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Morphological stability of a binary alloy: thermodiffusion and temperature-dependent diffusivity

par Van Vaerenbergh, Stefan ;Coriell, Sam;McFadden, Geoffrey
Référence Journal of crystal growth, 223, 4, page (565-572)
Publication Publié, 2001

Article révisé par les pairs

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Résumé :

The effect of a temperature-dependent solute diffusion coefficient on the morphological stability of a binary alloy during directional solidification is treated by a linear stability analysis. The Soret effect (thermodiffusion) is also included in the analysis. Specific calculations are carried out for a tin alloy containing silver for which the diffusion coefficient has a linear dependence on temperature. Although the temperature dependence of the diffusion coefficient has little effect on the critical concentration for the onset of morphological stability, it causes a significant change in the wavelength at the onset of instability.