Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
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.
Chen, Jun; Sung, P. K.; Poirier, D. R.; and de Groh, H. C. III, "Directional Solidification and Convection in Small Diameter Crucibles" (2003). Chemical & Biomedical Engineering Faculty Publications. 55.
Chen, J., Sung, P., Tewari, S., Poirier, D., , & de Groh III, H. (2003). Directional solidification and convection in small diameter crucibles. Materials Science and Engineering: A, 357(1-2), 397 - 405. doi:10.1016/S0921-5093(03)00223-5
NOTICE: this is the author’s version of a work that was accepted for publication in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 357, 1-2, (September 25, 2003) DOI 10.1016/S0921-5093(03)00223-5