Remelting of Primary Solid in Rapid Solidification of Deeply Undercooled Alloy Melts
Jinfu LI1,2(), Yaohe ZHOU1
1 State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2 Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Cite this article:
Jinfu LI, Yaohe ZHOU. Remelting of Primary Solid in Rapid Solidification of Deeply Undercooled Alloy Melts. Acta Metall Sin, 2018, 54(5): 627-636.
Solidification of deeply undercooled alloy melts proceeds with obvious temperature recalescence, during which part of primary solid is inevitably remelted, and the microstructural morphology is inevitably changed. During past decades, great improvement was achieved in modelling crystal growth in undercooled alloy melts, making it possible to quantitatively evaluate the remelting degree of primary solid at different undercoolings. In this paper, the progress in modelling the remelting of primary solid was introduced, and the variation of remelted fraction of primary solid as a function of the alloy feature and undercooling was presented. In combination with experimental results of crystal growth pattern and solidification structure in selected alloys, the mechanisms for grain refinement in undercooled single-phase alloys and anomalous eutectic formation in undercooled eutectic alloys were then discussed.
Fig.1 Schematic of the temperature distribution along a growing branch and the undercooling constitution at the tip[14] (Te—eutectic temperature, TI—temperature at the dendrite tip, ΔT—melt undercooling, ΔTs—temperature rise in the solid, ΔTc,i—solute undercooling, ΔTr,i—curvature undercooling, ΔTk,i—kinetic undercooling, ΔTt—thermal undercooling)
Fig.2 Remelted fraction of primary solid vs initial undercooling in Ni75Cu25[9]
Fig.3 Effects of liquidus slope mi (a), solute redistribution coefficient k (b) and eutectic composition Ce (c) on the remelted fraction of primary solid[14]
Fig.4 Remelted fractions of lamellar α-Ni/β-Ni3Sn eutectics dendrite (a) and α-Ni dendrite (b) when they primarily form in the rapid solidification of undercooled Ni-18.7%Sn (atomic fraction) melt[30]
Fig.5 Variation of the grain size of Ni75Cu25 with undercooling (ΔT1, ΔT2, ΔT3, ΔT4, ΔT5, ΔT *—characteristic undercoolings for grain size change)[9]
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