PublicaciĂłn: PERIODIC LAYER FORMATION IN THE GROWTH OF DILUTE BINARY ALLOYS
Fecha
2014
Autores
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PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Resumen
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.
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STRIATION, RAPID SOLIDIFICATION, PHASE-FIELD MODEL, CRYSTAL GROWTH, CAPILLARY-WAVE MODEL, BANDED STRUCTURES
