Abstract
Fe-48.8% Sn monotectic, Fe-40% Sn hypomonotectic and Fe-58% Sn hypermonotectic alloys have been rapidly solidified during free fall processing in drop tube. For droplets of 100–1000 μm, the maximum undercooling for Fe-48.8% Sn, Fe-40% Sn and Fe-58% Sn alloys is 270, 282 and 288 K respectively. For Fe-48.8% Sn monotectic alloy, a homogeneously dispersed microstructure can be obtained when the droplet diameter is small, and the Marangoni migration velocity Vm is 37 times as fast as Stokes velocity Vs when the dispersion sphere radius is 6 μm and undercooling is 30 K. For Fe-40% Sn hypomonotectic alloy, the microstructure undergoes a transition from columnar α-Fe dendrites distributed in Sn-rich matrix to α-Fe particles. The growth velocity of α-Fe dendrite changes from 0.45 to 4.65 m/s when the droplet diameter varies from 1000 to 100 μm. For Fe-58.8% Sn hypermonotectic alloy, the grain size of primary α-Fe dendrites decreases remarkably when undercooling increases.
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Wang, N., Wei, B., Phase separation and structural evolution of undercooled Fe−Sn monotectic alloy, Mater. Sci. Eng., 2003, A345: 145–154.
Grugel, R. N., Hellawell, A., Alloy solidification in systems containing a liquid miscibility gap, Metall. Trans. A, 1981, 12A: 669–681.
Aoi, I., Yoshida, M., Fukunaga, H. et al., Influence of growth direction on the microstructure of uni direction-ally solidified Cu−Pb monotectic alloy using zone-melt technique, J. Cryst. Growth, 2001, 222: 806–815.
Cao, C. D., Wang, N., Wei, B., Containerless rapid solidification of undercooled Cu−Co peritectic alloys, Science in China, Ser. A, 2000, 43: 1318–1326.
Vinet, B., Potard, C., Solidification of Al-In monotectic alloy by configuration Bridgman horizontal, J. Cryst. Growth, 1983, 61: 355–361.
Predel, B., Ratke, L., Fredriksson, H., A European perspective: Fluid Sciences and Materials Science in Space (ed. Walter, H. U.), New York: Springer-Verlag, 1987, 517–565.
Shan, S., Grugel, R. N., Lichter, B. D., Directional solidification of lead-copper immiscible alloys in a cyclic gravity environment, Metall. Trans. A., 1988, 19A: 2677–2680.
Gelles, S. H., Markworth, A. J., Microgravity studies in the liquid-phase immisicible system: aluminum-indium, AIAA J., 1978, 16: 431–437.
Potard, C., Materials Processing in the Reduced Gravity Environment of Space, New York: Elsevier Science, 1982, 543.
Andrews, J. B., Sandlin, A. C., Curreri, P. A., Influence of gravity level and interfacial energies on dispersion-forming tendencies in hypermonotectic Cu−Pb−Al alloys. Metall. Trans. A, 1988, 19A: 2645–2650.
Grugel, R. N., Proc. of NASA Microgravity Materials Science Conference, Huntsville: Alabama, 1998, 289.
Rogers, J. R., Davis, R. H., Modeling of collision and coalescence of droplets during microgravity processing of Zn−Bi immiscible alloys, Metall. Trans. A, 1990, 21A: 59–68.
Greer, A. L., Nucleation and solidification studies using drop-tubes, Mater. Sci. Eng., 1994, A178: 113–120.
Yao, W. J., Wei, B., Rapid growth of nickel dendrite in highly undercooled Ni−Mo alloys, Science in China, Ser. E, 2003, 46: 593–606.
Okamoto, H., Binary Alloy Phase Diagrams (ed. Massalski, T. B.), ASM International, USA., 1990, 1774.
Wang, N., Wei, B., Rapid solidification behavior of Ag−Cu−Ge ternary eutectic alloy, Mater. Sci. Eng., 2001, A307: 80–90.
Adkins, N. J. E., Tsakiropoulos, P., The Microstructure of High Pressure Gas Atomised Powders, Mater. Sci. Technol., 1991, 7: 334–340.
Lee, E., Ahn., S., Solidification progress and heat transfer analysis of gas-atomized alloy droplets during spray forming, Acta Metall. Mater., 1994, 42: 3231–3243.
Kurz, W., Fisher, D. J., Fundamentals of Solidification, Switzerland: Trans Tech., 1998, 32.
Spaepen, F., A structural model for the solid-liquid interface in monatomic systems, Acta Metall., 1975, 23: 729–743.
Busch, R., Gärtner, F., Borchers, C. et al., Microstructure development during rapid solidification of highly supersaturated Cu−Co alloys, Acta Metall., 1995, 43: 3467–3475.
Marangoni, C., Study on surface tension of fluid, Ann. Phys. Chem., 1871, 143: 337–354.
Ratke, L., Voorhees, P. W., Growth and Coarsening, New York: Springer-Verlag, 2002, 239.
Lipton, J., Kurz, W., Trivedi., R., Rapid dendrite growth in undercooled alloys, Acta Metall, 1987, 35: 957–964.
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Liu, X., Lu, X. & Wei, B. Rapid monotectic solidification under free fall condition. Sci. China Ser. E-Technol. Sci. 47, 409–420 (2004). https://doi.org/10.1360/04ye0024
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DOI: https://doi.org/10.1360/04ye0024