Abstract
Pb-2.2 wt.% Sb alloy was directionally solidified in 1, 2, 3 and 7 mm diameter crucibles. Pb-Sb alloy presents a solutally unstable case. Under plane-front conditions, the resulting macrosegregation along the solidified length indicates that convection persists even in the 1 mm diameter crucible. Al-2 wt.% Cu alloy was directionally solidified because this alloy was expected to be stable with respect to convection. Nevertheless, the resulting macrosegregation pattern and the microstructure in solidified examples indicated the presence of convection. Simulations performed for both alloys show that convection persists for crucibles as small as 0.6 mm of diameter. For the solutally stable alloy, Al-2 wt.% Cu, the simulations indicate that the convection arises from a lateral temperature gradient.
Original language | English (US) |
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Pages (from-to) | 397-405 |
Number of pages | 9 |
Journal | Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing |
Volume | 357 |
Issue number | 1-2 |
DOIs | |
State | Published - Sep 25 2003 |
Keywords
- Al-Cu
- Convection
- Directional solidification
- Pb-Sb
- Smaller diameter crucibles
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering