Long-time scale morphological dynamics near the onset of instability during directional solidification of an alloy
Resource
Journal of Crystal Growth 264 (1-3): 379-384
Journal
Journal of Crystal Growth
Journal Issue
264
Pages
379-384
Date Issued
2004
Date
2004
Author(s)
Lan, C. W.
Shih, C. J.
Hsu, W. T.
Abstract
The long-time scale nonlinear morphological dynamics of the interface during the thin-film directional solidification of an SCN/acetone alloy have been simulated by an efficient phase field simulation. In addition to the agreement with classic theories, the mode transition (λ c↔λc/2) through periodic-chaotic-periodic solute pinch-off after a step change of the solidification speed is illustrated; λc is the critical wavelength. The tip-splitting, coarsening, and overshooting during mode transition are consistent with experimental observations. However, the transition time is up to 5D L/kV2 making a real experiment at lower solidification speed very difficult to perform, where DL is the acetone diffusivity, k the segregation coefficient, and V the solidification speed. The subcriticality of the primary bifurcation is further confirmed by simulation. © 2003 Elsevier B.V. All rights reserved.
Type
journal article
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