A solidification model for unmodified, Na-modified and Sr-modified Al-Si alloys

Tiedje, N. S., Hattel, J., Taylor, J. A. and Easton, M. A. (2012). A solidification model for unmodified, Na-modified and Sr-modified Al-Si alloys. In: The 3rd International Conference on Advances in Solidification Processes: Proceedings. International Conference on Advances in Solidification Processes (3rd, ICASP, 2011), Aachen/Rolduc, Germany, (1-6). 7-10 June 2011. doi:10.1088/1757-899X/27/1/012033


Author Tiedje, N. S.
Hattel, J.
Taylor, J. A.
Easton, M. A.
Title of paper A solidification model for unmodified, Na-modified and Sr-modified Al-Si alloys
Conference name International Conference on Advances in Solidification Processes (3rd, ICASP, 2011)
Conference location Aachen/Rolduc, Germany
Conference dates 7-10 June 2011
Proceedings title The 3rd International Conference on Advances in Solidification Processes: Proceedings   Check publisher's open access policy
Journal name IOP Conference Series: Materials Science and Engineering   Check publisher's open access policy
Place of Publication Temple Back, Bristol, U.K.
Publisher Institute of Physics Publishing
Publication Year 2012
Year available 2011
Sub-type Fully published paper
DOI 10.1088/1757-899X/27/1/012033
ISBN *****************
ISSN 1757-8981
1757-899X
Volume 27
Issue 012033
Start page 1
End page 6
Total pages 6
Collection year 2012
Language eng
Formatted Abstract/Summary An addition of small amounts of Na and Sr is commonly used in the industry to modify the eutectic in Al-Si alloys. Both Na and Sr suppress nucleation of the eutectic forcing nucleation and growth to take place at higher undercooling than in the unmodified material. Thus the scale of the eutectic and the shape of the Si crystals are modified to a fine fibrous form so that the ductility of the material is increased. In the present work a one-dimensional numerical model is proposed that describes nucleation and growth of both primary dendrites and eutectic grains as a function of cooling conditions and modification. The model assumes that dendrites nucleate easily when the liquidus temperature is reached and that they grow as heat is extracted by the mould. Nucleation of the eutectic grains depends on local undercooling and growth is governed by a balance between growth of the eutectic grains and the rate at which heat is extracted by the mould. Experimental data is used to determine constants in the nucleation function. It is shown how cooling conditions and mode of modification influence nucleation and growth conditions.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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