Stability characteristics of the mush affected by the solid layer below
Resource
Journal of Crystal Growth 255 (3-4): 369-378
Journal
Journal of Crystal Growth
Journal Issue
255
Pages
369-378
Date Issued
2003
Date
2003
Author(s)
Chang, Min Hsing
Abstract
In directional solidification of binary alloys, a dendritic mush is formed between the bulk melt above and the eutectic solid below. We investigate the convective instabilities in such a three-layer system during solidification process, which differs from previous two-layer model by the solid layer. Due to the existence of the solid layer, the mush/solid interface is allowed to deform so that the mushy layer becomes less stable while the stability of the melt is virtually unchanged. The mushy layer also becomes less stable when the latent heat of fusion generated in the mush is larger, while the stability of the melt above is not affected because the heat is transferred through the solid layer towards the cooling boundary below. Present results may help reflect the reality that the heat transferring to the cooling boundary decreases with time so that the stability of the mush will be enhanced during solidification process, and explain the discrepancy between former theoretical predictions and experimental measurements. © 2003 Elsevier Science B.V. All rights reserved.
Subjects
A1. Convection; A1. Directional solidification; A1. Fluid flows; A1. Heat transfer; A2. Growth from solutions
Other Subjects
Binary alloys; Cooling; Eutectics; Flow of fluids; Heat convection; Interfaces (materials); Solidification; Solid layers; Crystal growth
Type
journal article
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