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Mechanical Blocking Mechanism for the Columnar to Equiaxed Transition

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Abstract

Mechanical blocking of the columnar front during the columnar to equiaxed transition (CET) is studied by quantitatively comparing the CET positions obtained with one stochastic model and two deterministic models for the unidirectional solidification of an Al-7 (wt pct) Si alloy. One of the deterministic models is based on the solutal blocking of the columnar front, whereas the other model is based on the mechanical blocking. The solutal-blocking model and the mechanical-blocking model with the traditional blocking fraction of 0.49 give columnar zones larger than those predicted with the stochastic model. When a blocking fraction of 0.2 is adopted, however, the agreement is very good for a range of nucleation undercoolings and number density of equiaxed grains. Therefore, changing the mechanical-blocking fraction in deterministic models from 0.49 to 0.2 seems to model more accurately the mechanical-blocking process that can lead to the CET.

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Acknowledgments

The authors thank Fundação de Amparo à Pesquisa do Estado de São Paulo (Grant No. 03/08576-7) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant No. 475451/04-0) for the financial support and the scholarship to V.B. Biscuola.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, University of São Paulo, Av. Prof. Mello Moraes, 2463, São Paulo, SP, 05508-900, Brazil

    V.B. Biscuola (Graduate Student) & M.A. Martorano (Professor)

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  1. V.B. Biscuola
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  2. M.A. Martorano
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Correspondence to M.A. Martorano.

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Manuscript submitted on February 26, 2008.

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Biscuola, V., Martorano, M. Mechanical Blocking Mechanism for the Columnar to Equiaxed Transition. Metall Mater Trans A 39, 2885–2895 (2008). https://doi.org/10.1007/s11661-008-9643-x

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  • DOI: https://doi.org/10.1007/s11661-008-9643-x

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