Three-Phase Eutectic Microstructures: Influence of Interfacial Energy Anisotropy and Solute Diffusivities (original) (raw)

Metallurgical and Materials Transactions A, 2021

Abstract

In this paper, we study three dimensional microstructural evolution in a symmetric ternary three-phase eutectic alloy using phase-field simulations under directional solidification conditions. While previous studies have explored the influence of volume fractions, difference in solid-liquid interfacial energies, velocity changes, etc. on the microstructural evolution, in this paper we deal with two unexplored fundamental aspects, namely the influence of solid-solid interfacial energy anisotropy as well as the disparity in the solute diffusivities in the liquid phase on three-phase microstructure formation. We begin by comparing the undercooling vs spacing variations for different steady state microstructures like the three-fibrous (hexagonal), brick-type and lamellar morphology under symmetric conditions and estimate the stability limits for each of the patterns for spacing variations. Thereafter, we investigate the transformation of the three-fibrous (hexagonal) arrangement to lowe...

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