Evolution of microstructural length scales during solidification of magnesium alloys

Gurevich, S. M.; Amoorezaei, Morteza; Montiel, David; Provatas, Nikolas

doi:10.1016/j.actamat.2012.02.055

Cited by 18 publications

(18 citation statements)

References 18 publications

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“…The following questions are specially addressed: Previous work242526282930 has confirmed that a morphological transition from degenerate seaweed to tilted dendrite occurs as the thermal gradient is decreased or the pulling velocity is increased. However, the mechanism of this transition and the dynamic characteristics of degenerated seaweed, especially the relationship between the tip-splitting instability and the sidebranching, are relatively less studied.…”

mentioning

confidence: 99%

Degenerate seaweed to tilted dendrite transition and their growth dynamics in directional solidification of non-axially oriented crystals: a phase-field study

Xing

Dong

et al. 2016

Sci Rep

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We report the results of a phase-field study of degenerate seaweed to tilted dendrite transition and their growth dynamics during directional solidification of a binary alloy. Morphological selection maps in the planes of (G, Vp) and (ε4, Vp) show that lower pulling velocity, weaker anisotropic strength and higher thermal gradient can enhance the formation of the degenerate seaweed. The tip undercooling shows oscillations in seaweed growth, but it keeps at a constant value in dendritic growth. The M-S instability on the tips and the surface tension anisotropy of the solid-liquid interface are responsible for the formation of the degenerate seaweed. It is evidenced that the place where the interfacial instability occurs determines the morphological transition. The transient transition from degenerate seaweed to tilted dendrite shows that dendrites are dynamically preferred over seaweed. For the tilted dendritic arrays with a large tilted angle, primary spacing is investigated by comparing predicted results with the classical scaling power law, and the growth direction is found to be less sensitive to the pulling velocity and the primary spacing. Furthermore, the effect of the initial interface wavelength on the morphological transition is investigated to perform the history dependence of morphological selection.

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mentioning

confidence: 99%

Degenerate seaweed to tilted dendrite transition and their growth dynamics in directional solidification of non-axially oriented crystals: a phase-field study

Xing

Dong

et al. 2016

Sci Rep

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“…This evolution is characterized by plateau-like regions of constant primary spacing that are observed experimentally [90], which can be related to the hysteretic nature of the dynamical selection of the spacing as a function of pulling velocity [61]. Adding the effect of repulsive grain boundaries [109], they investigated grain boundary coalescence at high solid fraction, the formation of highly segregated liquid pools, and the evolution of solid connectivity during late stage solidification [60,102].…”

Section: Intragrain Microstructure Selectionmentioning

confidence: 95%

“…Dynamic (adaptive) remeshing techniques for PF calculations [117] -also applicable to atomistic phase-field-crystal calculations [6] -allow efficient simulations up to the scale of an entire dendritic array. Resulting simulations have shed light on several microstructure selection mechanisms [3,61,4,109,60,102], and have been coupled to larger-scale heat transfer models and probabilistic nucleation models to predict microstructure distribution in processes such as laser powder deposition [44] and welding [103].…”

Section: Computationally Intensive Phase-field Implementationsmentioning

confidence: 99%

Atomistic to continuum modeling of solidification microstructures

Karma

Tourret

2016

Current Opinion in Solid State and Materials Science

103

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a b s t r a c tWe summarize recent advances in modeling of solidification microstructures using computational methods that bridge atomistic to continuum scales. We first discuss progress in atomistic modeling of equilibrium and non-equilibrium solid-liquid interface properties influencing microstructure formation, as well as interface coalescence phenomena influencing the late stages of solidification. The latter is relevant in the context of hot tearing reviewed in the article by M. Rappaz in this issue. We then discuss progress to model microstructures on a continuum scale using phase-field methods. We focus on selected examples in which modeling of 3D cellular and dendritic microstructures has been directly linked to experimental observations. Finally, we discuss a recently introduced coarse-grained dendritic needle network approach to simulate the formation of well-developed dendritic microstructures. This approach reliably bridges the well-separated scales traditionally simulated by phase-field and grain structure models, hence opening new avenues for quantitative modeling of complex intra-and inter-grain dynamical interactions on a grain scale.Published by Elsevier Ltd.

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“…[103][104][105][106][107] A cusp interface energy model 108,109) has also been used to treat the facet and a high-anisotropy kinetic coefficient 110,111) has been modeled. Recently, dendrite growth simulations have been performed both in the 2D [112][113][114] and 3D 115,116) spaces for materials with the hexagonal close-packed structure, such as Mg alloys, which are the lightest metallic materials, and therefore, very important as future industrial materials.…”

Section: Interface Anisotropymentioning

confidence: 99%

Phase-field Modeling and Simulations of Dendrite Growth

Takaki

2014

ISIJ Int.

175

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The phase-field method has recently emerged as the most powerful computational tool for simulating complicated dendrite growth. However, these simulations are still limited to two-dimensional or small three-dimensional spaces; therefore, to realistic and practical dendritic structures, it is crucial to develop a large-scale phase-field simulation technique. This review discusses the phase-field modeling and simulations of dendrite growth from the fundamental model to cutting-edge very-large-scale simulations. First, phase-field models for the dendrite growth of pure materials and binary alloys and their histories are summarized. Then, models and studies of interface anisotropy, polycrystalline solidification, and solidification with convection, which are very important in dendritic solidification, are reviewed. Finally, by introducing very-large-scale phase-field simulations performed recently using a graphics processing unit supercomputer, the power, potential and importance of the very-large-scale phase-field simulation are emphasized.

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Evolution of microstructural length scales during solidification of magnesium alloys

Cited by 18 publications

References 18 publications

Degenerate seaweed to tilted dendrite transition and their growth dynamics in directional solidification of non-axially oriented crystals: a phase-field study

Degenerate seaweed to tilted dendrite transition and their growth dynamics in directional solidification of non-axially oriented crystals: a phase-field study

Atomistic to continuum modeling of solidification microstructures

Phase-field Modeling and Simulations of Dendrite Growth

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