The effect of fluid flow on eutectic growth

Lee, J. H.; Liu, Shan; Trivedi, R.

doi:10.1007/s11661-005-0083-6

Cited by 45 publications

(31 citation statements)

References 24 publications

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“…6. The effect of the natural convection on the eutectic lamellar spacing was quite small in an alloy of eutectic composition, which agreed well with experimental results by Lee, et al [23] .…”

Section: Discussionsupporting

confidence: 91%

Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

2017

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A s one of the most important solidification patterns, eutectic microstructure has been recognized for its significant influence on the ultimate mechanical properties of the materials [1,2] . Since the classical mathematical analysis for the steady-state growth of eutectic alloy was presented by Jackson and Hunt [3] , theoretical studies on eutectic solidification have attracted increasing attention.However, the influence of convection on eutectic growth still lacks sufficient research. Generally, there are two main types of convection considered during the directional solidification of eutectic alloys, i.e., forced convection caused by imposed external fields, and natural convection driven by the solute (or density) difference. Considering that there are many uncertainties in experiments, numerical simulation has become an indispensable way to accurately recover the underlying physics during solidification [4][5][6][7] . Wang et al. [8] performed a Monte-Carlo simulation of eutectic growth with weak convection and found that convection made Abstract: In the present study, the influence of natural convection on the lamellar eutectic growth is determined by a phase-field-lattice Boltzmann study for Al-Cu eutectic alloy. The mass difference resulting from concentration difference led to the fluid flow, and a robust parallel and adaptive mesh refinement algorithm was employed to improve the computational efficiency without any compromising accuracy. Results show that the existence of natural convection would affect the growth undercooling and thus control the interface shape by adjusting the lamellar width. In particular, by alternating the magnitude of the solute expansion coefficient, the strength of the natural convection is changed. Corresponding microstructure patterns are discussed and compared with those under no-convection conditions. the distribution of lamellar spacing more scattered. But beyond that, to the best of our knowledge, there has been no more numerical case to study the effect of convection on eutectic growth. Encouragingly, a robust parallel-adaptive mesh refinement algorithm (Para-AMR) has been developed to efficiently solve the phase field equations including the dendritic [9] and eutectic transitions [10] . The lattice Boltzmann method (LBM) has also emerged with great potential to numerically solve the energy, momentum and mass transport problems by a relaxation to a local equilibrium [11][12][13] . Therefore, it seems reasonable to couple the LBM into eutectic phase-field models to retrieve the interaction of eutectic microstructure and flows.In this work, we coupled the LBM into the developed Para-AMR algorithm to reveal the effect of natural convection on eutectic growth. The phase field model was employed to simulate eutectic evolution while the LBM was for the simultaneous calculation of melt convection. The velocity field near the solid/liquid (S/ L) interface was explored and several key mechanisms were highlighted. In particular, by alternating the magnitude of solute expansion coe...

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Section: Discussionsupporting

confidence: 91%

Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

2017

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“…The effect of gravity-induced fluid flow on eutectic microstructure has also been investigated experimentally for Al-Cu alloys [291]. Different convection modes were achieved by varying the composition from hypo-to hypereutectic.…”

Section: Eutectic Growthmentioning

confidence: 99%

Solidification microstructures and solid-state parallels: Recent developments, future directions

et al. 2009

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Rapid advances in atomistic and phase-field modeling techniques as well as new experiments have led to major progress in solidification science during the first years of this century. Here we review the most important findings in this technologically important area that impact our quantitative understanding of: (i) key anisotropic properties of the solid-liquid interface that govern solidification pattern evolution, including the solid-liquid interface free energy and the kinetic coefficient; (ii) dendritic solidification at small and large growth rates, with particular emphasis on orientation selection; (iii) regular and irregular eutectic and peritectic microstructures; (iv) effects of convection on microstructure formation; (v) solidification at a high volume fraction of solid and the related formation of pores and hot cracks; and (vi) solid-state transformations as far as they relate to solidification models and techniques. In light of this progress, critical issues that point to directions for future research in both solidification and solid-state transformations are identified.

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“…Natural convection plays a dominant role in the formation of a + b lamellar structures [38,39]: in the 4/6 mm tube, 3-D macrosegregation modeling revealed a nearly helical convection pattern in the liquid phase [34]. Between each convection cell, the fluid flow was mostly oriented parallel to the solid-liquid interface.…”

Section: Formation Of a + B Lamellar Structuresmentioning

confidence: 99%

Peritectic solidification of Cu–Sn alloys: Microstructural competition at low speed

et al. 2009

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Directional solidification experiments on Cu-Sn peritectic alloys have been conducted at very low velocity in a high-thermal-gradient Bridgman furnace. The size of the samples has been reduced in order to decrease natural convection and the associated macrosegregation. At the lowest growth rates (0.5 and 0.58 lm s À1 ), eutectic-like a + b lamellar structures have been observed in near-peritectic composition alloys over several millimeters of growth. These structures resulted from a destabilization of a band structure in which a-and b-phases overlay each other. Electron backscattered diffraction measurements revealed that bands and lamellae of a solid phase are continuous and originate from a single nucleus.

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The effect of fluid flow on eutectic growth

Cited by 45 publications

References 24 publications

Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

Solidification microstructures and solid-state parallels: Recent developments, future directions

Peritectic solidification of Cu–Sn alloys: Microstructural competition at low speed

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