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Modeling structure parameters of irregular eutectic growth: Modification of Magnin-Kurz theory

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Abstract

A new approach to irregular eutectic growth (faceted/nonfaceted crystallization) in Fe-C and Al-Si alloys has been presented in this article. The results of unidirectional crystallization of the irregular eutectic in the Fe-C, Al-Si, and Al-Fe systems were used for the experimental verification of the resulting model. For the oriented graphite, α(Al)-Si and α(Al)-Al3Fe eutectics, a decrease of the interlamellar spacing λ and in protrusion δβ of the nonfaceted phase (austenite, α(Al)) by the leading faceted phase (graphite, silicon, and Al3Fe), the increase of growth rate v was observed. The Magnin-Kurz theory of irregular eutectic growth has been modified in order to better understand the physical mechanisms driving the crystallization process. A comparison of the measured and calculated average λ values has revealed good agreement for the (γ)Fe-graphite, α(Al)-Si, and α(Al)-Al3Fe eutectics. The developed model also considered the influence of the material constants of the examined alloys on the interlamellar spacing and protrusion of the leading phase—graphite, silicon, and Al3Fe. It has been found that material constants such as the wetting angle, diffusion coefficient, and Gibbs-Thomson coefficient are of great importance in this eutectic growth.

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Authors and Affiliations

  1. the AGH University of Science and Technology, 30-059, Cracow, Poland

    E. Guzik (Professor) & D. Kopyciński (Assistant Professor)

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  1. E. Guzik
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  2. D. Kopyciński
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Guzik, E., Kopyciński, D. Modeling structure parameters of irregular eutectic growth: Modification of Magnin-Kurz theory. Metall Mater Trans A 37, 3057–3067 (2006). https://doi.org/10.1007/s11661-006-0187-7

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  • DOI: https://doi.org/10.1007/s11661-006-0187-7

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