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Primary dendrite arm spacing during transient directional solidification of Al alloys with low redistribution coefficients |
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| Authors: | José E. Spinelli Kleber S. Cruz Manuel V. Canté |
| Affiliation: | 1. Department of Materials Engineering , Federal University of Rio Grande do Norte–UFRN , PO Box 1524, 59072-970, Lagoa Nova Campus, Natal, RN, Brazil;2. Faculté de Saint-Jérome , IM2NP, UMR 6137, University Paul Cézanne Aix-Marseille III , Service 142, 13397 Marseille Cedex 20, France;3. Department of Materials Engineering , University of Campinas–UNICAMP , PO Box 6122-13083-970–Campinas, SP, Brazil |
| Abstract: | Particular analytical expressions based on a curve fitting on numerical results for primary dendritic growth have been proposed in the literature to encompass binary alloy systems whose redistribution coefficient (k 0) approaches zero. To date, these expressions have not been checked against experimental results of transient solidification. The present study developed a comparative analysis between the theoretical predictions furnished by such expressions and results from transient solidification experiments with low k 0 aluminum alloys. The analysis has shown that the proposed approach generally describes the primary dendritic spacing during solidification of Al–Sn alloys which are characterized by very low k 0 values as well as by very large solidification ranges. |
| Keywords: | casting solidification aluminum alloys microstructural characterization |