The surface tension force of anisotropic interphase boundaries is perpendicular to the solidification front during eutectic growth

The irregular growth dynamics of the so-called locked (tilted) lamellar eutectic grains that are observed in directional solidification of nonfaceted/nonfaceted eutectic alloys, is attributable to a strong surface tension anisotropy of the interphase boundaries, which enters into the local-equilibri...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 27; no. 1; pp. 012088 - 5
Main Authors Bottin-Rousseau, S, Şerefoǧlu, M, Akamatsu, S, Faivre, G
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 12.01.2012
Subjects
Anisotropy
Approximation
Boundaries
Directional solidification
Eutectic alloys
Eutectics
Interphase
Liquid-solid interfaces
Phase boundaries
Solidification
Surface tension
Tilt
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Summary:The irregular growth dynamics of the so-called locked (tilted) lamellar eutectic grains that are observed in directional solidification of nonfaceted/nonfaceted eutectic alloys, is attributable to a strong surface tension anisotropy of the interphase boundaries, which enters into the local-equilibrium (Young-Herring) condition at the trijunctions of the solid-liquid interfaces. Based on real-time observations of locked eutectic growth in thin samples, we propose that the lamellar tilt angle is selected by the system in such a way that the Hoffmann-Calm surface tension force ( vector) of the interphase boundaries is approximatively perpendicular to the solidification front.
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ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/27/1/012088