Periodic layer formation in the growth of dilute binary alloys

Roberto E. Rozas; Alexander L. Korzhenevskii; Richard Bausch; Rudi Schmitz

Keywords: crystal growth, rapid solidification, Banded structures, Striation, Phase-field model, Capillary-wave model

Abstract

The oscillatory growth of a dilute binary alloy in rapid directional solidification has recently been described by a nonlinear oscillator equation, assuming a uniform diffusion constant of the solute component in both phases. In a more realistic model with a vanishing diffusion coefficient in the solid phase this leads to the formation of durable layers of alternating solute concentrations. Due to the Mullins-Sekerka instability, the high-concentration layers commonly feature a dendritic microstructure. We conjecture that the mechanism behind this so-called banded-structure effect also applies to some of the quite independently discussed striation phenomena in a large number of general crystal-growth processes. (C) 2014 Published by Elsevier B.V.

Más información

Título según WOS: Periodic layer formation in the growth of dilute binary alloys
Título de la Revista: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volumen: 413
Editorial: ELSEVIER SCIENCE BV
Fecha de publicación: 2014
Página de inicio: 394
Página final: 399
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0378437114005044
DOI:

10.1016/j.physa.2014.06.029

Notas: ISI