An atomistic investigation of branching mechanism during lamellar eutectic solidification

[Display omitted] Branching is a fundamental mechanism for lamellar spacing adjustment during eutectic solidification. However, the kinetic mechanism of branching is still unclear due to the lack of in-situ observations. In this work, utilizing the binary phase-field crystal model, we investigated t...

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Bibliographic Details
Published in:Computational materials science 2021-08, Vol.196, p.110536, Article 110536
Main Authors: Guo, Can, Kang, Chenrui, Xu, Chunjie, Wang, Jincheng
Format: Article
Language:English
Subjects:
Eutectic solidification
Heterogeneous nucleation
Lamellar branching
Phase-field crystal
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Summary:[Display omitted] Branching is a fundamental mechanism for lamellar spacing adjustment during eutectic solidification. However, the kinetic mechanism of branching is still unclear due to the lack of in-situ observations. In this work, utilizing the binary phase-field crystal model, we investigated the lamellar branching process during eutectic directional growth on an atomic scale. By visualizing the new lamella creation process, we found that new α lamellae form from heterogeneous nucleation at the front of the β/liquid interface. After further simulating eutectic solidification with different temperatures and lattice-mismatches, we found that the conditions that promote the heterogeneous nucleation could also stimulate lamellar branching. Conversely, if we suppress the heterogeneous nucleation process, lamellar branching will be hard to emerge, and the eutectic morphology will be a 2λ oscillating pattern.
ISSN:0927-0256
1879-0801
DOI:10.1016/j.commatsci.2021.110536