Propagative selection of tilted array patterns in directional solidification
نویسندگان
چکیده
منابع مشابه
Selection of doublet cellular patterns in directional solidification through spatially periodic perturbations
Pattern formation at the solid-liquid interface of a growing crystal was studied in directional solidification using a perturbation technique. We analyzed both experimentally and numerically the stability range and dynamical selection of cellular arrays of ‘‘doublets’’ with asymmetric tip shapes, separated by alternate deep and shallow grooves. Applying an initial periodic perturbation of arbit...
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Critical Role of Crystalline Anisotropy in the Stability of Cellular Array Structures in Directional Solidification.
We calculate numerically the full Floquet-Bloch stability spectrum of cellular array structures in a symmetric model of directional solidification. Our results demonstrate that crystalline anisotropy critically influences the stability of these structures. Without anisotropy, the stability balloon of cells in the plane of wave number and velocity closes near the onset of morphological instabili...
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We use a computationally efficient phase-field formulation [B. Echebarria, Phys. Rev. E 70, 061604 (2004)] to investigate the origin and dynamics of sidebranching in directional solidification for realistic parameters of a dilute alloy previously studied experimentally [M. Gorgelin and A. Pocheau, Phys. Rev. E 57, 3189 (1998)]. Sidebranching is found to result either from noise amplification or...
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ژورنال
عنوان ژورنال: Physical Review Materials
سال: 2018
ISSN: 2475-9953
DOI: 10.1103/physrevmaterials.2.053403