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Effect of partition coefficient on microsegregation during solidification of aluminium alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.
2014 (English)In: International Journal of Minerals, Metallurgy and Materials, ISSN 1674-4799, Vol. 21, no 10, 980-989 p.Article in journal (Refereed) Published
Abstract [en]

In the modeling of microsegregation, the partition coefficient is usually calculated using data from the equilibrium phase diagrams. The aim of this study was to experimentally and theoretically analyze the partition coefficient in binary aluminum-copper alloys. The samples were analyzed by differential thermal analysis (DTA), which were melted and quenched from different temperatures during solidification. The mass fraction and composition of phases were measured by image processing and scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDS) unit. These data were used to calculate as the experimental partition coefficients with four different methods. The experimental and equilibrium partition coefficients were used to model the concentration profile in the primary phase. The modeling results show that the profiles calculated by the experimental partition coefficients are more consistent with the experimental profiles, compared to those calculated using the equilibrium partition coefficients.

Place, publisher, year, edition, pages
2014. Vol. 21, no 10, 980-989 p.
Keyword [en]
aluminum copper alloys, solidification, partition coefficient, microsegregation, numerical modeling, differential thermal analysis
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-155789DOI: 10.1007/s12613-014-0999-1ISI: 000343161500006ScopusID: 2-s2.0-84919662420OAI: diva2:763458

QC 20141114

Available from: 2014-11-14 Created: 2014-11-13 Last updated: 2014-11-14Bibliographically approved

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Fredriksson, Hasse
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