Three-Phase Eutectic Microstructures: Influence of Interfacial Energy Anisotropy and Solute Diffusivities

Khanna, Sumeet; Choudhury, Abhik

doi:10.1007/s11661-021-06383-6

Cited by 4 publications

(5 citation statements)

References 64 publications

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“…Hence, this pattern is suggested to be one of the 3D steady-state microstructures of three-phase eutectic systems. The morphology and the arrangement of the phases in this system are different from the three-phase solidification microstructures observed in numerical and experimental studies [35][36][37][38][39][40] and other self-organized systems such as triblock copolymers. [41] The difference arises from the fact that in the studied system, two of the phases, namely c(Sn) and b(In), never come in contact, which results in having only two interphase boundaries instead of three.…”

Section: Discussioncontrasting

confidence: 81%

On the Effect of Interphase Boundary Energy Anisotropy on Morphologies: A New Type of Eutectic Grain Observed in a Three-Phase Eutectic System

Mohagheghi,

Şerefoğlu

2024

Metall Mater Trans A

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Eutectic microstructures are dramatically affected by the anisotropy in interphase boundary energy. Depending on this anisotropy function, different eutectic grains may grow simultaneously at the same experimental conditions. In all reported quasi-isotropic and anisotropic two-phase and three-phase eutectic grains in thin samples, lamellar morphology is observed and the microstructure is essentially two dimensional (2D), since the interphase boundaries are perpendicular to the sample walls. Using the β(In)–In2Bi–γ(Sn) system and real-time solidification experiments in thin samples, we introduce a unique and new type of anisotropic three-phase eutectic grain, entitled here as “Laminated Matrix with Rods (LMR).” In this grain, due to the anisotropy in In2Bi/γ(Sn) interphase boundary, the evolving phases, and hence, the microstructures observed through the two glass plates of the thin sample are completely different, despite the strong confinement effect. During rotating directional solidification (RDS) experiments, the morphology or the aspect ratio of all phases changes periodically and drastically. Specifically, In2Bi, β(In), and γ(Sn) phases evolve from all being lamellar perpendicular to the sample walls to the matrix, elongated/trapezoidal rods, and a lamella parallel to the sample walls, respectively. Our experimental results show that these morphological transitions are due to change in the interphase boundary orientation with respect to the growth direction. Graphical abstract

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Section: Discussioncontrasting

confidence: 81%

On the Effect of Interphase Boundary Energy Anisotropy on Morphologies: A New Type of Eutectic Grain Observed in a Three-Phase Eutectic System

Mohagheghi,

Şerefoğlu

2024

Metall Mater Trans A

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“…The function a c ( q) is describing the anisotropy in the interfacial energies between the phases. Following [43,44], an anisotropy formulation of the form:…”

Section: Phase-field Methodsmentioning

confidence: 99%

“…with qi as the Cartesian component of the unit normal vector q in the direction i, is used, to model the growth of a lamellar structure within the three-dimensional microstructures. Equation ( 3) generates a two-fold anisotropy in the solid-solid interface normals, that are perpendicular to the growth direction y [44]. This leads to an anisotropy of strength δ α β in the xz plane and ± δ α β 2 in the xy and yz planes [43], respectively.…”

Section: Phase-field Methodsmentioning

confidence: 99%

“…This leads to an anisotropy of strength δ α β in the xz plane and ± δ α β 2 in the xy and yz planes [43], respectively. Using this most simple anisotropy formulation proposed in [44], the main focus of this work remains on the investigation and validation of the generated quaternary model for NiAl-31Cr-3Mo instead of an intense investigation of the anisotropic behavior in the system. For the same reason, the influence of the elastic strain energy between two phases and the influence of the growth orientations on the phase morphology will not be considered in this work.…”

Section: Phase-field Methodsmentioning

confidence: 99%

“…Also first pre-studies employing phase-field simulations indicate the growth of a merely fibrous microstructure for the composition NiAl-31Cr-3Mo. Following [43,44], the growth of a lamellar microstructure could be attributed to the anisotropic properties of the surface energies. This is another point which makes the directional solidification process of NiAl-31Cr-3Mo particularly interesting for a simulation study with the phase-field method.…”

Section: The Quaternary System Nial-(crmo)mentioning

confidence: 99%

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Phase-Field Simulation of the Microstructure Evolution in the Eutectic Alloy NiAl-31Cr-3Mo

et al. 2023

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The directionally solidified eutectic alloy NiAl-(Cr,Mo) is a promising candidate for structural applications at high temperatures, due to its increased creep resistance compared to its single phase B2ordered NiAl counterpart. This system yields an eutectic trough connecting the invariant reactions of the ternary alloys NiAl-Cr and NiAl-Mo. During directional solidification (DS) along this trough the evolved microstructures of the two-phase eutectic is changing from fibrous to lamellar and back to fibrous morphology while increasing and decreasing the amounts of Mo and Cr, respectively. To investigate these effects in the morphology, the phase-field method has proven to be predestined in the last decades. However, as the modeling of quaternary systems is challenging for the simulation with a grand potential based phase-field model, the focus of this work is on the generation of a material model for one defined compound namely NiAl-31Cr-3Mo. The modeling is validated by investigating the microstructure evolution in two- and three-dimensional simulations of the DS process for two different growth velocities and by investigating their undercooling spacing relationships. The evolving microstructures obtained from three-dimensional large-scale simulations are presented and validated with corresponding micrographs from scanning electron microscopy (SEM) of directionally solidified samples with the same growth velocities. The simulation results show the theoretically expected behaviors and are in qualitative and quantitative accordance with DS experiments. The study of NiAl-31Cr-3Mo serves as the basis for a comprehensive data-driven analysis of microstructure properties and system quantities of the entire quaternary material NiAl-(Cr,Mo). With this, an accelerated design of advanced materials is promoted.

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Impact of crystal orientation relationship on microstructure evolution in Al-Ag-Cu ternary eutectic

Frieß

Rayling

Hecht

et al. 2022

Journal of Crystal Growth

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Three-Phase Eutectic Microstructures: Influence of Interfacial Energy Anisotropy and Solute Diffusivities

Cited by 4 publications

References 64 publications

On the Effect of Interphase Boundary Energy Anisotropy on Morphologies: A New Type of Eutectic Grain Observed in a Three-Phase Eutectic System

On the Effect of Interphase Boundary Energy Anisotropy on Morphologies: A New Type of Eutectic Grain Observed in a Three-Phase Eutectic System

Phase-Field Simulation of the Microstructure Evolution in the Eutectic Alloy NiAl-31Cr-3Mo

Impact of crystal orientation relationship on microstructure evolution in Al-Ag-Cu ternary eutectic

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