The effect of grain refining on the microsegregation of aluminium-magnesium alloy

Matthew, M, Russo, S, Gorman, J and Paterson, P 2001, 'The effect of grain refining on the microsegregation of aluminium-magnesium alloy', Micron, vol. 32, no. 8, pp. 841-850.

Document type: Journal Article
Collection: Journal Articles

Title The effect of grain refining on the microsegregation of aluminium-magnesium alloy
Author(s) Matthew, M
Russo, S
Gorman, J
Paterson, P
Year 2001
Journal name Micron
Volume number 32
Issue number 8
Start page 841
End page 850
Total pages 9
Publisher Pergamon
Abstract Aluminium alloy 5182 (AA5182) contains approximately 4.5% Mg as its principal alloying addition, and is most commonly used to make the lid of the aluminium can. With a view to the possible future development of a micro-macro model to describe the casting of this alloy, the effect of grain refinement on the microsegregation of magnesium in industrial rolling ingots of AA5182 has been investigated at three different depths beneath the edge of the ingot (and hence three different cooling rates)-- 60, 140 and 600 mm. The accuracy with which published microsegregation models are able to predict the solute distribution profile is assessed. It has been found that the magnesium segregation range (Cmax-Cmin) of the grain refined samples actually increases as cooling rate decreases. The range of the non grain refined samples is independent of cooling rate. The solute concentration profiles of the theoretical microsegregation models examined do not correlate well with the experimentally measured profiles. It is concluded that this poor correlation is due to either the effect of post solidification homogenisation or the influence of macroscopic variables during the cast. A more accurate model of post solidification homogenisation is required to assess the relative contribution of each of these factors to the poor correlation. In addition, it is concluded that the measurement of segregation is best done using a combination of EDX mapping and point analysis techniques to locate and quantify the areas of maximum and minimum solute concentration.
DOI - identifier 10.1016/S0968-4328(00)00092-5
Copyright notice © 2001 Elsevier Science
ISSN 0968-4328
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