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Directional solidification and convection in small diameter crucibles
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chen, J. Sung, P. K. Poirier, D. R. DeGroh II, H. C. Tewari, S. N. |
| Copyright Year | 2003 |
| Description | 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. |
| File Size | 7316463 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030032199 |
| Archival Resource Key | ark:/13960/t92858x99 |
| Language | English |
| Publisher Date | 2003-01-01 |
| Access Restriction | Open |
| Subject Keyword | Metals And Metallic Materials Directional Solidification Crystals Separation Transport Properties Temperature Gradients Aluminum Alloys Crucibles Computerized Simulation Convection Tin Alloys Liquid-solid Interfaces Copper Alloys Lead Alloys Alloying Magnetic Fields Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
