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Simulation of the Columnar-to-Equiaxed Transition in Alloy Solidification -- the Effect of Nucleation Undercooling, Density of Nuclei in Bulk Liquid and Alloy Solidification Range on the Transition.

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posted on 2009-03-12, 12:19 authored by H. J. Dai, Hongbiao Dong, Helen V. Atkinson, P. D. Lee
A coupled cellular automaton-finite difference (CA-FD) model is used to simulate the detailed dendritic structure evolution of the columnar-to-equiaxed transition (CET) for Al-Cu alloys during solidification. The effects of material properties (nucleation undercooling, density of nuclei in bulk liquid and alloy solidification range) on the CET are investigated. Simulated results reveal that: (1) equiaxed grains form at an earlier stage with a smaller critical nucleation undercooling; (2) CET is promoted if the density of nuclei in bulk liquid is increased; (3) extending the alloy solidification range promotes the CET. Finally, CET maps corresponding to different alloy concentrations are constructed, illustrating the relationship between processing conditions and the resulting grain structures for alloys with different solidification ranges.

History

Citation

Solid State Phenomena, 2008, 139, pp. 129-134.

Published in

Solid State Phenomena

Publisher

Trans Tech Publications, Switzerland.

issn

1012-0394

Copyright date

2008

Available date

2009-03-12

Publisher version

http://www.scientific.net/SSP.139.129

Language

en

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