Primary Dendrite Trunk Diameter in Al-7wt% Si Alloy Directionally Solidified Aboard the International Space Station
IOP Conference Series: Materials Science and Engineering
Under a NASA (National Aeronautics and Space Agency)-ESA (European Space Agency) collaborative research project, MICAST (Microstructure formation in casting of technical alloys under a diffusive and magnetically controlled convection conditions), three Al-7wt% Si samples (MICAST-6, MICAST-7 and MICAST2-12) were directionally solidified at growth speeds varying from 10 to 50 µm s-1 aboard the International Space Station to determine the effect of mitigating convection on the primary dendrite array. The observed primary dendrite trunk diameters during steady-state growth of MICAST samples show a good agreement with predictions from a coarsening based model developed by the authors. The trunk diameters in the terrestrial-grown equivalent samples were larger than those predicted from the model. This suggest that thermosolutal convection increases the trunk diameter of primary dendrites, perhaps by increasing their tip radius due to compositional changes.
Upadhyay, S. R.; Tewari, Surendra N.; Ghodes, M.; Grugel, R. N.; Poirier, D. R.; and Lauer, M., "Primary Dendrite Trunk Diameter in Al-7wt% Si Alloy Directionally Solidified Aboard the International Space Station" (2019). Chemical & Biomedical Engineering Faculty Publications. 167.
SR Upadhyay et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 529 012022
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Paper presented at: Joint Conference of 5th International Conference on Advances in Solidification Processes (ICASP) and 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR), in Salzburg, AUSTRIA, JUN 17-21, 2019.
This research was supported by NASA-Grants (NNX08AN49G and NNX14AJ73G).