Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9830069 | Journal of Crystal Growth | 2005 | 10 Pages |
Abstract
We study the morphological instabilities of a dilute binary alloy during directional solidification into a time-periodic, oscillatory molten zone by modulating the solute field. The basic state, in which the flat melt-solid interface advances in a sinusoidal way, is solved analytically by expanding the governing equations in terms of the assumed-small amplitude of modulation. A linear stability analysis is then performed on the interface considering two specific instability modes: synchronous and subharmonic modes. We find the original Mullins-Sekerka instability can be stabilized synchronously by the imposed modulation. The subharmonic mode occurs with smaller wave numbers and is less critical than the synchronous Mullins-Sekerka mode.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
C.A. Chung, K.H. Ho, P.S. Chou,