Quasi-isotropic and locked grain growth dynamics in a three-phase eutectic system

Mohagheghi, Samira; Şerefoğlu, Melis

doi:10.1016/j.actamat.2018.03.019

Cited by 15 publications

(30 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mohagheghi et al. [ 22 ] have conducted an RDS study of the system in thin samples and have observed the same

stacking sequences as found in DS experiments with circular trajectories. This structure is reported to be consistent for a wide variation range of the affecting parameters, such as the sample thickness and the growth velocity.…”

Section: Introductionmentioning

confidence: 60%

“…In these experimental setups, the sample is rotated with respect to an applied thermal gradient field with a predefined angular velocity. Hence, the growth velocities of the solids for example, vary proportionally to the distance from the center of rotation [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…For grains with a negligible solid/solid interface anisotropy (floating grains) , circular growth trajectories have been observed in RDS experiments. On the contrary, a tilted growth of the solidified phases, with respect to the solid/liquid interface normals, occurs for grains with significant anisotropy amounts (locked grains) [ 21 , 22 ]. Rátkai et al [ 27 ] have studied the effects of the interfacial energy anisotropies on the pattern formation in binary eutectic Ag-Cu system by means of the phase-field method.…”

Section: Introductionmentioning

confidence: 99%

“…However, a tilted growth of the solid phases has also been observed in the locked grains. It has been observed that the

interface anisotropy has a more affective role in the formation of the inclined lamellae compared with an anisotropy of the

interface [ 22 ]. This investigated behavior of the interfacial anisotropies is another reason which makes the system favorable for the first investigations of the rotating directional solidification process within phase-field simulations.…”

Section: Introductionmentioning

confidence: 99%

“…Next, the simulation setup and the used parameters are introduced. To validate the generated material system, DS simulations are performed in the desired growth velocity ranges of the experimental DS and RDS studies [ 22 , 30 ], respectively. The mentioned validation is performed by Jackson–Hunt analysis and by comparing the obtained results with the reported experimental data in the literature.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Mohagheghi et al. [ 22 ] have conducted an RDS study of the system in thin samples and have observed the same

Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…However, a tilted growth of the solid phases has also been observed in the locked grains. It has been observed that the

interface anisotropy has a more affective role in the formation of the inclined lamellae compared with an anisotropy of the

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

2022

View full text Add to dashboard Cite

show abstract

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

Khanna

Choudhury

2021

J Mater Sci

View full text Add to dashboard Cite

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.

show abstract

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

Mohagheghi

Şerefoğlu

2019

Metall Mater Trans A

View full text Add to dashboard Cite

Quasi-isotropic and locked grain growth dynamics in a three-phase eutectic system

Cited by 15 publications

References 18 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

Contact Info

Product

Resources

About