Periodic layer formation in the growth of dilute binary alloys

Roberto E. Rozas, Alexander L. Korzhenevskii, Richard Bausch and Rudi Schmitz

Physica A: Statistical Mechanics and its Applications, 2014, vol. 413, issue C, 394-399

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.

Keywords: Crystal growth; Rapid solidification; Banded structures; Striation; Phase-field model; Capillary-wave model (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:413:y:2014:i:c:p:394-399

DOI: 10.1016/j.physa.2014.06.029

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