On the solute diffusion length in the Interdependence Model: Dendritic versus non-Dendritic interface

Prasad, Arvind, Yuan, Lang, Lee, Peter D., Easton, Mark and StJohn, David (2015). On the solute diffusion length in the Interdependence Model: Dendritic versus non-Dendritic interface. In: H. K. Chikwanda and S. Chikosha, Light Metals Technology 2015. Light Metals Technology 2015, South Afria, (461-467). 27-29 July 2015. doi:10.4028/www.scientific.net/MSF.828-829.461

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Author Prasad, Arvind
Yuan, Lang
Lee, Peter D.
Easton, Mark
StJohn, David
Title of paper On the solute diffusion length in the Interdependence Model: Dendritic versus non-Dendritic interface
Conference name Light Metals Technology 2015
Conference location South Afria
Conference dates 27-29 July 2015
Proceedings title Light Metals Technology 2015   Check publisher's open access policy
Journal name Materials Science Forum   Check publisher's open access policy
Place of Publication Pfaffikon, Switzerland
Publisher Trans Tech Publications
Publication Year 2015
Year available 2015
Sub-type Fully published paper
DOI 10.4028/www.scientific.net/MSF.828-829.461
ISBN 9783038355625
ISSN 0255-5476
Editor H. K. Chikwanda
S. Chikosha
Volume 828-829
Start page 461
End page 467
Total pages 7
Chapter number 9
Collection year 2016
Language eng
Formatted Abstract/Summary
The Interdependence model currently uses an analytical expression for a moving planar interface to calculate the solute diffusion length designated as x’dl in the model. Upon nucleation within an alloy melt (i.e. when the solid embryo starts to grow), the interface grows with a spherical front which then breaks down into a dendritic interface. The time required for this breakdown is a subject for separate research. In this paper, we explore the validity of using a planar interface in the early stages of nucleation and growth of metal alloys as used in the Interdependence model. The diffusion field ahead of a planar interface, in theory, has an exponentially changing composition of infinite length. In the Interdependence model, x’dl is assumed to be where this exponentially decreasing composition profile in the liquid ahead of the interface (for k < 1) reduces to within 1% of a quantity proportional to the nominal alloy composition, C0, far from the interface. A numerical solidification model, μMatIC, is used to simulate the growth of a single grain with a dendritic interface in 2D and 3D. The numerical model is capable of generating the solute profile ahead of the growing grain which is used to evaluate the solute diffusion length that can be compared with the results obtained from the planar interface model. The comparisons were made with both 1% and 0.1% cut-off criteria. The results indicate that the 1% assumption being used in the planar front diffusion length calculation is a good approximation for the Interdependence model.
Keyword Grain Refinement
Interdependence model
Solute Diffusion Length
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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Created: Fri, 28 Aug 2015, 17:29:50 EST by Dr Arvind Prasad on behalf of School of Mechanical and Mining Engineering