Abstract
Liquid-solid interface morphological evolution of SCN-2wt%H2O alloy was investigated in the presence of shear flow. It has been found that shear flow strikingly enhances the stability of planar interface at lower pulling rates. In the intermediate range of pulling rate, the interface experiences periodical oscillating “planar-cellular” and “cellular-dendritic” growth patterns. The formation of oscillating growth modes can be explained by two reasons: (i) The stabilizing effect induced by shear flow competes with the growing destabilizing effect by the increase of pulling rate, which provides the driving force for morphological evolution; and (ii) the establishment of stable solute field at the liquid-solid interface needs a period of time, leading to the result that the interface evolution can not stay stable at the equilibrium state. However, as the puling rate becomes higher, it plays more and more important roles in pattern selection and dendritic growth forms.
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References
Lin X, Li T, Wang L L, et al. A time-dependent interface stability during directional solidification of a single phase alloy (I). Acta phys sin, 2004, 53: 3971–3977
Huang W D, Lin X, Li T, et al. A time-dependent interface stability during directional solidification of a single phase alloy (II). Acta Physica Sin, 2004, 53: 3978–3983
Huang W D, Shang B L, Zhou Y H. An experimental study of morphology development of solidification interface. Acta physica sin, 1991, 40: 323–330
Zhang M, Maxworthy T. The interactive dynamics of flow and directional solidification in a Hele-Shaw cell-Part 1. Experimental investigation of parallel shear flow J Fluid Mech, 2002, 470: 247–268
Buchholz A, Engler S. The influence of forced convection on solidification interfaces. Compu Mater Sci, 1996, 7: 221–227
Brattkus K, Davis S H. Flow induced morphological instabilities: Stagnation-point flows. J Crystal Growth, 1998, 89: 423–427
Brattkus K, Davis S H. Flow-induced morphological instabilities: The rotating disc. J Crystal Growth, 1998, 87: 385–396
Delves R T. Theory of stability of a solid-liquid interface during growth from stirred melts. II. J Crystal Growth, 1971, 8: 13–25
Tiller W A, Jackson K A, Rutter J W, et al. The redistribution of solute atoms during the solidification of metals. acta Metall, 1953, 1: 428–437
Mullins W W, Sekerka R F. Stability of a planar interface during solidification of a dilute binary alloy. J App Phys 1964, 35: 444–451
Huang T, Liu S, Yang Y, et al. Coupling of Couette flow and crystal morphologies in directional freezing. J Crystal Growth, 1993, 128: 167–172
Delves R T. Theory of stability of a solid-liquid interface during growth from stirred melts. J Crystal Growth, 1968 3,4: 562–568
Schulze T P, Davis S H. The influence of oscillatory and steady shears on interfacial stability during directional solidification. J Crystal Growth, 1994, 143: 317–333
Liu S, Lu D Y, Huang T et al. Effect of liquid flow on primary arm space of constrained columnar. Acta Metall Sin, 1993, 29: 1–6
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Supported by the National Natural Science Foundation of China (Grant Nos. 50331040 and 50702046), and Science-Technology Innovation Foundation of Northwestern Polytechnical University (Grant No.2008KJ02031)
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Wang, J., Chen, C., Zhai, W. et al. Periodical oscillating interface in directional growth under shear flow. Chin. Sci. Bull. 54, 4432–4437 (2009). https://doi.org/10.1007/s11434-009-0270-8
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DOI: https://doi.org/10.1007/s11434-009-0270-8