongyun Fan, Light Metals Technology 2013. LMT 2013: 6th International Light Metals Technology Conference, Old Windsor, UK, (343-347). 24-26 July, 2013. doi:10.4028/www.scientific.net/MSF.765.160

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Author Tiedje, Niels Skat
Hattel, Jesper H.
Taylor, John A.
Easton, Mark A.
Title of paper Modelling eutectic growth in unmodified and modified near-eutectic Al-Si alloy
Conference name LMT 2013: 6th International Light Metals Technology Conference
Conference location Old Windsor, UK
Conference dates 24-26 July, 2013
Proceedings title Light Metals Technology 2013   Check publisher's open access policy
Journal name Materials Science Forum   Check publisher's open access policy
Place of Publication Stafa-Zurich, Switzerland
Publisher Trans Tech Publications
Publication Year 2013
Sub-type Fully published paper
DOI 10.4028/www.scientific.net/MSF.765.160
ISBN 9783037857663
9783038261476
9783037955017
ISSN 0255-5476
1662-9752
Editor Ian Stone
Brian McKay
Zhongyun Fan
Volume 765
Start page 343
End page 347
Total pages 5
Chapter number 2
Language eng
Formatted Abstract/Summary
A numerical model that describes solidification of primary aluminium grains and nucleation and growth of eutectic cells is used to analyse the solidification of an Al-12.5wt% Si alloy. Nucleation of eutectic cells is modelled using an Oldfield-type nucleation model where the number of nuclei in the melt is determined by the amount of active nuclei and the local undercooling from the surface to the centre of a plate casting. Eutectic grains are modelled as spheres growing between the dendrites. The growth velocity of the eutectic cells is a function of undercooling. Experimentally determined growth parameters from the literature that depend on the type of modification (unmodified, Na-modified or Sr-modified) are used to describe differences in growth of the alloys. Modelling results are compared with solidification experiments where an Al-12.5wt%Si alloy was cast in unmodified, Na modified and Sr modified forms. The model confirms experimental observations of how modification and alloy composition influence nucleation, growth and finally the size of eutectic cells in the alloys. Modelling results are used to explain how cooling conditions in the casting act together with the nuclei density in the liquid and the growth velocity of the eutectic cells to determine the size and distribution of eutectic cells in the solidified material.
Keyword Solidification
Modelling
Eutectic
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 29 Oct 2013, 21:54:51 EST by Jon Swabey on behalf of School of Mechanical and Mining Engineering