Dynamics of spacing adjustment and recovery mechanisms of ABAC-type growth pattern in ternary eutectic systems

Mohagheghi, Samira; Şerefoğlu, Melis

doi:10.1016/j.jcrysgro.2017.04.008

Cited by 11 publications

(15 citation statements)

References 22 publications

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“…For a working temperature of

K, taken from the Calphad database [ 29 ], Table 1 exemplarily shows the results of the equilibrium calculations in step one. The calculated equilibrium concentrations are in good correlation with the experimentally reported near eutectic compositions in [ 28 , 30 ]. For the approximation of the Gibbs energies, second-order polynomials of the form

are used.…”

Section: Simulations and Resultssupporting

confidence: 85%

“…Initial simulations have already shown that an increase in the angular velocity

can lead to instabilities, such as oscillations of the phase boundaries and the elimination of lamellae. Such behavior has also been observed in experimental works [ 23 , 28 ]. In addition, the systematic variation of anisotropic interfacial energies strength, is a further possible topic for upcoming research, which can be investigated with the presented RDS setup.…”

Section: Discussionsupporting

confidence: 78%

“…Instantly, based on the achieved theoretic validation of the modeled and simulated system in DS studies, the investigation of the rotating directional solidification simulation are performed in the following section. The results of the DS and RDS simulations are subsequently compared with the experimental predictions reported in [ 22 , 28 , 30 ].…”

Section: Simulations and Resultsmentioning

confidence: 99%

“…As the evolved microstructures of the bulk samples are experimentally reported to be 2D in the steady states [ 28 ], the investigated samples in this work are considered to be two-dimensional, and a 2D heat distribution is assumed in the temperature field formulation. However, the derived formulation can still be used in the 3D cases of such material systems.…”

Section: Methodsmentioning

confidence: 99%

“…Apart from the above mentioned advantages of the RDS technique, it is worth mentioning that the method is limited to thin sample observations or bulks of materials with 2D growth patterns in steady states. The ternary eutectic system is an example of such a system with a 2D lamellar microstructure [ 28 ]. Moreover, due to its low melting point (

K [ 29 ]), has become a practical material system for an in situ observation of the ongoing mechanisms in solidification processes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Rotating Directional Solidification of Ternary Eutectic Microstructures in Bi-In-Sn: A Phase-Field Study

2022

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For the first time, the experimental processing condition of a rotating directional solidification is simulated in this work, by means of a grand-potential-based phase-field model. To simulate the rotating directional solidification, a new simulation setup with a rotating temperature field is introduced. The newly developed configuration can be beneficent for a more precise study of the ongoing adjustment mechanisms during temperature gradient controlled solidification processes. Ad hoc, the solidification of the ternary eutectic system Bi-In-Sn with three distinct solid phases α,β,δ is studied in this paper. For this system, accurate in situ observations of both directional and rotating directional solidification experiments exist, which makes the system favorable for the investigation. The two-dimensional simulation studies are performed for both solidification processes, considering the reported 2D patterns in the steady state growth of the bulk samples. The desired αβαδ phase ordering repeat unit is obtained within both simulation types. By considering anisotropy of the interfacial energies, experimentally reported tilted lamellae with respect to normal vectors of the solidification front, as well as predominant role of αβ anisotropy in tilting phenomenon, are observed. The results are validated by using the Jackson–Hunt analysis and by comparing with the existing experimental data. The convincing agreements indicate the applicability of the introduced method.

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“…For a working temperature of

are used.…”

Section: Simulations and Resultssupporting

confidence: 85%

“…Initial simulations have already shown that an increase in the angular velocity

Section: Discussionsupporting

confidence: 78%

Section: Simulations and Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

K [ 29 ]), has become a practical material system for an in situ observation of the ongoing mechanisms in solidification processes.…”

Section: Introductionmentioning

confidence: 99%

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Rotating Directional Solidification of Ternary Eutectic Microstructures in Bi-In-Sn: A Phase-Field Study

2022

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Role of interfacial energy and liquid diffusivities on pattern formation during thin-film three-phase eutectic growth

Khanna

Choudhury

2021

J Mater Sci

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In this paper, we investigate three-phase eutectic growth during thin-film directional solidification of a model symmetric ternary eutectic alloy. In contrast to two-phase eutectics that have only a single possibility, abab. . ., as the growth pattern, during three-phase eutectic growth infinite possibilities exist. Here, we explore the possible existence of pattern selection influenced by the change in the solid-solid interfacial energies and the diffusivities. We begin the study by estimating the undercooling vs. spacing variation for the simplest possible configurations of pattern lengths 3 and 4, where phase-field simulations are utilized to quantify the influence of the solid-solid interfacial energy and the contrast in the component diffusivities. Subsequently, extended simulations consisting of multiple periods of abd. . . as well as abdb. . . are carried out for assessing the stability of the configurations to long-wavelength perturbations in spacing. Thereafter, growth competition among the simplest patterns is investigated through phase-field simulations of coupled growth of configurations of the type abd ½ m abdb ½ n , (m, n) being the respective number of periods. Finally, pattern selection is studied by initializing with random initial configurations and classifying the emerging patterns based on the phase sequences. The principal finding is that, while there is no strong phase selection, between the solid-solid interfacial energies and the contrast in the component diffusivities, we find the latter to strongly influence pattern morphology.

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On the Growth Dynamics of Nearly-Locked Grain in the Three-Phase In-Bi-Sn Eutectic System

Mohagheghi

Şerefoğlu

2019

Metall Mater Trans A

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Dynamics of spacing adjustment and recovery mechanisms of ABAC-type growth pattern in ternary eutectic systems

Cited by 11 publications

References 22 publications

Rotating Directional Solidification of Ternary Eutectic Microstructures in Bi-In-Sn: A Phase-Field Study

Rotating Directional Solidification of Ternary Eutectic Microstructures in Bi-In-Sn: A Phase-Field Study

Role of interfacial energy and liquid diffusivities on pattern formation during thin-film three-phase eutectic growth

On the Growth Dynamics of Nearly-Locked Grain in the Three-Phase In-Bi-Sn Eutectic System

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