TY - JOUR
T1 - Primary Dendrite Trunk Diameter in Al-7wt% Si Alloy Directionally Solidified Aboard the International Space Station
AU - Upadhyay, S. R.
AU - Tewari, S. N.
AU - Ghodes, M.
AU - Grugel, R. N.
AU - Poirier, D. R.
AU - Lauer, M.
N1 - Funding Information:
This research was supported by NASA-Grants (NNX08AN49G and NNX14AJ73G). Appreciation is expressed to all the scientists and engineers from NASA and ESA whose combined effort made this research possible, and to Dr Men G. Chu (ALCOA) for providing the Al-7Si alloy feed-stock.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2019/6/17
Y1 - 2019/6/17
N2 - 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.
AB - 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.
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U2 - 10.1088/1757-899X/529/1/012022
DO - 10.1088/1757-899X/529/1/012022
M3 - Conference article
AN - SCOPUS:85067895394
SN - 1757-8981
VL - 529
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012022
T2 - Joint 5th International Conference on Advances in Solidification Processes, ICASP 2019 and 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining, CSSCR 2019
Y2 - 17 June 2019 through 21 June 2019
ER -