Comparative study of the influence of natural convection on directional solidification of Al-3.5 wt% Ni and Al-7 wt% Si alloys
Journal
Advances in Space Research
Journal Volume
41
Journal Issue
12
Pages
2112-2117
Date Issued
2008
Author(s)
Abstract
We present numerical simulations of thermosolutal convection for directional solidification of Al-3.5 wt% Ni and Al-7 wt% Si. Numerical results predict that fragmentation of dendrite arms resulting from dissolution could be favored in Al-7 wt% Si, but not in Al-3.5 wt% Ni. Corresponding experiments are in qualitative agreement with the numerical predictions. Distinguishing the two fragmentation mechanisms, namely dissolution and remelting, is critical during experiments on earth, when fluid flow is dominant. © 2007 COSPAR.
Type
journal article